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62 Intel 8255x 10/100 Mbps Ethernet Controller Family Open Source Software Developer Manual
Host Software Interface
The individual bit fields of the configure command is another area where there are numerous
differences between the controllers (82557, 82558, 82559, etc.). Therefore, a complete
configuration map for each device will be presented below. Bit descriptions for the configuration
bits follow the configuration map.
Figure 17. Configure Command Format
Offset Command Word Bits 31:16 Status Word Bits 15:0
00h EL S I 0000000000 010 C X OK XXXXXXXXXXXXX
04h Link Address (A31:A0)
08h Byte 3 Byte 2 Byte 1 Byte 0
0Ch Byte 7 Byte 6 Byte 5 Byte 4
10h Byte 11 Byte 10 Byte 9 Byte 8
14h Byte 15 Byte 14 Byte 13 Byte 12
18h Byte 19 Byte 18 Byte 17 Byte 16
1Ch 00 00 00 00 00 00 00 00 Byte 21 Byte 20
Table 38. 82557 Configuration Byte Map
Byte D7 D6 D5 D4 D3 D2 D1 D0
0 0 0 Byte Count
1 0 Transmit FIFO Limit Receive FIFO Limit
2 Adaptive Interframe Spacing
3 Reserved (must be set to 0)
4 0 Receive DMA Maximum Byte Count
5
DMBC
Enable
Transmit DMA Maximum Byte Count
6
Save Bad
Frames
Discard
Overrun
Receive
11
CI
Interrupt
TNO
Interrupt
1 Late SCB
700000Underrun Retry
Discard
Short
Receive
80000000503/MII
900000000
10 Loopback Preamble Length NSAI 1 1 0
1100000Linear Priority
12 Interframe Spacing 0 0 0
L PRI
MODE
1300000000
1411110010
15
CRS and
CDT
10010
Broadcast
Disable
Promis-
cuous
1600000000
1701000000