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Intel
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82575EB Gigabit Ethernet Controller — Single Collision Count - SCC (04014h; RC)
Intel
®
82575EB Gigabit Ethernet Controller 324632-003
Software Developer’s Manual and EEPROM Guide Revision: 2.1
418 January 2011
14.9.6 Single Collision Count - SCC (04014h; RC)
This register counts the number of times that a successfully transmitted packet encountered a single
collision. This register only increments if transmits are enabled and the 82575 is in half-duplex mode.
14.9.7 Excessive Collisions Count - ECOL (04018h; RC)
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. This register
only increments if transmits are enabled and the 82575 is in half-duplex mode.
14.9.8 Multiple Collision Count - MCC (0401Ch; RC)
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 82575 is in half-duplex mode.
14.9.9 Late Collisions Count - LATECOL (04020h; RC)
Late collisions are collisions that occur after one slot time. This register only increments if transmits are
enabled and the 82575 is in half-duplex mode.
14.9.10 Collision Count - COLC (04028h; RC)
This register counts the total number of collisions seen by the transmitter. This register only increments
if transmits are enabled and the 82575 is in half-duplex mode. This register applies to clear as well as
secure traffic.
Field Bit(s)
Initial
Value
Description
SCC 31:0 0b Number of times a transmit encountered a single collision.
Field Bit(s)
Initial
Value
Description
ECC 31:0 0b Number of packets with more than 16 collisions.
Field Bit(s)
Initial
Value
Description
MCC 31:0 0b Number of times a successful transmit encountered multiple collisions.
Field Bit(s)
Initial
Value
Description
LCC 31:0 0b Number of packets with late collisions.
Field Bit(s)
Initial
Value
Description
CCC 31:0 0b Total number of collisions experienced by the transmitter.