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DS2502P-E64
IEEE EUI-64 Node Address Chip
FEATURES IEEE-approved factory programmed 64-bit
node address chip (EUI-64) with 768 bits
user-programmable OTP-EPROM
communicates with the economy of one
signal plus ground§ Meets the node identification requirements of
IEEE Standard 1394-1995 (FireWireä) Unique, factory-lasered and tested 64-bit
registration number (8-bit family code 89H +36-bit serial number + 12-bit UniqueWare
identifier 5E7H + 8-bit CRC tester) assures
absolute traceability because no two parts are
alike Built-in multidrop controller ensurescompatibility with other MicroLAN products Device is an “add only” memory where
additional data can be programmed into
EPROM without disturbing existing data Reduces control, address, data, power andprogramming signals to a single pin Directly connects to a single port pin of a
microprocessor and communicates at up to
16.3k bits per second Presence detector acknowledges when readerfirst applies voltage Low cost TO-92 or TSOC surface mount
packages Reads over a wide voltage range of 2.8V to
6.0V from -40°C to +85°C; programs at11.5V to 12.0V from -40°C to +50°C
3 2 1
PIN ASSIGNMENT
ORDERING INFORMATIONDS2502-E64TO-92 package
DS2502P-E646-pin TSOC package
FireWireTM is a trademark of Apple Computer,
Inc.
GLOBAL INDENTIFIER DESCRIPTIONThe DS2502-E64 is a variant of the DS2502 1024-bit Add-Only Memory. It differs from the standard
DS2502 in its custom ROM family code 89H, and the UniqueWare Identifier 5E7 in place of the upper 12
bits of the standard ROM serialization field. Otherwise, the electrical and logical behavior is identical tothat of the DS2502. For technical details please refer to the DS2502 data sheet. The first 32 bytes of the
DS2502-E64’s EPROM memory contain a globally unique 64-bit node address (EUI-64) and are write-
protected. The data structure follows the conventions of UniqueWare devices using Default Data
IEEE EUI-64 Node Address ChipSIDE VIEW
See Mech.Drawing Section
TOP VIEW
TSOC PACKAGE
E 6 4
2 5 0 2
RR = DIE REVISION CODE
CCCCCC = COUNTRY CODE
DS2502-E64
The data record starts with a length byte (0CH) and the 4-byte UniqueWare Project ID 00001128H. Thenext eight bytes contain the EUI-64 global identifier (node address) which consists of an incrementing
40-bit extension identifier and the IEEE-assigned 24-bit company ID value 006035H. A 16-bit CRC ends
the data record. The remaining bytes of the 32-byte memory page remain unprogrammed. Neither the 40–
bit extension identifier nor the 24-bit company ID are related to the 64-bit ROM registration number,
which is distinct from the IEEE Standard 1394-1995 node address. The ROM registration number is used
to provide a unique address to access the DS2502-E64 when multidropped on a 1-WireTM bus.
EUI-64 NODE ADDRESS CHIP DATA STRUCTURE Figure 1high addresslow address
EXAMPLEAssume that a manufacturer’s company ID value is 00603516 and the 40-bit extension identifier is
234567ABCD16. The EUI-64 value generated from these two numbers is 006035234567ABCD16, whose
byte and bit representations are illustrated in Figure 2. This information is stored in the DS2502-E64 as
64-bit number with the least significant byte at the lower address. Including the length byte and the CRC,
the complete set of data is shown in Figure 3.
SAMPLE EUI-64 VALUE Figure 2HEXBINARYLEAST SIGNIFICANT
PHYSICAL ADDRESS AND DATA MAPPING INSIDE THE DEVICE Figure 3XX XX = CRC16, value depends on actual data
The four bytes at memory addresses 01 to 04 contain the UniqueWare Project ID 0000112816. The two
bytes at addresses 0DH and 0EH are the 16-bit CRC over the length byte, Project ID and EUI-64 value.
The least significant byte of the CRC is stored at address 0D. This CRC is generated according to the
standardized CRC16 polynomial function X16 + X15 + X2 + 1. For more details on generating CRC valuesincluding examples in both hardware and software, see the “Book of DS19xx iButton Standards” or
Application Note 27.
The contents of the memory address range 0FH to 1FH is FFH. These cells cannot be altered since the
whole memory page is write-protected. The memory range from 20H to 7FH, however, is user-
programmable. It can be write-protected by programming the corresponding write-protect bit in the status
memory of the DS2502-E64.
This datasheet has been :
www.ic-phoenix.com
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