Configurable UART with FIFO 2.08 D16550 soft Core Universal Async

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Configurable UART with FIFO 2.08 D16550 soft Core Universal Async

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D16550
Configurable UART with FIFO 2.08
D16550 soft Core Universal Asynchronous Receiver/Transmitter (UART) functionally identical TL16C550A. D16550 allows serial transmission modes: UART mode FIFO mode. FIFO mode internal FIFOs activated allowing bytes (plus bits error data byte RCVR FIFO) stored both receive transmit directions. D16550 performs serial-toparallel conversion data characters received from peripheral device MODEM, parallel-to-serial conversion data characters received from CPU. read complete status UART time during functional operation. Status information reported includes type condition transfer operations being performed UART, well error conditions (parity, overrun, framing, break interrupt). D16550 includes programmable baud rate generator that capable dividing timing reference clock input divisors (216-1), producing clock driving internal transmitter logic. Provisions also included this clock drive receiver logic. D16550 complete MODEM control capability, processor-interrupt system. Interrupts programmed user's requirements, minimizing computing required handle communications link. separate BAUD line allow exact transmission speed, while UART
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internal logic clocked with frequency. modes supported: single transfer multi-transfer. These modes allow UART interface higher performance units, which interleave their transfers between cycles execute multiple byte transfers. configuration capability allows user enable disable during Synthesis process Modem Control Logic FIFO's Control Logic, change FIFO size. applications with area limitation where UART works only 16450 mode, disabling Modem Control FIFO's allow save about logic resources. D16550 universal microcontroller interface, allows correct communication with D16550 matter D16550 clock related microcontroller clock. core perfect applications, where UART Core microcontroller clocked same clock signal implemented inside same ASIC FPGA chip, well standalone implementation, where several UARTs required implemented inside single chip, driven some off-chip devices. Thanks universal interface D16550 core implementation verification very simply, eliminating number clock trees complete system.
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APPLICATIONS
Serial Data communications applications Modem interface
Technology Code
independent
Source
Full prioritized interrupt system controls Fully synthesizable static design with internal tri-state buffers
FEATURES
Software compatible with 16450 16550 UARTs Configuration capability Separate configurable BAUD clock line modes operation: UART mode FIFO mode Majority Voting Logic FIFO mode transmitter receiver each buffered with byte FIFO reduce number interrupts presented Adds deletes standard asynchronous communication bits (start, stop, parity) from serial data UART mode receiver transmitter double buffered eliminate need precise synchronization between serial data Independently controlled transmit, receive, line status, data interrupts False start detection programmable baud generator MODEM control functions (CTS, RTS, DSR, DTR, DCD) Fully programmable characteristics:
DESIGN FEATURES
functionality D16550 core based Texas Instruments TL16C550A. following characteristics differentiate D16550 from Texas Instruments devices: bi-directional data been split into separate buses: datai(7:0), datao(7:0) Signals wr2, xin, xout have been removed from interface Signal address latch have been removed DLL, registers reset zeros TEMT THRE bits Line Status Register, reset during second clock rising edge following write RCLK clock replaced global clock CLK, internally divided BAUD factor. Asynchronous microcontroller interface replaced equivalent Universal interface latches implemented original 16550 devices replaced equivalent flip-flop registers, with same functionality
serial-interface
8-bit characters Even, odd, no-parity generation detection 2-stop generation Baud generation
Complete status reporting capabilities Line break generation detection. Internal diagnostic capabilities:
Loop-back controls communications link fault isolation Break, parity, overrun, framing error simulation
Modes allows single multitransfer
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Copyright 1999-2007 Digital Core Design. Rights Reserved.
DELIVERABLES
Source code: VHDL Source Code or/and VERILOG Source Code or/and Encrypted, plain text EDIF netlist VHDL VERILOG test bench environment Active-HDL automatic simulation macros ModelSim automatic simulation macros Tests with reference responses Technical documentation Installation notes core specification Datasheet Synthesis scripts Example application Technical support Core implementation support months maintenance
Source Netlist Single Design Unlimited Designs
CONFIGURATION
following parameters D16550 core easy adjusted requirements dedicated application technology. Configuration core prepared effortless changing appropriate constants package file. There need change parts code.
Baud generator External RCLK source External BAUDCLK source Modem Control logic Register FIFO Control logic enable disable enable disable enable disable enable disable enable disable enable disable
Delivery Core updates, minor major versions changes Delivery documentation updates Phone email support
LICENSING
Comprehensible clearly defined licensing methods without royalty fees make using Core easy simply. Single Design license allows Core single FPGA bitstream ASIC implementation. Unlimited Designs, Year licenses allow Core unlimited number FPGA bitstreams ASIC implementations. cases number Core instantiations within design, number manufactured chips unlimited. There time restriction except Year license where time limited months.
APPLICATION
addr addr latch addr(2:0) D16550 baudclk rclk
datao(7:0) datai(7:0)
datai(7:0) datao(7:0) intr rxrdy txrdy out1 out2
Drivers
Single Design license
VHDL, Verilog source code called Source Encrypted, plain text EDIF called Netlist
baudclken rclken
Year license
Encrypted Netlist only
Typical D16550 processor connection shown figure above.
Unlimited Designs license
Source Netlist
Upgrade from
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SYMBOL
rclk baudclk datai(7:0) address(2:0) baudclken rclken baudout intr datao(7:0) ddis txrdy rxrdy out1 out2
BLOCK DIAGRAM
Data Buffer data Buffer accepts inputs from system generates control signals other D16550 functional blocks. Address ADDR(2:0) selects register read from/written into. Both signals active low, qualified ignored unless D16550 been selected holding low.
D16550
addr(2:0) datai(7:0) datao(7:0) ddis txrdy rxrdy
Data Buffer
Receiver Control Shift Register
rclk rclken
PINS DESCRIPTION
datai[7:0] addr[2:0] rclk baudclk baudclken rclken baudout datao[7:0] ddis txrdy rxrdy out1 out2 intr
RCVR Buffer RCVR FIFO
TYPE
input input input input input input input input input input input input input input input input output output output output output output output output output output output
DESCRIPTION
Global reset Global clock Parallel data input Address Chip select input Write input Read input Receiver clock Baud generator clock Serial data input Clear send input Data ready input Data carrier detect input Ring indicator input Baud generator clock enable Receiver clock enable Baud generator output Parallel data output Serial data output Driver disable output Transmitter ready output Receiver ready output Request send output Data terminal ready output Output Output Interrupt request output
out1 out2
Modem control logic
Transmitter Control Shift Register
baudclk baudclken baudout
Buffer FIFO Baud Generator Interrupt Controller
intr
Baud Generator D16550 contains programmable baud generator that divides clock input divisor range between (216-1). output frequency baud generator baud rate. formula divisor
divisor
frequency baudrate
Note: When enabled RCLK BAUDCLK pins frequency should least times lower than CLK, 2*fRCLK< fCLK
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8-bit registers, called divisor latches DLM, store divisor 16-bit binary format. These divisor latches must loaded during initialization D16550 order ensure desired operation baud generator. When either divisor latches loaded, 16-bit baud counter also loaded rising edge following write
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Copyright 1999-2007 Digital Core Design. Rights Reserved.
prevent long counts initial load. Modem Control Logic controls interface with MODEM data peripheral device emulating MODEM). Interrupt Controller D16550 consists fully prioritized interrupt system controller. controls interrupt requests interrupt priority. Interrupt controller contains Interrupt Enable (IER) Interrupt Identification (IIR) registers. Receiver Control Receiving starts when falling edge Serial Input (SI) during IDLE State detected. After starting input sampled every internal baud cycles shown figure below. When logic state detected during START means that False Start detected receiver back IDLE state. Receiver FIFO FIFO levels deep, receives data until number bytes FIFO equals selected interrupt trigger level. that time interrupts enabled, UART will issue interrupt CPU. FIFO will continue store bytes until holds them. will accept more data when full. more data entering shift register will Overrun Error flag. Transmitter Control module controls transmission written (Transmitter Holding register) character serial output transmission starts next overflow signal internal baud generator, after writing register Transmitter FIFO. Transmission control contains register transmitter shift register. Transmitter FIFO portion UART transmits data through soon loads byte into FIFO. UART will prevent loads FIFO currently holds characters. Loading FIFO will again enabled soon next character transferred shift register. These capabilities account largely autonomous operation UART starts above operations typically with interrupt.
PERFORMANCE
following table gives survey about Core area performance ALTERA® devices after Place Route:
Speed grade CYCLONE CYCLONE STRATIX STRATIX STRATIXGX MERCURY EXCALIBUR APEX APEX20KC APEX20KE APEX20K ACEX1K FLEX10KE Device
Logic Cells 4611 4521 3881 4521 5131 4791 4801 4791 4791 4791 5001 5001
Fmax
FIFOs implemented EAB's Bits
Core performance ALTERA® devices
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D16X50 UARTS FAMILY family D16X50 UART Cores combine high-performance, cost, small compact size, offering best price/performance ratio Market. DCD's Cores dedicated cost-sensitive consumer products, computer peripherals, office automation, automotive control systems, security telecommunication applications. D16X50 Cores written pure VHDL/VERILOG languages which make them technologically independent. D16X50 Cores fully customized according customer needs.
Prioritized interrupt system Internal diagnostic capabilities
D16450 D16550 D16750 D16552 D16752 D16754
IRDA Port
Design
*-Optional D16X50 family Configurable UARTs with FIFO Cores
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1284 Parallel Port
FIFO Size (Bytes)
Break generation detection
Complete status reporting
False START detection
MODEM Control
Separate BAUD Clock line
UARTS number
RTS/CTS Flow Control
Majority voting logic
Software Flow Control
FIFO Mode operation
UART Mode
CONTACTS
modification special request please contact Digital Core Design local distributors. Headquarters: Wroclawska 41-902 Bytom, POLAND
nfo@dcd.pl e-mail: iinfo@dcd.pl
tel.
Distributors: http://www.dcd.pl/apartn.php Please check http://www.dcd.pl/apartn.php
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Configurable UART with FIFO 2.08 D16550 soft Core Universal Async

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