Intel PCI User Manual
340
Software Developer’s Manual
Register Descriptions
Table 13-98. SCC Register Bit Description
13.7.7
Excessive Collisions Count
ECOL (04018h; R)
When 16 or more collisions have occurred on a packet, this register increments, regardless of the
value of collision threshold. If collision threshold is set below 16, this counter won’t increment.
value of collision threshold. If collision threshold is set below 16, this counter won’t increment.
This register only increments if transmits are enabled and the Ethernet controller is in half-duplex
mode.
Table 13-99. ECOL Register Bit Description
13.7.8
Multiple Collision Count
MCC (0401Ch; R)
This register counts the number of times that a transmit encountered more than one collision but
less than 16. This register only increments if transmits are enabled and the Ethernet controller is in
half-duplex mode.
half-duplex mode.
31
0
SCC
Field
Bit(s)
Initial
Value
Value
Description
SCC
31:0
0b
Number of times a transmit encountered a single collision.
31
0
ECC
Field
Bit(s)
Initial
Value
Value
Description
ECC
31:0
0b
Number of packets with more than 16 collisions.