Specifications

17 January 1997 – Subject to Change
I/O Space Address Maps B–5
PCI Sparse I/O Space
B.2.1.2 Flash ROM Segment Select Register
The flash ROM is partitioned into two 512KB segments. The segments are selected
by flash_adr19. To select the first 512KB segment, write a value of 0 to ISA port
address 0x800
16
. To access the second 512KB segment, write a value of 1 to this
register.
Table B–2 lists the register address for the flash ROM segment select register. This
register is write-only. Refer to Section B.3.1 for dense space flash ROM memory
addresses.
B.2.1.3 Configuration Jumpers (CF0–CF7)
Reading the addresses listed in Table B–3 returns the value of the configuration
jumpers CF0 through CF7.
A 85.8000.0E00 Register A
B 85.8000.0E00 Register B
C 85.8000.0E00 Register C
D 85.8000.0E00 Register D
Table B–2 Flash ROM Segment Select Register
Offset Physical Address Register
x800 85.8001.0000 Flash ROM segment select
Table B–3 Configuration Jumpers (CF0-CF7)
Offset Physical Address Description
x801 85.8001.0020 Bits <7:0> are CF<7:0>.
Table B–1 (Continued) Combination Controller Register Address Space Map
Address Offset
Read/Write Physical Address Register