AM79C976 Advanced Micro Devices, AM79C976 Datasheet - Page 109

• Manufacturer Part Number: AM79C976
• Description: PCnet-PRO 10/100 Mbps PCI Ethernet Controller
• Manufacturer: Advanced Micro Devices

8/01/00
Table 24. I/O Map In DWord I/O Mode (DWIO = 1)
200h-2FFh
20h-1FFh
00h - 0Fh
AD[4:0]
0XX00
0XX01
0XX10
0XX11
0XX00
0XX10
0XX00
0XX10
10000
10010
10100
10110
10000
10010
10100
10110
10000
Offset
1Ch
10h
14h
18h
No. of Bytes
BE[3:0]
224
256
1110
1101
1011
0111
1100
0011
1100
0011
1100
0011
1100
0011
1100
0011
1100
0011
0000
16
4
4
4
4
Table 23. Legal I/O Accesses in Word I/O Mode (DWIO = 0)
RDP
RAP (shared by RDP and
BDP)
Reset Register
BDP
MIB Counters
APROM
Memory-mapped Registers
Type
WR
WR
WR
WR
WR
WR
WR
RD
RD
RD
RD
RD
RD
RD
RD
RD
RD
Register
Byte read of APROM location 0h, 4h, 8h or Ch
Byte read of APROM location 1h, 5h, 9h or Dh
Byte read of APROM location 2h, 6h, Ah or Eh
Byte read of APROM location 3h, 7h, Bh or Fh
Word read of APROM locations 1h (MSB) and 0h (LSB), 5h and 4h, 8h and 9h or
Ch and Dh
Word read of APROM locations 3h (MSB) and 2h (LSB), 7h and 6h, Bh and Ah or
Fh and Eh
Word read of RDP
Word read of RAP
Word read of Reset Register
Word read of BDP
Word write to APROM locations 1h (MSB) and 0h (LSB), 5h and 4h, 8h and 9h or
Ch and Dh
Word write to APROM locations 3h (MSB) and 2h (LSB), 7h and 6h, Bh and Ah or
Fh and Eh
Word write to RDP
Word write to RAP
Word write to Reset Register
Word write to BDP
DWord write to RDP,
switches device to DWord I/O mode
P R E L I M I N A R Y
Am79C976
Table 25. Legal I/O Accesses in Double Word I/O
AD[4:0]
0XX00
0XX00
10000
10100
11000
10000
Comment
0000
0000
0000
0000
0000
0000
[3:0]
Mode (DWIO =1)
Type
WR
WR
WR
WR
RD
RD
DWord read of APROM
locations 3h (MSB) to 0h
(LSB),
7h to 4h, Bh to 8h or Fh to
Ch
DWord write to APROM
locations 3h (MSB) to 0h
(LSB),
7h to 4h, Bh to 8h or Fh to
Ch
DWord write to RDP
DWord write to RAP
DWord write to Reset
Register
DWord read of RDP
Comment
109