8101 Datasheet, PDF (104/172 Pages) LSI Computer Systems – Gigabit Ethernet Controller

APAD
IPG[2:0]
TXPRMBL
TXCRC
RXPRMBL
AutoPad Enable
10, R/W
APAD
Description
1
All undersize transmit packets padded to 64 bytes
0
No autopad
Transmit Interpacket Gap Select
[9:7], R/W
IPG[2:0] Description
111
Tranmsit IPG is 96 bits (IEEE specification
minimum)
110
Transmit IPG is 122 bits
101
Transmit IPG is 80 bits
100
Transmit IPG is 64 bits
011
Transmit IPG is 192 bits-(2 x IEEE specification
minimum)
010
Transmit IPG is 384 bits-(4 x IEEE specification
minimum)
001
Transmit IPG is 768 bits-(8 x IEEE specification
minimum)
000
Transmit IPG is 32 bits
Transmit Preamble Enable
TXPRMBL Description
6, R/W
1
Preamble added to beginning of transmit packet
0
Preamble not added
Transmit CRC Enable
5, R/W
TXCRC Description
1
CRC calculated and added to end of transmit
packet
0
CRC not added
Receive Preamble Enable
4, R/W
RXPRMBL Description
1
Preamble is stored in RX FIFO with rest of packet
0
Preamble stripped off
4-16
Registers
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