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