FEATURES Pin-Compatible Functionally Upwards-Compatible with Shar

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FEATURES Pin-Compatible Functionally Upwards-Compatible with Shar

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LH543611/21
FEATURES Pin-Compatible Functionally
Upwards-Compatible with Sharp LH5420 LH543601, Deeper Expanded Control Register that Fully Readable well Writable Fast Cycle Times: 18/20/25/30/35 Improved Input Setup Flag Timing 36-bit FIFO Buffers (LH543611) 1024 36-bit FIFO Buffers (LH543621) Full 36-bit Word Width Selectable 36/18/9-bit Word Width Port Selection Changed Without Resetting BiFIFO Programmable Byte-Order Reversal `Big-Endian Little-Endian Conversion' Independently-Synchronized (`Fully-Asynchronous') Operation Port Port `Synchronous' Enable-Plus-Clock Control Both Ports R/W, Enable, Request, Address Control Inputs Sampled Rising Clock Edge Synchronous Request/Acknowledge `Handshake' Capability; Optional Device Comes Into Known Default State Reset; Programming Allowed, Required Asynchronous Output Enables Five Status Flags Port: Full, Almost-Full, Half-Full, Almost-Empty, Empty Flags Independently Programmable Either Synchronous Asynchronous Operation Almost-Full Flag Almost-Empty Flag Have Programmable Offsets Mailbox Registers with Synchronized Flags Data-Bypass Function Data-Retransmit Function Automatic Byte Parity Checking with Programmable Parity Flag Latch Programmable Byte Parity Generation Programmable Byte, Half-Word, Full-Word Oriented Parity Operations mA-IOL High-Drive Three-State Outputs with Built-In Series Resistor TTL/CMOS-Compatible Space-Saving PQFP TQFP Packages PQFP Package Conversion
1024 Synchronous Bidirectional FIFO
FUNCTIONAL DESCRIPTION
LH543611 LH543621 contain FIFO buffers, FIFO FIFO These operate parallel, opposite directions, bidirectional data buffering. FIFO FIFO each organized 1024 bits. LH543611 LH543621 ideal either wide unidirectional applications bidirectional data applications; component count board area reduced. LH543611 LH543621 have 36-bit ports, Port Port Each port port-synchronous clock, ports operate asynchronously relative each other. Data flow initiated port rising edge appropriate clock; gated corresponding edge-sampled enable, request, read/write control signals. maximum operating frequency, clock duty cycle vary from 60%. lower frequencies, clock waveform quite asymmetric, long minimum pulse-width conditions clock-HIGH clock-LOW remain satisfied; LH543611 LH543621 fully-static parts. Conceptually, port clocks freerunning, periodic `clock' waveforms, used control other signals which edge-sensitive. However, there actually absolute requirement that these `clock' waveforms must periodic. `asynchronous' mode operation possible, both directions, independently, appropriate enable request inputs continuously asserted, enough aperiodic `clock' pulses suitable duration generated external logic cause necessary actions occur. synchronous request/acknowledge handshake facility provided each port FIFO data access. This request/ acknowledge handshake resolves FIFO full empty boundary conditions, when ports operated asynchronously relative each other. FIFO status flags monitor extent which each FIFO buffer been filled. Full, Almost-Full, Half-Full, Almost-Empty, Empty flags included each FIFO. Each these flags independently programmed either synchronous asynchronous operation. Also, Almost-Full Almost-Empty flags programmable over entire FIFO depth, automatically initialized eight locations from respective FIFO boundariesat reset. data block (LH543611) 1024 (LH543621) fewer words retransmitted desired number times.
BOLD Additions over 5420/3601 feature set. Ordering nformation.
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LH543611/21
1024 BiFIFOs change; except that change made full-word boundary, least dummy word must passed through Port before actual data words transmitted. Byte Parity Check Flag each port monitors data integrity. Control-Register (zero) selects parity mode, oddor even. This itialized odddata parity reset; reprogrammed even parity, back again parity, desired. parity flags programmed operate either latched mode flowthrough mode. parity checking performed over 36-bit full-words, over 18-bit half-words, over 9-bit single bytes. Parity generation selected well parity checking, likewise performed over full-words half-words single bytes. case, parity proper mode generated over least-significant eight bits byte, then stored most-significant position byte passes through LH543611/21, overwriting whatever esent that position previously.
FUNCTIONAL DESCRIPTION (cont'd)
mailbox registers provide separate path passing control words status words between ports. Each mailbox New-Mail-Alert Flag, which synchronized reading port's clock. This mailbox function facilitates synchronization data transfers between asynchronous systems. Data-bypass mode allows Port directly transfer data from Port reset. this mode, device acts registered transceiver under control Port instance, master processor Port data bypass feature send receive initialization configuration information directly, from peripheral device Port during system startup. word-width-select option provided Port 36-bit, 18-bit, 9-bit data access. This feature allows word-width matching between Port Port with additional logic needed. also ensures maximum utilization bandwidths. Subject meeting timing requirements, word-width selection changed time during operation LH543611 LH543621, without need either reset operation passing dummy words through Port immediately after
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1024 BiFIFOs
LH543611/21
CONNECTIONS
VIEW
D11A D12A D13A D14A VSSO D15A D16A D17A R/WA REQA ACKA MBF2 D18A D19A VSSO D20A D21A D22A D23A
VCCO D10A VSSO VCCO VSSO VSSO VCCO VSSO D10B D11B VCCO
CHAMFERED EDGE
VCCO D24A D25A D26A VSSO D27A D28A D29A VCCO D30A D31A D32A VSSO D33A D34A D35A D35B D34B VSSO D33B D32B D31B VCCO D30B D29B D28B VSSO D27B D26B D25B VCCO
D12B D13B D14B D15B VSSO D16B D17B MBF1 ACKB REQB R/WB D18B D19B D20B VSSO D21B D22B D23B D24B
543611-1
Figure Connections 132-Pin PQFP Package (Top View)
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LH543611/21
1024 BiFIFOs
144-PIN TQFP
VSSO D23A D22A D21A D20A VSSO D19A D18A MBF2 ACKA REQA R/WA D17A D16A D15A VSSO D14A D13A D12A D11A VSSO
VCCO VCCO D24A D25A D26A VSSO D27A D28A D29A VCCO D30A D31A D32A VSSO D33A D34A D35A VSSO D35B D34B VSSO D33B D32B D31B VCCO D30B D29B D28B VSSO D27B D26B D25B VCCO VCCO
VIEW
VCCO VCCO D10A VSSO VCCO VSSO VSSO VSSO VCCO VSSO D10B D11B VCCO VCCO
VSSO D24B D23B D22B D21B VSSO D20B D19B D18B R/WB REQB ACKB MBF1 D17B D16B VSSO D15B D14B D13B D12B VSSO
543611-2
Figure Connections 144-Pin TQFP Package (Top View)
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1024 BiFIFOs
LH543611/21
LIST
SIGNAL NAME PQFP TQFP
D17A D16A D15A D14A D13A D12A D11A D10A D10B D11B D12B D13B D14B D15B
SIGNAL NAME
PQFP
TQFP
ACKB REQB R/WB D18B D19B D20B D21B D22B D23B D24B D25B D26B D27B D28B D29B D30B D31B D32B D33B D34B D35B D35A D34A D33A D32A D31A D30A D29A
SIGNAL NAME
PQFP
TQFP
D16B D17B MBF1
NOTE: PINS
COMMENTS
D28A D27A D26A D25A D24A D23A D22A
D21A D20A D19A D18A MBF2 ACKA REQA R/WA VSSO VSSO VCCO VCCO VSSO VCCO VSSO VSSO VSSO VCCO VSSO VCCO VCCO VSSO VSSO VSSO VSSO VCCO VCCO VSSO VCCO VSSO VSSO VSSO VCCO VSSO VCCO VCCO VSSO VSSO
PINS
COMMENTS
VCCO
Supply internal logic. Connected each other. Supply output drivers only. Connected each other.
VSSO
Supply internal logic. Connected each other. Supply output drivers only. Connected each other.
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LH543611/21
1024 BiFIFOs
WRITE PORT
FIFO
READ PORT
READ
FIFO
WRITE
PORT CONTROL
PORT CONTROL
543611-3
Figure Simplified LH543611/21 Block Diagram
BYPASS MBF1 MBF2 MAILBOX REGISTER RESET LOGIC MAILBOX REGISTER
COMMAND PORT REGISTER
COMMAND PORT REGISTER
FIFO MEMORY ARRAY 1024 R/WA REQA ACKA FIXED PROGRAMMABLE STATUS FLAGS PORT SYNCHRONOUS CONTROL LOGIC PORT SYNCHRONOUS CONTROL LOGIC R/WB REQB ACKB
WRITE POINTER
READ POINTER
FIXED PROGRAMMABLE STATUS FLAGS
D35A
READ POINTER PORT
WRITE POINTER PORT
D35B WS0,
FIFO MEMORY ARRAY 1024 PARITY CHECKING GENERATION RESOURCE REGISTERS PARITY CHECKING GENERATION
543611-4
Figure Detailed LH543611/21 Block Diagram
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1024 BiFIFOs
LH543611/21
DESCRIPTIONS
TYPE DESCRIPTION
GENERAL VCC, Power, Ground Reset PORT R/WA A0A, A1A, REQA D35A MBF2 ACKA R/WB WS0, REQB D35B MBF1 ACKB I/O/Z I/O/Z Port Free-Running Clock Port Edge-Sampled Read/Write Control Port Edge-Sampled Enable Port Edge-Sampled Address Pins Port Level-Sensitive Output Enable Port Request/Enable FIFO Retransmit Port Bidirectional Data FIFO Full Flag (Write Boundary) FIFO Programmable Almost-Full Flag (Write Boundary) FIFO Half-Full Flag FIFO Programmable Almost-Empty Flag (Read Boundary) FIFO Empty Flag (Read Boundary) New-Mail-Alert Flag Mailbox Port Parity Flag Port Acknowledge PORT Port Free-Running Clock Port Edge-Sampled Read/Write Control Port Edge-Sampled Enable Port Edge-Sampled Address Port Level-Sensitive Output Enable Port Word-Width Select Port Request/Enable FIFO Retransmit Port Bidirectional Data FIFO Full Flag (Write Boundary) FIFO Programmable Almost-Full Flag (Write Boundary) FIFO Half-Full Flag FIFO Programmable Almost-Empty Flag (Read Boundary) FIFO Empty Flag (Read Boundary) New-Mail-Alert Flag Mailbox Port Parity Flag Port Acknowledge
NOTE: Input, Output, High-Impedance, Power Voltage Level
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ABSOLUTE MAXIMUM RATINGS
PARAMETER RATING
Supply Voltage Potential Signal Voltage Potential Output Current Storage Temperature Range Power Dissipation (Package Limit)
-0.5 -0.5 -65oC 150oC Watts (Quad Flat Pack)
NOTES: Stresses greater than those listed under `Absolute Maximum Ratings' cause permanent damage device. This stress rating transient conditions only. Functional operation device these other conditions outside those indicated `Operating Range' this specification implied. Exposure absolute maximum rating conditions extended periods affect reliability. Outputs should shorted more than seconds. more than output should shorted time. Negative undershoot amplitude permitted once cycle.
OPERATING RANGE
SYMBOL PARAMETER UNIT
FROM PORT INTERNAL DATA CONTROL GATE)
Temperature, Ambient Supply Voltage Supply Voltage Logic Input Voltage Logic HIGH Input Voltage
-0.5
DnA/B FLAG)
ASSOCIATED INPUT BUFFER (SEE NOTE) NOTE: Output-only pins have associated input buffer.
543611-13
NOTE: Negative undershoot amplitude permitted once cycle.
Figure Structure Series-Resistor Input/Output Interface
ELECTRICAL CHARACTERISTICS (OVER OPERATING RANGE)
SYMBOL PARAMETER TEST CONDITIONS UNIT
ICC2 ICC3 ICC4
Input Leakage Current Leakage Current Logic Output Voltage Logic HIGH Output Voltage Average Supply Current Average Standby Supply Current Power-Down Supply Current Power-Down Supply Current
VIH, VOUT -8.0 Measured Inputs VIHMIN (Clocks idle) Inputs (Clocks idle) Inputs (Clocks running max)
0.002
NOTES: ICC2, CC3, dependent upon actual output loading, ICC4 also dependent cycle rates. Specified values with outputs open (for pF); and, CC4, operating minimum cycle times. (MAX.) using "worst case" data pattern. (TYP.) using "average" data pattern. (TYP.) using 25°C.
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LH543611/21
TEST CONDITIONS
PARAMETER RATING
Input Pulse Levels Input Rise Fall Times (10% 90%) Output Reference Levels Input Timing Reference Levels Output Load, Timing Tests
Figure
DEVICE UNDER TEST
CAPACITANCE
PARAMETER RATING
INCLUDES SCOPE CAPACITANCES
Figure Output Load Circuit
543611-14
(Input Capacitance) COUT (Output Capacitance)
NOTES: Sample tested only. Capacitances maximum values 25oC, measured MHz, with
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ELECTRICAL CHARACTERISTICS (VCC +10% 70°C)
SYMBOL DESCRIPTION UNITS
tRWS tRWH tRQS tRQH tWSS tWSH tACK tMBF tRSS tRSH tFRL tFWL tSKEW1 tSKEW2
Clock Cycle Frequency Clock Cycle Time Clock HIGH Time Clock Time Data Setup Time Data Hold Time Enable Setup Time Enable Hold Time Read/Write Setup Time Read/Write Hold Time Request Setup Time Request Hold Time Address Setup Time Address Hold Time Width Select Setup Time Width Select Hold Time Data Output Access Time Acknowledge Access Time Output Hold Time Output Enable Time, Low-Z Output Disable Time, HIGH High-Z Clock Flag Valid Clock Flag Valid Clock Flag Valid Clock Flag Valid Clock Flag Valid Clock Flag Valid Data Parity Flag Valid Reset/Retransmit Pulse Width Reset/Retransmit Setup Time Reset/Retransmit Hold Time Reset Flag Valid First Read Latency First Write Latency Bypass Data Setup Bypass Data Hold Bypass Data Access Skew Time Read-to-Write Clock Skew Time Write-to-Read Clock
14.5 14.5 15.5
14.5 14.5
13.8 14.5 14.5 14.5
10.5 10.5 10.5 10.5
28.5
NOTES: Timing measurements performed Condition' levels. tAS, address setup times hold times need only satisfied clock edges which occur while corresponding enables being asserted. Values guaranteed design; currently production tested. Measured with Parity Flag operating flowthrough mode. When enabled; tRSS RSH. tRSS and/or tRSH need unless rising edge occurs while being asserted, else rising edge occurs while being asserted. tFRL minimum first-write-to-first-read delay, following empty condition, which required assure valid read data. tFWL minimum first-read-to-first-write delay, following full condition, which required assure successful writing data.
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1024 BiFIFOs
LH543611/21 Table Resource-Register Addresses
RESOURCE PORT
OPERATIONAL DESCRIPTION
Reset device reset whenever asynchronous Reset (RS) input taken LOW, least rising edge falling edge both occur while LOW. reset operation required after power-up, before first write operation occur. LH543611/21 fully ready operation after being reset. device programming required default states described below acceptable. reset operation initializes read-address write-address pointers FIFO FIFO those FIFO's first physical memory locations. respective outputs enabled, initial contents these first locations appear outputs. FIFO mailbox status flags updated indicate empty condition. addition, programmable-status-flag offset values initialized eight. Thus, AE1/AE2 flags asserted within eight locations empty condition, AF1/AF2 flags likewise asserted within eight locations full condition, FIFO #1/FIFO respectively. Bypass Operation During reset (whenever LOW) device acts registered transceiver, bypassing internal FIFO memories. Port acts master port. write read operation Port during reset transfers data directly from Port Port considered slave, cannot perform write read operations independently during reset. direction bypass data transmission determined R/WA control input, which does overridden input. Here, `write' operation means passing data from Port Port `read' operation means passing data from Port Port bypass capability used pass initialization configuration data directly between master processor peripheral device during reset. Address Modes Address pins select device resource accessed each port. Port three resource-register-select inputs, A0A, A1A, A2A, which select between FIFO access, mailbox-register access, control-register access, programmable flag-offset-value-register access. Port single address input, A0B, select between FIFO access mailbox-register access. status resource-register-select inputs sampled rising edge enabled clock (CKA Resource-register select-input address definitions summarized Table
FIFO Mailbox AF2, AE2, AF1, Flag Offsets Register (36-Bit Mode) Control Register FlagSynchronization Parity Operating Mode Flag Offset Register Flag Offset Register Flag Offset Register Flag Offset Register
RESOURCE PORT
FIFO Mailbox
Control Register eighteen Control-Register bits govern synchronization mode fullness-status flags each port, choice even parity both ports, enabling parity generation data flow each port, optional latching behavior parity-error flags each port, selection full-word half-word single-byte field parity checking. reset operation initializes LH543611/21 Control Register LH5420/LH543601-compatible operation, reprogrammed will time during LH543611/21 operation. FIFO Write Port writes FIFO Port writes FIFO write operation initiated rising edge clock (CKA CKB) whenever: appropriate enable (ENA held HIGH; appropriate request (REQA REQB) held HIGH; appropriate Read/Write control (R/WA R/WB) held LOW; FIFO address selected address inputs (A2A A0B); prescribed setup times hold times observed these signals. Setup times hold times must also observed data-bus pins (D0A D35A D35B). Normally, appropriate Output Enable signal (OEA OEB) HIGH, disable outputs that port, that data word present from external sources gets stored. However, `loopback' mode operation also possible, which data word supplied outputs internal FIFO `turned around' port read back into other FIFO. this mode, outputs port disabled. remain within specification timing parameters, Clock Cycle Frequency must reduced slightly below value
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LH543611/21
1024 BiFIFOs Programmable Status Flags Four programmable FIFO status flags provided, Almost-Full (AF1 AF2), AlmostEmpty (AE1 AE2). Thus, each port programmable flags monitor status internal FIFO buffer memories. offset values these flags initialized eight locations from respective FIFO boundaries during reset, reprogrammed over entire FIFO depth. Almost-Full Flag asserted following first subsequent rising clock edge after write operation which partially filled FIFO `almost-full' offset point. Almost-Full Flag deasserted following first subsequent falling clock edge after read operation which partially emptied FIFO down past `almost-full' offset point. Almost-Empty Flag asserted following first subsequent rising clock edge after read operation which partially emptied FIFO down `almost-empty' offset point. Almost-Empty Flag deasserted following first subsequent falling clock edge after write operation which partially filled FIFO past `almost-empty' offset point. Flag offsets written read through Port data bus. four programmable FIFO status flag offsets simultaneously through single 36-bit status word; each programmable flag offset individually, through four nine-bit (LH543611) ten-bit (LH543621) status words. Tables illustrate data format flag-programming words. Note that when four offsets simultaneously LH543621, settings limited magnitudes expressible nine bits; larger offset values, individual setting option must used. (See Figure 3b.) Also, Tables define meaning each five flags, both dedicated flags programmable flags, LH543611 LH543621 respectively. NOTE: Control inputs which affect computation flag values port generally should change while clock that port HIGH, since some updating flag values takes place falling edge clock. Mailbox Operation mailbox registers provided passing system hardware software control/status words between ports. Each port read mailbox write other port's mailbox. Mailbox access performed rising edge controlling FIFO's clock, with mailbox address selected enable HIGH. That writing Mailbox Register reading from Mailbox Register synchronized writing Mailbox Register reading from Mailbox Register synchronized CKB. R/WA/B OEA/B pins control direction availability mailbox-register accesses. Each mailbox register New-M ail-Alert Flag (MBF1
OPERATIONAL DESCRIPTION (cont'd)
which otherwise would permissible that speed grade LH543611/21. When FIFO full condition reached, write operations locked out. Following first read operation from full FIFO, another memory location freed corresponding Full Flag deasserted HIGH). first write operation should begin earlier than First Write Latency (tFWL) after first read operation from full FIFO, ensure that correct read data retrieved. (See Figures 34.) FIFO Read Port reads from FIFO Port reads from FIFO read operation initiated rising edge clock (CKA CKB) whenever: appropriate enable held HIGH; appropriate request (REQA held HIGH; appropriate Read/Write control (R/WA R/WB) held HIGH; FIFO address selected address inputs (A2A A0B); prescribed setup times hold times observed these signals. Read data becomes valid data-bus pins (D0A D35A D35B) time after rising clock (CKA edge, provided that data outputs enabled. assertive-LOW, asynchronous, Output Enable control input signals. Their effect only enable disable output drivers respective port. Disabling outputs does disable read operation; data transmitted corresponding output register will remain available later, when outputs again enabled, unless subsequently overwritten. When empty condition reached, read operations locked until valid write operation(s) loaded additional data into FIFO. Following first write empty FIFO, corresponding empty flag (EF) will deasserted (HIGH). first read operation should begin earlier than First Read Latency (tFRL) after first write empty FIFO, ensure that correct read data words retrieved. (See Figures 32.) Dedicated FIFO Status Flags dedicated FIFO status flags included Full (FF1 FF2), Half-Full (HF1 HF2), Empty (EF1 EF2). FF1, HF1, indicate status FIFO FF2, HF2, indicate status FIFO Full Flag asserted following first subsequent rising clock edge write operation which fills FIFO. Full Flag deasserted following first subsequent falling clock edge read operation full FIFO. Half-Full Flag updated following first subsequent rising clock edge read write operation FIFO which changes `half-full' status. Empty Flag asserted following first subsequent rising clock edge read operation which empties FIFO. Empty Flag deasserted following falling clock edge write operation empty FIFO. Page
1024 BiFIFOs
LH543611/21 REQ/ACK handshake used, then REQA/B input used second enable input, possible minor loss maximum operating speed. this case, ACKA/B output ignored. WARNING: Whether REQ/ACK handshake being used, REQA/B input port must asserted that port function FIFO, mailbox, databypass operation. Data Retransmit retransmit operation resets read-address pointer corresponding FIFO back first FIFO physical memory location, that data reread. write pointer affected. status flags updated; block 1024 data words, which previously been written into read from FIFO, retrieved. block retransmitted bounded first FIFO memory location, FIFO memory location addressed write pointer. FIFO retransmit initiated strobing LOW. FIFO retransmit initiated strobing LOW. Read write operations FIFO should stopped while corresponding Retransmit signal being asserted. Parity Checking Parity Check Flags, PFB, asserted (LOW) whenever there parity error data word present Port data Port data respectively. inputs parity-evaluation logic come directly (via isolation transistors) from data-bus bonding pads, each case. Thus, provide parity-error indications whatever 36-bit words present Port Port respectively, regardless whether those words originated within LH543611/21 external system. four bytes 36-bit data word grouped D17, D26, D35. parity each nine-bit byte individually checked, four single-bit parity indications logically ORed inverted produce Parity-Flag output. Parity Policy (Control-Register HIGH, then parity Port will computed over field defined Word-Width Selection control inputs WS1, then full-words, half-words, single bytes. Otherwise, parity will computed over full-words regardless setting WS1. Parity checking initialized parity reset, reprogrammed even parity parity during operation. Control-Register (zero) selects parity mode, even. (See Tables Figure 10.)
OPERATIONAL DESCRIPTION (cont'd)
MBF2), which synchronized reading port's clock. These New-Mail-Alert Flags status indicators only, cannot inhibit mailbox-register read write operations. Request Acknowledge Handshake synchronous request-acknowledge handshake feature provided each port, perform boundary synchronization between asynchronously-operated ports. this feature optional. When used, Request input (REQA/B) sampled rising clock edge. With REQA/B HIGH, R/WA/B determines whether FIFO read operation FIFO write operation being requested. Acknowledge output (ACKA/B) updated during following clock cycle(s). ACKA/B meets setup hold time requirements Enable input Therefore, ACKA/B tied back enable input directly gate FIFO accesses, slight decrease maximum operating frequency. assertion ACKA/B signifies that REQA/B asserted. However, ACKA/B does depend logically A/B; thus assertion ACKA/B does prove that FIFO write access FIFO read access actually took place. While REQA/B being held HIGH, ACKA/B considered synchronous, predictive boundary flag. That ACKA/B acts synchronized predictor Almost-Full Flag write operations, synchronized predictor AlmostEmpty Flag read operations. Outside `almost-full' region `almost-empty' region, ACKA/B remains continuously HIGH whenever REQA/B held continuously HIGH. Within `almostfull' region `almost-empty' region, ACKA/B occurs only every third cycle, prevent overrun FIFO's actual full empty boundaries ensure that tFWL (first write latency) tFRL (first read latency) specifications satisfied before ACKA/B received. `almost-full region' defined `that region, where Almost-Full Flag being asserted'; `almostempty region' `that region, where Almost-Empty Flag being asserted.' Thus, extent these `almost' regions depends system programmedthe offset values Almost-Full Flags AlmostEmpty Flags. system programmed them, then these offset values remain their default values, eight each case. write attempt unsuccessful because corresponding FIFO full, read attempt unsuccessful because corresponding FIFO empty, ACKA/B asserted response REQA/B.
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LH543611/21 nine bits each byte treated alike parity logic. byte parity over nine bits compared with Parity Mode Control Register, generate byte-parity-error indication. Then, four byte-parityerror signals NORed together, compute assertive-LOW parity-flag value. This value pass through output flowthrough basis, latched, according setting Control-Register latching that port (bit 11). (See Figure example parity checking.) Parity Generation Unlike parity checking, parity generation port operates only when explicitly invoked setting corresponding Control-Register that port (bit HIGH. presumed division words into bytes still remains same parity checking. However, longer true that nine bits each byte treated alike; now, most-significant each byte explicitly designated parity that byte. parity-generation process records value into that position each byte passing through port. (See Figure example parity generation.) Parity Policy bit(Control Register 09), HIGH, parity Port will generated full-words, halfwords, single bytes according setting Word-Width Selection control inputs WS1. Otherwise, parity will generated full-words regardless setting WS1. parity bits generated even odd, according setting Control-Register which same that governs their interpretation during parity checking. Word-Width Selection Byte-Order Reversal Port word width data access Port selected control inputs. both tied HIGH 36-bit access; they both tied single-byte access. double-byte access, tied LOW; tied HIGH straight-through transmission 36-bit words, tied on-the-fly byte-order reversal four bytes word (`big-endian little-endian conversion'). (See Table 2b.) single-byte-access double-byte-access modes, FIFO write operations Port essentially pack data form 36-bit words, viewed from Port Similarly, singlebyte double-byte FIFO read operations Port essentially unpack 36-bit words through series shift operations. FIFO status flags updated following last access which forms complete 36-bit transfer.
1024 BiFIFOs Since values each status flag computed logic directly associated with FIFO-memory arrays, logic associated with Port flag values reflect array fullness situation terms complete 36-bit words, terms bytes double bytes. However, there such restriction switching from writing reading, from reading writing, Port long tRWS, tDS, satisfied, R/WB change state after single-byte double-byte access, only after full 36-bit-word access. Also, changed between fullwords during FIFO operation, without need reset operation, passing dummy words through advance real data. such change made other than full-word boundary, however, least dummy word should used. Also, word-width-matching feature continues operate properly `loopback' mode. Note that programmable word-width-matching feature only supported FIFO accesses. Mailbox Data Bypass operations support word-width matching between Port Port Tables Figures summarize word-width selection Port Table Port Word-Width Selection
PORT DATA WIDTH
36-Bit 36-Bit with Byte-Order Reversal 18-Bit 9-Bit
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1024 BiFIFOs
LH543611/21
PARITY CHECKING
DA/B35 DA/B0
Output word: parity: Even parity:
100111100
000111100
100111000
000111000
Parity Bytes 0110; Byte Parity Error) Parity Bytes 1001; Byte Parity Error) PARITY GENERATION
DA/B DA/B
Input word: Output, parity: Output, even parity:
100111100 100111100 000111100
000111100 100111100 000111100
100111000 000111000 100111000
000111000 000111000 100111000
Figure Example Parity Checking Generation
Table Funneling/Defunneling
(HH) DA[35:0] DB[35:0] (HL) DB[35:0] (LH) DB[35:18] DB[17:0] (LL) DB[35:9] DB[8:0]
NOTE: represent data bytes.
INPUT
BYTE BYTE
LH543611/21 DA35 DB35
OUTPUT: WS[1:0]= (HL)
BYTE BYTE
Example: Intel, DEC, etc.
DA27
BYTE BYTE
DB27 DB26
BYTE BYTE
DA26
DA18
BYTE BYTE
DB18 DB17
BYTE BYTE
DA17
BYTE BYTE
BYTE BYTE
543611-52
Figure Example 36-to-36 Byte Order Reversal
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Example: IBM, Motorala, etc.
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1024 BiFIFOs
PORT WORD-WIDTH SELECTION
36-Bit Data Stream D35A D18A Bits 18-35 (2nd Halfword)
18-Bit Data Streams D35B Halfword, then Halfword D18B
Bits 18-35 alfw
PORT
D17A Bits 0-17 (1st Halfword)
ord) Bits Halfw
PORT
D17B
543611-15
Halfword, then Halfword
Figure 36-to-18 Funneling Through FIFO
36-Bit Data Stream D35A D27A Bits 27-35 (4th Byte)
9-Bit Data Streams D35B D27B Byte, then Byte, then Byte, then Byte
D26A D18A
Bits 18-26 (3rd Byte)
D26B D18B Byte, then Byte, then Byte, then Byte
PORT
D17A Bits 9-17 (2nd Byte) D17B
PORT
Byte, then Byte, then Byte, then Byte
Bits (1st Byte)
543611-16
Byte, then Byte, then Byte, then Byte
Figure 36-to-9 Funneling Through FIFO
NOTES: heavy black borders register segments indicate main data path, suitable most applications. Alternate paths feature different ordering bytes within word, Port funneling process does change ordering bits within byte. Halfwords (Figure bytes (Figure transferred parallel form from Port Port
word-width setting changed during system operation; however, clock intervals should allowed these signals settle, before again attempting read D35B. Also, incomplete data words occur, when word width changed from shorter longer inappropriate point data block passing through FIFO.
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LH543611/21
PORT WORD-WIDTH SELECTION
36-Bit Data Stream D35A D18A
18-Bit Data Stream D35B
Bits 18-35 alfw
D18B
PORT
D17A Bits 0-17 (1st Halfword) D17B
PORT
Halfword, then Halfword
543611-17
Figure 18-to-36 Defunneling Through FIFO
36-Bit Data Stream D35A D27A Bits 27-35 (4th Byte)
9-Bit Data Stream D35B D27B
D26A D18A Bits 18-26 (3rd Byte)
D26B
D18B
PORT
D17A Bits 9-17 (2nd Byte) D17B
PORT
Bits (1st Byte)
Byte, then Byte, then Byte, then Byte
543611-18
Figure 9-to-36 Defunneling Through FIFO
NOTES: heavy black borders register segments indicate only data paths used. other byte segments Port participate data path during defunneling. defunneling process does change ordering bits within byte. Halfwords (Figure bytes (Figure transferred parallel form from Port Port
word-width setting changed during system operation; however, clock intervals should allowed these signals settle, before again attempting send data. Also, incomplete data words occur, when word width changed from shorter longer inappropriate point data block passing through FIFO.
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LH543611/21
1024 BiFIFOs Table LH543611 Resource-Register Programming
RESOURCEREGISTER ADDRESS
RESOURCE-REGISTER CONTENTS
NORMAL FIFO OPERATION D35A
MAILBOX D35A
AF2, AE2, AF1, FLAG REGISTER (36-BIT MODE) D35A D27A D26A D18A D17A
Offset
Offset
Offset
Offset
CONTROL REGISTER: FLAG SYNCHRONIZATION, PARITY CONFIGURATION D35A D18A D17A
Port Control
Port Control
9-BIT FLAG OFFSET REGISTER D35A
Offset
9-BIT FLAG OFFSET REGISTER D35A
Offset
9-BIT FLAG OFFSET REGISTER D35A
9-BIT FLAG OFFSET REGISTER D35A
Offset
Offset
NOTES: four programmable-flag-offset values initialized eight during reset operation. Parity Mode: parity HIGH; even parity LOW. parity mode initialized during reset operation. Tables Figure detailed format Control Register word.
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1024 BiFIFOs Table LH543621 Resource-Register Programming
RESOURCEREGISTER ADDRESS NORMAL FIFO OPERATION D35A
LH543611/21
RESOURCE-REGISTER CONTENTS
MAILBOX D35A
AF2, AE2, AF1, FLAG REGISTER (36-BIT MODE)4 D35A D27A D26A D18A D17A
Offset
Offset
Offset
Offset
CONTROL REGISTER: FLAG SYNCHRONIZATION, PARITY CONFIGURATION D35A D18A D17A
Port Control
Port Control
10-BIT FLAG OFFSET REGISTER D35A D10A
Offset
10-BIT FLAG OFFSET REGISTER D35A D10A
Offset
10-BIT FLAG OFFSET REGISTER D35A D10A
10-BIT FLAG OFFSET REGISTER D35A
Offset
D10A
Offset
NOTES: four programmable-flag-offset values initialized eight during reset operation. Parity Mode: parity HIGH; even parity LOW. parity mode initialized during reset operation. Tables Figure detailed format Control Register word. 36-bit Flag Register Control word, with only only bits program flag offset: Offset limited value 511. greater value desired, individual flag offset register programming required.
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LH543611/21 Table LH543611 Flag Definition Table
VALID READ CYCLES REMAINING FLAG FLAG FLAG HIGH
1024 BiFIFOs
VALID WRITE CYCLES REMAINING FLAG FLAG HIGH
512-p
511-p
512-q
511-q
NOTE: Programmable-Almost-Empty Offset value. (Default value: Programmable-Almost-Full Offset value. (Default value:
Table LH543621 Flag Definition Table
VALID READ CYCLES REMAINING FLAG FLAG FLAG HIGH VALID WRITE CYCLES REMAINING FLAG FLAG HIGH
1024 1024-p
1024 1024 1024
1023 1023-p 1024 1024
1024-q 1024
1024 1024
1024 1024 1024 1023-q 1023
NOTE: Programmable-Almost-Empty Offset value. (Default value: Programmable-Almost-Full Offset value. (Default value:
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1024 BiFIFOs Table Control-Register Format
PORT COMMAND REGISTER BITS CODE VALUE AFTER RESET FLAG AFFECTED, DESCRIPTION NOTES
LH543611/21
PFA,
EVEN parity effect. parity effect. Disable Port parity generation. Enable Port parity generation. Port parity-error flag operates `flowthrough.' Port parity-error flag latched CKA. CKA, reset CKB. reset CKA. CKA, reset CKB. reset CKA. CKA, reset CKB. reset CKB. reset CKA. CKA, reset CKB. reset CKA. CKA, reset CKB. reset CKA. Parity check computed over four bytes each word. Parity check computed over half-word single-byte according setting. Disable Port parity generation. Enable Port parity generation. Port parity-error flag operates `flowthrough.' Port parity-error flag latched CKB. CKB, reset CKA. reset CKB. CKB, reset CKA. reset CKB. CKB, reset CKA. reset CKA. reset CKB.
VALUE AFTER RESET FLAG AFFECTED, DESCRIPTION
correct 9-bit byte even number ones. correct 9-bit byte number ones. overwriting parity bits. Parity over eight least-significant bits each byte overwritten into most-significant that byte. subject transient glitches while data changing. remains steady until value should change. Asynchronous flag clocking. Synchronous flag clocking. Asynchronous flag clocking. Synchronous flag clocking. Asynchronous flag clocking. Synchronous flag clocking Port clock. Synchronous flag clocking Port clock. Asynchronous flag clocking. Synchronous flag clocking. Asynchronous flag clocking. Synchronous flag clocking. Full-word parity-error indication regardless setting. Full-word, half-word, single-byte parity-error indication according setting. overwriting parity bits. Parity over eight least-significant bits each byte overwritten into most-significant that byte. subject transient glitches while data changing. remains steady until value should change. Asynchronous flag clocking. Synchronous flag clocking. Asynchronous flag clocking. Synchronous flag clocking. Asynchronous flag clocking. Synchronous flag clocking Port clock. Synchronous flag clocking Port clock.
NOTES
PORT COMMAND REGISTER BITS CODE
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LH543611/21 Table Control-Register Format (cont'd)
CKB, reset CKA. reset CKB. CKB, reset CKA. reset CKB.
1024 BiFIFOs
Asynchronous flag clocking. Synchronous flag clocking. Asynchronous flag clocking. Synchronous flag clocking.
Table Controllable Functions
TYPE DESCRIPTION CONTROL-REGISTER PORT PORT
Even/Odd Parity Policy 9/18-Bit Word-Width Selection Generation: Enable/Disable Flag Behavior: Latched/Flowthrough Synchronous/Asynchronous Synchronous/Asynchronous Flag Synchronization Synchronous/Asynchronous Synchronous/Asynchronous
14-15
NOTE: LH5420/LH543601 also have this Control-Register function. same Control-Register bit, controls both Port Port functionality.
PARITY
LH5420/LH543601 CONTROL REGISTER (WRITE-ONLY) (FOR COMPARISON PURPOSES)
PORT FLAG SYNCHRONIZATION PARITY
PORT FLAG SYNCHRONIZATION PARITY
LH543611/21 CONTROL REGISTER (READ/WRITE)
543611-12
Figure LH5420/LH543601 LH543611/21 Control-Register Formats
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FEATURES Pin-Compatible Functionally Upwards-Compatible with Shar

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