am79c972b Advanced Micro Devices, am79c972b Datasheet - Page 94

• Manufacturer Part Number: am79c972b
• Description: Pcnet?-fast+ Enhanced 10/100 Mbps Pci Ethernet Controller With Onnow Support
• Manufacturer: Advanced Micro Devices

94
Table 19. I/O Map In DWord I/O Mode (DWIO = 1)
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]
1110
1101
1011
0111
1100
0011
1100
0011
1100
0011
1100
0011
1100
0011
1100
0011
0000
16
4
4
4
4
Table 18. Legal I/O Accesses in Word I/O Mode (DWIO = 0)
RAP (shared by RDP and
Type
WR
WR
WR
WR
WR
WR
WR
RD
RD
RD
RD
RD
RD
RD
RD
RD
RD
Reset Register
Register
APROM
BDP)
RDP
BDP
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
Am79C972
Table 20. Legal I/O Accesses in Double Word I/O
AD[4:0]
0XX00
0XX00
10000
10100
11000
10000
10100
11000
Comment
BE[3:0]
0000
0000
0000
0000
0000
0000
0000
0000
Mode (DWIO =1)
Type
WR
WR
WR
WR
RD
RD
RD
RD
DWord read of APROM
locations 3h (MSB) to 0h
(LSB),
7h to 4h, Bh to 8h or Fh to
Ch
DWord read of RDP
DWord read of RAP
DWord read of Reset
Register
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
Comment