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Printed Circuit Board Identification Using 1-Wire Products
Anyone ever tried modem- network-card knows that such undertaking produce unwanted results take more time than expected. achieve cost savings from high volume production, add-in board designed logically compatible large variety motherboards from various vendors. This flexibility makes necessary configure board operating environment before ready function. perform configuration needs pieces information: sufficient knowledge system that board expected reside knowledge board itself. Once suitable settings determined needs jumpers flip switches board. This completes tricky part hardware installation. long such upgrades changes made routinely trained personnel, they time-efficient involve much risk. Every time deal with unfamiliar product, learning cycle begins with studying associated documentation (which well-written) phase trial error, which result damage product system supposed work 1994, concept "Plug-and-Play" (PnP) introduced this awkward situation, particularly with PCs. order function, each device must have following capabilities: must uniquely identified. must state services provides resources requires. must identify software driver that supports must allow software configure (source: Although these requirements were originally specified products, electronic systems that consist more than device circuit board) benefit from Plug Play capabilities. most obvious implement capabilities means memory chip that holds required information does lose power switched off. some cases, suitable memory already board inside microcontroller byte-wide memory chip serial EEPROM). other cases entire memory already assigned other functions, additional memory chip needed. their smaller physical size minimal additional requirements, serial memories preferred over byte-wide memories. serial memories, devices with 1-Wire® interface easiest interface because they require only single data line plus ground reference. Most 1-Wire devices even have pin; they draw energy operation right from data line. 1-Wire devices have unique registration number, which allows traceability performs address multiple 1-Wire devices (not just memories) connected parallel form 1-Wire net. This feature found with other serial devices. Parts registration number customized, which turns 1-Wire device into custom chip that authenticates board makes impractical clone. Spare memory bytes used functions available enable/disable some resources circuit board, opening door license management rather than changing hardware upgrades. Depending storage capacity chip technology, memory could hold manufacturing data quality control, warranty information, repair history. Having such information readily accessible reduces time repair.
1-Wire registered trademark Dallas Semiconductor
060502
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DEVICE TECHNOLOGIES
1-Wire chips printed circuit board identification need maintain stored data independent power supply. This limits choice devices that manufactured nonvolatile (NV) technologies such ROM, EEPROM EPROM (Table lack window plastic package mounting technique chip scale packages with active side towards circuit board converts EPROM chips One-Time-Programmable (OTP) memories.
1-WIRE DEVICES CIRCUIT BOARD IDENTIFICATION Table
PART DS2401 DS2405 DS2430A DS2432 DS2433 DS2406 DS2502 DS2505 DS2506 TECHNOLOGY EEPROM EEPROM EEPROM EPROM EPROM EPROM EPROM MEMORY bits bits bytes bytes bytes bytes bytes 2048 bytes 8192 bytes APPL. TYPE Minimalist Minimalist Nameplate Nameplate Nameplate Nameplate Nameplate Nameplate Nameplate VOLTAGE 2.8V 5.5V 2.8V 5.5V 2.8V 5.5V 2.8V 5.5V 2.8V 5.5V 2.8V 5.5V, write 2.8V 5.5V, write 2.8V 5.5V, write 2.8V 5.5V, write PACKAGES Plastic, Plastic Plastic, Plastic, Plastic, Plastic, Plastic, (excl. UNW) Plastic Plastic EXTRAS controlled bytes Challenge Response controlled pins UniqueWare version UniqueWare version UniqueWare version
Devices based SRAM technology also considered; however, they have limited lifetime, which ends when backup battery exhausted. They well-suited substitutes high-density EPROM parts during prototype phase applications with target lifetime more than years. Except DS2404 DS2423 (both bytes), SRAMs with 1-Wire interface only available iButtons®, package type that requires clip holder connection circuit board. Being able easily remove memory from board contrary circuit board identification, which requires permanent connection between memory board.
CIRCUIT BOARD IDENTIFICATION OVERVIEW
indicated column APPL. TYPE Table there ways identify printed circuit board. minimalist approach based devices using technology. nameplate approach requires user-programmable memory store PnP-related information. Table shows identification alternatives both approaches. Reference numbers beginning with indicate minimalist approach. nameplate approach there devices EEPROM technology (reference numbers beginning with EPROM (numbers beginning with Within each these groups, reference letter stands generic, off-the-shelf parts. letter used parts that have customized ROM. customization explained section Minimalist Approach. letter indicates special features such protected memory (2C) factory pre-programmed parts (3C). more details this section Nameplate Approach. With customized devices, cloning protection achieved restricted supply. Clone manufacturers will able customized parts. achieve protection with generic devices (excluding DS2432) necessary manipulate data, means encryption.
iButton registered trademark Dallas Semiconductor.
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Common encryption methods cipher block chaining) rely ("secret") initialization vector. Embedding unique registration number memory chip initialization vector ensures that identical source data looks different every individual device. This way, data copied from chip another, copy will work application. Details about encryption algorithms software available Internet, example website National Institute Standards Technology (http://csrc.nist.gov/).
OVERVIEW IDENTIFICATION ALTERNATIVES Table
REFERENCE Approach Identification Cloning Protection Plug Play Min. order Typical. volume Relative chip cost (@10k) Minimalist Limited Medium Minimalist With encryption High High High With encryption High
DS2502: DS2505: DS2506: DS2406:
Nameplate Nameplate Nameplate Nameplate Nameplate Nameplate
Automation
DS2401: DS2405:
High
High
parts 100k p.a.
DS2401: DS2405:
parts 100k p.a.
parts parts 100k p.a. 500k p.a.
DS2502: DS2505: DS2506: DS2406: DS2502U: DS2505U: DS2506U: ("U" indicates UniqueWare)
DS2430A: DS2430A: DS2432: DS2433: DS2433:
*There setup custom parts, which included this cost comparison.
MINIMALIST APPROACH
lowest-cost method identifying circuit boards (1A) uses generic (non-customized) DS2401 silicon serial numbers relies central database that associates registration number 1-Wire chip individual board. lack user-programmable memory, this approach does support PnP. somewhat more costly alternative (1B) uses devices with customized registration number. This allows customer (board manufacturer) specify bits 64-bit content (Figure Having control over some bits allows limited compliance. central database still required associate content individual board. function, circuitry board must able read 1-Wire device able forward information host CPU. Since customized chips only sold original customer authorized agents, they controlled products that available clone manufacturers. take advantage this, firmware must able distinguish between legitimate customized chips generic chips customized chips made other customers. Generic devices (1A) easy order and, small quantities, usually shipped from stock. Customized devices (1B) manufactured order have lead-time weeks. Contact Dallas Semiconductor sales organization copy registration form.
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typical chip minimalist approach DS2401. DS2405 similar device that, addition 64-bit ROM, extra that function open-drain output (actuator) digital input (sensor) under software control.
MINIMALIST APPROACH USER MEMORY COMPARISON TABLE
Method Precondition Administration Cloning Protection Advantages Disadvantages
GENERIC DEVICE
Database lookup based registration number. Database that uses registration number access detailed product information. Enter registration number every board into database associate (reference detailed product information. none Lowest chip cost. Database automation limited tester reading registration numbers batch boards then transmitting them list database; association product information created manually. Requires access (remote) database read board's detailed information.
Method
CUSTOMIZED DEVICE
Database lookup based registration number. Board types board versions distinguished different codes customerspecified section (subfield) registration number.
Precondition Administration
Database that uses registration number access detailed product information. Enter registration number every board into database associate (reference detailed product information. portion product information automatically identified content customer-specified bits (subfield). chip less costly than memory chips nameplate approach. Less prone human error, provided that right chip mounted board. different products product versions require different test programs, name test program used verify that right chip mounted board.
Cloning Protection Advantages
Disadvantages
Database automation limited tester reading registration numbers batch boards then transmitting them list together with test program name database. Requires access (remote) database read board's detailed information. Logistics stocking using different customized chips.
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GENERIC CUSTOMIZED REGISTRATION NUMBER Figure
byte Registration Number bits bits Serial Number Serialization Section Generic Device bits
Family Code
Customer Identification
User-Defined Subfield
Serialization Section bits bits bits Customized Family Code
bits bits bits
bits (option bits (option bits (option
Option million serial numbers subfield value Option 16.7 million serial numbers subfield value Option 1.04 million serial numbers subfield value
Examples
Generic DS2401 representation sample registration number:
1010 0011 0000 0000 0000 0000 0000 0000 0000 0000 1101 0100 1001 0010 0000 0001
1110 0101
0001 0010 0011
1010 1011
0000 0000 0000 0101 0110 0001 1101
1000 0001
Customized DS2401, customer hex, option subfield contents representation sample registration number: most significant customized family code always
From reading customized cannot tell what selected option However, particular customer identification code device, option remains same variations user-defined subfield content.
NAMEPLATE APPROACH
devices suitable nameplate approach have user-programmable memory store PnPrelated information. nameplate approach essential list data items that required function, define identify each data item, decide format which (numerical, logical, text) value each data item represented. format customized particular application save space industry-standard, larger, format like (extendible markup language). Further data items added list, provided that they identified format been selected. data items then stored after another sequence memory board identification chip. Alternatively, embed data between length byte beginning check end, store data file. More information file format 1-Wire devices found Application Note 114. Depending memory size bytes) there space other information, such manufacturing data. Since information stored chip board, there real need access central
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database information about board. However, still good practice maintain such database store information that does into memory chip intentionally kept away from public access bill material, names component vendors). with minimalist approach, 64-bit registration number that database. price identification chip depends storage capacity (memory size) technology manufactured shown example later this document, information that essential fits easily into bytes even less. storing additional information considered, bytes small memory chips enough. Conversely, with 2048-byte chip there plenty room store entire bill material more than items compact format. Using less storage-efficient tagging format, 2048 bytes still enough include bill material items. Suitable memory chips nameplate approach manufactured technologies: EEPROM OTP-EPROM. either technology there generic chips (referenced EEPROM EPROM) well ROM-customized chips respectively). customization same described minimalist approach (see Figure same restrictions recommendations apply. protected EEPROM (2C) customized user installing 8-byte secret device. Once installed, secret contrast password never exposed 1-Wire line. When writing protected EEPROM, host computer needs send 160-bit message authentication code, which calculated from secret other data. When reading EEPROM, device also generate authentication code that allows master verify whether chip knows correct secret without ever exposing secret itself. UniqueWare devices (3C) special case customization. customer-specific programming takes place more first four memory pages. always includes Project distinguish between data patterns customers) customer-specified serialization. UniqueWare subject same restrictions devices with customized ROM. more information UniqueWare refer Application Note Generic devices (2A, easy order small quantities usually shipped from stock. Customized devices (2B, manufactured order have lead-time weeks. Contact Dallas Semiconductor sales organization copy registration form. UniqueWare devices (3C) also programmed demand. However, since customization takes place packaged part, lead-time shorter than ROM-customized parts. smallest EEPROM chip nameplate approach (2A, DS2430A. special feature, this chip, addition bytes re-programmable memory, 8-byte one-time programmable register. DS2433 storage capacity bytes, organized pages bytes each. There currently only protected EEPROM device (2C), DS2432. This device store bytes pages bytes) application data 8-byte secret. There eight more registers control functions. EPROM technology (3A, there four devices chose from: DS2502 (128 bytes), DS2505 (2048 bytes), DS2506 (8192 bytes), DS2406 (128 bytes). these devices organized memory pages bytes. addition memory, DS2406 extra pins that under software control function open-drain output (actuator) digital input (sensor). DS2502, DS2505, DS2506 also available UniqueWare versions (3C).
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NAMEPLATE APPROACH EEPROM COMPARISON TABLE
Method Precondition
GENERIC DEVICE
User-programmable memory chip stores relevant data circuit board. Optional: Database lookup based registration number additional data. Definition data, additional data desired), data representation, formatting. Board tester that programs memory chip final test. Optional: Database access additional product information.
Administration
Ensure that board tester uses correct software. Optional: Create link between tester database store board registration number, copy chip data, board test results.
Cloning Protection Advantages Disadvantages
unless data encrypted. Highly automated database. memory chip programmed with incorrect data, reprogrammed. More costly than minimalist approach. Unless encrypted, data safe from unauthorized changes.
Method Precondition Administration Cloning Protection Advantages Disadvantages
CUSTOMIZED DEVICE
(Same (Same (Same Yes, encryption optional. (Same More costly than generic device. Unless encrypted, data safe from unauthorized changes.
Method Precondition
PROTECTED DEVICE (Customization User)
(Same Board tester, which final test installs secret memory chip programs with desired data. (Otherwise same Ensure that board tester uses correct software correct secret. (Otherwise same Yes, encryption optional. Data read altered without knowing secret. secret write-protected. (Otherwise same
Administration Cloning Protection Advantages
Disadvantages
More costly than minimalist approach.
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NAMEPLATE APPROACH EPROM COMPARISON TABLE
Method Precondition Administration Cloning Protection Advantages
GENERIC DEVICE
(Same Board tester with capability that programs memory chip final test (Otherwise same (Same unless data encrypted. Highly automated database. memory chip programmed with incorrect data, incorrect data invalidated data written unused memory section available). Data write-protected blocks bytes.
Disadvantages
More costly than minimalist approach. Requires writing memory chip.
Method Precondition Administration Cloning Protection Advantages Disadvantages
CUSTOMIZED DEVICE
(Same (Same (Same Yes, encryption optional. (Same More costly than generic device. Requires writing memory chip.
Method
PARTIALLY PREPROGRAMMED DEVICE UNIQUEWARE
Customized chip preprogrammed partially write protected chip factory. Remaining user-programmable memory stores relevant data circuit board. Optional: Database lookup based registration number additional data.
Precondition
Definition serialization format constant data that pre-programmed chip factory. (Otherwise same (Same Yes, encryption optional. (Same (Same
Administration Cloning Protection Advantages Disadvantages
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NAMEPLATE DESIGN CONSIDERATIONS
electronic nameplate include data items that required PnP, means identify each data item, value each item suitable format. Space permitting, there additional information added nameplate. with metal paper nameplates, might want include company's name address information. Since OTP-EPROM bits only programmed from format definition that allows changing programmed data under such constraints desirable. following sample design concept meets these requirements. nameplate begins with ASCII string company name website address, followed byte delimiter. subsequent data organized groups. Each group contains data items particular purpose. Each data item identification number 255) that unique within group. length data item values within group same. Each group begins with introductory byte that identifies group number value length bytes) that applies group. group number stored higher nibble introductory byte, leaving lower four bits specify value length. After last value group there byte delimiter. viability this definition demonstrated TINI®-board, miniature server size SIMM board. TINI server consists approximately components, including microprocessor. Some components jumpers installed only certain versions board. data organized into groups, manufacturing data data, shown Table
SAMPLE NAMEPLATE CONTENTS Table
GROUP FUNCTION Manufacturing Data Data ITEMS Product name Part number Hardware revision Date code/lot number chip select size Ethernet Chip Presence Ethernet Chip SIMM connection Non-volatizer presence IDENT. LENGTH bytes each byte each FORMAT ASCII
Numeric Numeric (Mbits) Boolean Boolean Boolean
manufacturing data includes everything that typical integrated circuits. this information represented ASCII text more than bytes each item. data consists five parameters: number chip select lines, size each chip, presence Ethernet chip, connection Ethernet chip SIMM pins, presence nonvolatizer. first these parameters have numeric value; three others "Boolean", which means they either true false. Although these Boolean parameters could merged into three bits single byte, this done this example. Instead, full byte "true" "false" used. full nameplate including company name will look like this:
(C)DALLAS SEMICONDUCTOR www.ibutton.com<00> <1C><01>TINI SERVER <02>90-TINI1-512<03>REVB1 030900<04>0023B/117989<00>
Information between angled brackets represents bytes hexadecimal format. other information plain ASCII text. whole nameplate requires just bytes, which easily DS2502 chip.
TINI registered trademark Dallas Semiconductor
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bigger memory chip chosen, could include full parts list bill material nameplate. this purpose parameter groups could organized like this:
GROUP FUNCTION Manufacturing data Plug Play data Batteries Capacitors Diodes Transistors Resistors part part Crystals Circuit Board LENGTH bytes each byte each bytes each bytes each bytes each bytes each bytes each bytes each bytes each bytes each bytes each FORMAT ASCII (varies) ASCII ASCII ASCII ASCII ASCII ASCII ASCII ASCII ASCII
Applied same example board, this information would into less than bytes. this estimate, Dallas-internal part numbering system chosen that assigns 12-character part number anything including component parts. Since first three characters component parts always same they were omitted, reducing length nine characters. part numbers integrated circuits group nine start with different code. this reason full length used. Since identification number precedes each item within group, sequence items critical. sequence groups changed also, because each group identified introductory byte. This flexibility allows invalidating group individual parameter within group redefine later. This particular interest with OTP-EPROM devices. Changing group number invalidates group; don't change bits that specify length parameters within group. copy whole group then appended after last parameter group. invalidate redefine parameter, change parameter number original location append version parameter group with parameter value. necessary also include those parameters group that have changed. Invalidation redefinition values groups necessary with EEPROM devices. anything changes, entire data re-written. sample design concept described above create nameplate. binary ASCII data minimizes memory consumption, standardized. Less memory-efficient standardized format, which uses ASCII codes only. format, same example look like this:
<NamePlate name="TINI SERVER"> <Company> (C)DALLAS SEMICONDUCTOR www.ibutton.com </Company> <ProdData> <PartNo> 90-TINI1-512 </PartNo> <Rev> 030900 </Rev> <Date> 0023B/117989 </Date> </ProdData> <Config> <MemChips> </MemChips> <MemSize> 4Mbits </MemSize> <EthChip> true </EthChip> <EthSimm> true </EthSimm> <NonVol> true </NonVol> </Config> </NamePlate>
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This file bytes long; formatted 1-Wire file structure described AN114, this nameplate will fill memory pages DS2433 chip. size file reduced choosing shorter abbreviations each parameter.
OBTAINING CONVENTIONAL BOARD SERIAL NUMBER
Despite having electronic board identification nameplate, there desire also print conventional, human-readable serial number circuit board. hexadecimal form serial number already included 64-bit registration number. nameplate approach chosen, embed decimal serial number design nameplate. UniqueWare, special case nameplate approach, already includes customer-specified serialization factory-programmed memory section. Altogether there four cases distinguished: Generic Silicon, Minimalist Approach (Reference conventional serial number, take 48-bit serial number (see Figure convert into decimal number. Since DS2401, typical chip minimalist approach, produced large quantities resulting decimal number digits long. Customized Silicon, Minimalist Nameplate Approach (References conventional serial number, take content serialization section convert into decimal number. shown Figure serialization section customized parts does exceed bits. This limits length serial number decimal digits (option digits under option Depending forecasted demand, 7-digit printed serial number acceptable. When defining format printed serial number should decide whether include user-defined subfield. hexadecimal format functions case; depending subfield content, could take digits binary-coded decimal (BCD) print them straight decimal numbers. When printing whole registration number parts hexadecimal format, should printed left family code right. Example: 25002066007A8081. Omitting family code CRC, leaves 002066007A80, customer identification combination user-defined subfield serial number. Knowing option this example), tell that actual serial number this device 007A80 hexadecimal 31360 decimal. this example, subfield seen decimal well hexadecimal. Generic Silicon, Nameplate Approach (References preferred conventional serial number include decimal form nameplate. This type serialization needs managed software that controls board tester, task that easy expected. Since serial number definition needs different every part, gang-programming identification chips before they mounted circuit board option. Instead including serialization nameplate, could fall back same procedure case Generic Silicon, Minimalist approach. Partially Preprogrammed Silicon, Nameplate Approach (Reference elegant solving serialization problem, which arises with generic silicon nameplate approach, UniqueWare. contrast customization, with UniqueWare customization takes place EPROM section chip. Starting with ROM-customized silicon, EPROM programmed with project identification number, customer-specified decimal hexadecimal serialization, plus (optional) customer-supplied constant data. factory-programmed memory pages write-protected. conventional serial number read straight from EPROM and, decimal serialization chosen, used without number conversion.
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UniqueWare devices have customized family code share customer distinguish them from generic silicon (see Figure project identification number ensures that devices programmed different customers/applications always identifiable, even data specification exactly same. (See Figure example.) Since UniqueWare parts only available programmed with customer-specific data never "blank" parts they offer same level protection other customized silicon parts, plus benefits convenient serialization shorter lead time. more information UniqueWare specify desired data pattern serialization refer Application Note
UNIQUEWARE SECTION Figure
DEVICE TYPE DS2502U DS2505U DS2506U Example 8-bit 64-BIT REGISTRATION NUMBER UniqueWare Identifier Device Serial Number (hex format) (hex format) (hex format) Family Code
CONNECTION MAIN CIRCUIT
data host CPU, board identification chip must connected circuitry board. interface shown Figure fits bi-directional port. open-drain characteristic, port 8051-compatible microcontroller preferred choice drive 1-Wire line.
DUAL-READ MODE INTERFACE Figure
2.2kW 2N7002 Jumper (see text) External Probe Point 1-Wire DATA Port Board Identification Chip
1-Wire Device
During normal operation, port pulled high through 2.2kW resistor. parasitic diode inside MOSFET ensures that voltage 1-Wire device gets close even zero MOSFET off. microcontroller puts logic (0V) port pin, high enough make transistor conducting. This voltage port propagated through transistor 1-Wire device. transmit 0-bit microcontroller, 1-Wire device shorts 1Wire line Ground short time. During that time current flows from through resistor through parasite diode MOSFET through 1-Wire device. Despite voltage drop between source drain MOSFET, voltage port remains permissible range safely recognized logic transmit 1-bit, 1-Wire device remains high impedance. result, 1-Wire line pulled resistor soon microcontroller stops pulling low. board powered, read 1-Wire chip through external probe point. 2.2kW resistor
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ensures that MOSFET which keeps transistor non-conducting, preventing current flow from external 1-Wire reader into other circuitry board. jumper shown Figure only required with EPROM devices. must removed protect MOSFET from pulses, which tester applies program EPROM chip with nameplate data. After programming completed, jumper must reinstalled give microcontroller access identification chip. concept circuit Figure applied other types serial interface; however, decoupling transistor will necessary data line well clock control signals. also necessary de-couple power line serial memory chip. Instead simple 2-pin probe point, 5-pin connector required. further disadvantage, non-1-Wire serial memory devices don't come with built-in customizable serialization. With security features, DS2432 unique market; direct competitors.
REAL WORLD EXAMPLE
TINI-board, which chosen example nameplate design considerations, actually includes electronic nameplate. Ethernet interface, each these boards needs Ethernet Address. easiest implement such addresses silicon means UniqueWare. Since UniqueWare data consumes only memory page DS2502 memory chip, there were three memory pages available nameplate extra cost. actual TINI nameplate design somewhat different from sample design concept. This acceptable long relevant data included, identifiable, value. TINI nameplate contains seven data entities tags, shown Table
TINI NAMEPLATE CONTENTS Table
NAME TAG_TINI_HW_VERSION TAG_DATE_CODE TAG_RAM_CHIP_SELECT_CONFIG TAG_RAM_SIZE_EACH_CONFIG TAG_SMC_NOT_PLACED TAG_SMC_PORT_PINS_CONNECTED TAG_NONVOLATIZER_NOT_PLACED LENGTH bytes bytes byte bytes byte byte byte FORMAT ASCII numeric numeric numeric numeric numeric numeric POSSIBLE VALUES (text string) (UNIX 32-bit time format) 16777216 bytes Ethernet available, Ethernet unavailable pins connected, pins connected non-volatizer used, non-volatizer used
Each identified number that followed length byte value. Beginning with number seven tags concatenated form TINI configuration data. configuration data reformatted into data packets bytes each, matching size memory page. Each packet begins with length byte ends with CRC16. resulting data pattern including UniqueWare data sample device shown Figure
SAMPLE TINI IDENTIFICATION CHIP Figure
UniqueWare Section
Address 0000 0010
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SAMPLE TINI IDENTIFICATION CHIP Figure (continued)
Nameplate Section
Address 0020 0030 0040 0050 0060 0070
Color Code Legend:
Data Packet Length Byte UniqueWare Project Identification Number UniqueWare constant data (IEEE company Identification) Nameplate Parameter Number Parameter Length Data Packet UniqueWare serialization color unused byte) Nameplate Parameter Value
read nameplate, needs identify numbers that followed size. many subsequent bytes indicated length value. next byte again number, Table shows data Figure decoded form. When decoding values, important know that multi-byte numbers stored with least significant byte lower address ("Little Endian" byte order). restore natural sequence digits needs write down bytes (not digits) reverse order from right left shown "Explanation" column). Text stored natural sequence first character lower address).
NAMEPLATE DECODED Table
UNIQUEWARE SECTION (N/A) (N/A) (N/A) VALUE (text) EXPLANATION UniqueWare Project number 00001129 Ethernet Extension 0093B8 (UniqueWare serialization) Ethernet Company 006035 (UniqueWare constant data) Text TINI Model DSTINI1-512" 3A363EA0 December 2000, 15:05:04 hours (see note) chip select decimal 524288 bytes (512K) Ethernet chip available port pins connected SIMM edge connector Non-volatizer used
NAMEPLATE SECTION
NOTE: date code 3A363EA0 represents 976633504 seconds after hours January 1st, 1970. This time format assumes that exactly hours. conversion from seconds time therefore very straightforward. computation date includes leap year compensation more complex. description algorithm convert from conventional time date seconds vice versa application note Algorithm Converting Binary Seconds into Date/Time, category "Real-Time Clocks" http://www.maxim-ic.com/ website. Since configuration data packetized using length byte beginning CRC16 end, possible invalidate parameter update nameplate after second memory chip installed). This would have been possible without packetizing. This packetizing, however, protects data chip against memory errors. CRC16 would match memory flipped. safeguard against errors during communication, 1-Wire EPROM chips support read function that automatically generates based memory data transmits after memory page.

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