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User's guide
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3.13.1 VPD EEPROM (Vital Product Data)
This 8-kbit serial EEPROM is used to store a set of board specific parameters. These parameters
provides the board configuration information (board revision, Ethernet addresses, SDRAM configuration,
FLASH memory configuration, etc).
EEPROM address 0xad
Table 8 - VPD EEPROM address
The VPD memory structure is defined as follows.
Field
Offset
Size
Values
Magic Cookie
0x00
8
0x41 0x43 0x54 0x49 0x53 0x00 0x00 0x00 ("ACTIS")
Size of EEPROM
0x08
2
0x01 0x00
Reserved
0x0a
4
0x00 0x00 0x00 0x00
Date
0x0e
2
YY MM (BCD Format)
Options
0x10
240 max
XX
Table 9 - VPD serial EEPROM structure
The Option fields may have fixed or variable length. Each option begins with a tag octet, with a user-value
defined between 0x80 to 0xfe (all other are reserved). The fixed-length type options, which do not include
data, consist of only a tag octet. Only options 0x00 and 0xff are fixed-length type. All other options are
variable-length type with a length octet following the tag octet. The value of the length octet does not
include the two octets specifying the tag and length. The length octet is followed by "length" octets of
data. In the case of some variable-length options the length field is a constant but must still be specified.
Option
Code
Length Description
Pad
0x00
F, 1
The pad option can be used to cause subsequent fields to align on word
boundaries
End
0xff
F, 1
The end option marks the end of valid information in the vendor field.
Subsequent octets should be filled with pad options
Product Identifier (optional)
0x01
V
This option specifies the name of the product (ASCII terminated by a zero
byte).
Serial Number (optional)
0x03
V
This option specifies the serial number of the product (ASCII terminated by a
zero byte)
Revision (optional)
0x08
F, 4
This option specifies the firmware revision of the board
PCB Revision (optional)
0x09
F, 2
This option specifies the PCB revision
CPU Type (optional)
0x20
V
This option specifies the name of the processor (ASCII terminated by a zero
byte)
CPU Clock Speed
0x21
F, 4
This option specifies the output clock speed in hertz (4 Bytes, MSB first)
Dynamic RAM
0x30
F, 4
This option specifies the dynamic RAM configuration (binary code which can
prevent use of SDRAM)
Flash Memory (optional)
0x3c
F, 4
This option specifies the Flash memory configuration (binary code)
Ethernet Address #1
(optional, first Ethernet dev)
0x60
F, 6
This option specifies the first Ethernet address (6 Bytes, MSB first)
Ethernet Address #2
(optional, first Ethernet dev)
0x61
F, 6
This option specifies the second Ethernet address (6 Bytes, MSB first)
Ethernet Address #3
(optional, first Ethernet dev)
0x62
F, 6
This option specifies the third Ethernet address (6 Bytes, MSB first)
Table 10 - VPD options field
The optimized values are defined and stored by the factory. It is not recommended to
change these parameters, since a wrong setting could affect the system operation.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
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