Parameter Definitions
11
3
Defining the Current Status
The read-only parameters described in Table 3-2 explain the operational mode
of the interface. These parameters define the current status.
Inter-Packet Gap Parameters
The Fast Ethernet Parallel Port SCSI (FEPS) ASIC supports 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 3-3 lists the default values and allowable values for the inter-packet gap
(IPG) parameters,
ipg1
and
ipg2
.
Table 3-2
Read-Only Parameters Defining the Current Status
Parameter
Values
Description
transceiver_inuse
0
1
= Internal transceiver
= External transceiver
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
Table 3-3
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)
