FastEthernet PCI Adapter Installation & User's Guide

TABLE C–2 Read-Only Parameters Defining the Current Status
Parameter Values Description
link_status
0
1
Current link status
= Link down
= Link up
link_speed
0
1
Valid only if the link is up
= 10 Mbps
= 100 Mbps
link_mode
0
1
Valid only if the link is up
= Half duplex
= Full duplex
Inter-Packet Gap Parameters
The PCI Fast Ethernet and Expansion (PFEX) ASIC supports the programmable
Inter-Packet Gap (IPG) parameters ipg1 and ipg2. The total IPG is the sum of ipg1
and ipg2. The total IPG is 9.6 microseconds when the link speed set, by the
auto-negotiation protocol, is 10 Mbps. When the link speed is 100 Mbps, the total
IPG is 0.96 microseconds.
Table C–3 lists the default values and allowable values for the inter-packet gap (IPG)
parameters, ipg1 and ipg2.
TABLE C–3 Read-Write Inter-Packet Gap Parameter Values and Descriptions
Parameter
Values
(Byte-time)
Description
ipg1
0, 255
ipg1 = 8 (default at initialization)
ipg2
0, 255
ipg2 = 4 (default at initialization)
By default, the driver sets ipg1 to 8-byte time and ipg2 to 4-byte time, which are
the standard values. (Byte time is the time it takes to transmit one byte on the link,
with a link speed of either 100 Mbps or 10 Mbps.)
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Sun Quad FastEthernet PCI Adapter Installation and User’s Guide ♦ Revision A, August 1997