2. Getting Started
19
to by the on-board AT/LANTIC, allowing the configuration to be changed and saved.
The memory map of the EEPROM is shown in the "
EEPROM Contents
" table.
The fields in the EEPROM are defined as:
Configuration Register A - Stores the base I/O Address and Interrupt number that the
board is currently using. The AT/LANTIC has write access to this location. See the
"
Configuration Register A
" bit description below.
Configuration Register B - Stores the Physical Layer Interface and programmable bus
options. The AT/LANTIC has write access to this location. Refer to the
"
Configuration Register B
" bit description below.
Configuration Register C - Stores the Boot PROM address and other hardware-
specific configuration options. The AT/LANTIC cannot write to this location. See the
"
Configuration Register C
" bit description below.
42h - This location (08h) must contain 42h (ASCII 'B'). When W17 is installed (low), the
software will read this location in the PROM Store register of the AT/LANTIC and
determine that the board is in an 8-bit STD slot. The AT/LANTIC cannot write to this
location.
57h - This location (07h) must contain 57h (ASCII 'W'). When W17 is removed (high),
the software will read this location in the PROM Store register of the AT/LANTIC and
determine that the board is in a 16-bit STD 32 slot. The AT/LANTIC cannot write to this
location.
CHECKSUM - This location is used only in Shared RAM mode. The checksum is used
to verify the Ethernet Address and the board type. The two's compliment addition of the
last eight bytes (03h..00h) must equal FFh, otherwise there is an error. The value of the
checksum is determined from this. The AT/LANTIC cannot write to this location.
BOARD TYPE - This location is used only in Shared RAM mode. The Board Type
indicator tells the network driver what hardware is being used. The AT/LANTIC cannot
write to this location. When the board is configured to operate in WD8003EBT
compatible Shared RAM mode, the Board Type should be 05h.
ETHERNET ADDRESS - The last six bytes of the EEPROM contain the Ethernet
Address issued by the IEEE. These bytes are programmed uniquely prior to fitting the
device onto the board because the AT/LANTIC is unable to write to these locations.
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