LAN83C175 Datasheet, PDF (62/92 Pages) SMSC Corporation – Ethernet CARDBUS Integrated Controller With Modem Support

10 - I/O BASE ADDRESS
Reset Value:
xxxxxxxxxxxxxxxxxxxxxxxx00000001
31 through 8: BASE ADDRESS
7 through 2: Return zeroes to indicate that
256 bytes of address space are required.
1: Reserved (always returns zero).
0 - I/O SPACE INDICATOR: This read only
bit returns a 1 to map the control registers into
I/O space.
14 - MEMORY BASE ADDRESS
Reset Value:
xxxxxxxxxxxxxxxxxxxx000000000000
31 through 12 - BASE ADDRESS: When the
memory map enable bit in the NVCTL register
is set to 1, these are read/write register bits.
When memory mapping is disabled, these bits
return zeroes.
11 through 4: Return zeroes to indicate that 4
Kbytes of address space are required.
3 - PREFETCHABLE: This read only bit
returns 0 to indicate that this address space is
not pre-fetchable.
2 and 1 - TYPE: These two read only bits
return "00" to indicate that the control registers
may be mapped anywhere in 32-bit address
space.
0 - MEMORY SPACE INDICATOR: This read
only bit returns a 0 to map the control
registers into memory space.
28 - CIS POINTER
Reset Value:
unknown, determined by data in external Flash
RAM
This read only register points to the location of the
CardBus "Card Information Structure."
31: Reserved (always returns zero).
30 through 28 - ADDRESS SPACE INDICATOR:
to indicate that the CIS is mapped into expansion
ROM space.
27 through 24 - ROM IMAGE NUMBER: to
indicate that the CIS is located in image 0 in the
expansion ROM.
This is written by the EEPROM recall.
2C - SUBSYSTEM / SUBSYSTEM VENDOR ID
Reset Value:
unknown; written during EEPROM recall
This read only register is used to uniquely identify
the add-in board or subsystem on which the
LAN83C175 resides. The value is recalled from
EEPROM after power-up reset.
31 through 16 - SUBSYSTEM ID: This field is
vendor specific and may be assigned freely. Bit
31 is hardwired to 0. The remaining bits are
recalled from EEPROM.
15 through 0 - SUBSYSTEM VENDOR ID: This
field identifies the subsystem vendor. The value
is assigned by the CardBus SIG.
30 - EXPANSION ROM BASE ADDRESS
Reset Value:
XXXXXXXXXXXXXXXX0000000000000000
31 through 16: Base Address.
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