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P R E L I M I N A R Y
AMD
67Am79C930
Am79C930 Device ISA Plug And Play Mode I/O MAP
Physical
ISA SIR1 Resource Location of
Resource Name Mnemonic I/O address Bits [2:0] Size Resource
SIR0: General SIR0: GCR IOBA*+0000h XXX** 1 byte BIU
Configuration Register
SIR1: Bank Switching SIR1: BSS IOBA+0001h XXX 1 byte BIU
Select Register
SIR2: Local Memory SIR2: LMAL IOBA+0002h XXX 1 byte BIU
Address [7:0]
SIR3: Local Memory SIR3: LMAU IOBA+0003h XXX 1 byte BIU
Address [14:8]
SIR4: I/O Data Port [7:0] SIR4: DPLL IOBA+0004h XXX 1 byte Indirect access
to SRAM or
Flash memory
SIR5: I/O Data Port [15:8] SIR5: DPLM IOBA+0005h XXX 1 byte Indirect access
to SRAM or
Flash memory
SIR6: I/O Data Port SIR6: DPUM IOBA+0006h XXX 1 byte indirect access
[23:16] to SRAM or
Flash memory
SIR7: I/O Data Port [31:24] SIR7: DPUU IOBA+0007h XXX 1 byte Indirect access
to SRAM or
Flash memory
TIR 0–7 – IOBA+0008h – 000 1 byte TAI
IOBA+000Fh each location
TIR 8–15 – IOBA+0008h – 001 1 byte TAI
IOBA+000Fh each location
TIR 16–23 – IOBA+0008h – 010 1 byte TAI
IOBA+000Fh each location
TIR 24–31 – IOBA+0008h – 011 1 byte TAI
IOBA+000Fh each location
Device does not respond – IOBA+0010h – 0XX NA na
to these accesses IOBA+0027h
Impossible programming of na na 1XX NA na
SIR1 bits (SIR1[2] = 0
always in ISA Plug
and Play mode)
Plug and Play ADDRESS PPA 0279h (fixed) XXX 1 byte BIU
Auto-Configuration Port (write only)
Plug and Play WRITE_DATA PPWD 0A79h (fixed) XXX 1 byte BIU
Auto-Configuration Port (write only)
Plug and Play READ_DATA PPRD 0203h – 03FFh XXX 1 byte Indirect access
Auto-Configuration Port (relocatable) to ISA Plug and
(READ ONLY) Play register set
*IOBA = ISA Plug and Play I/O Base Address
**X = Don’t Care