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Intel
®
82575EB Gigabit Ethernet Controller — Packets Received (512-1023 Bytes) Count -
PRC1023 (0406Ch; RC)
Intel
®
82575EB Gigabit Ethernet Controller 324632-003
Software Developer’s Manual and EEPROM Guide Revision: 2.1
422 January 2011
14.9.23 Packets Received (512-1023 Bytes) Count -
PRC1023 (0406Ch; RC)
This register counts the number of good packets received that are 512-1023 bytes (from <Destination
Address> through <CRC>, inclusively) in length. Packets that are counted in the Missed Packet Count
register are not counted in this register. Packets sent to the manageability engine are included in this
counter. This register does not include received flow control packets and increments only if receives are
enabled.
14.9.24 Packets Received (1024 to Max Bytes) Count -
PRC1522 (04070h; RC)
This register counts the number of good packets received that are from 1024 bytes to the maximum
(from <Destination Address> through <CRC>, inclusively) in length. The maximum is dependent on
the current receiver configuration (for example, LPE, etc.) and the type of packet being received. If a
packet is counted in Receive Oversized Count, it is not counted in this register (see Section 14.9.34).
This register does not include received flow control packets and only increments if the packet has
passed address filtering and receives are enabled. Packets sent to the manageability engine are
included in this counter.
Due to changes in the standard for maximum frame size for VLAN tagged frames in 802.3, the 82575
accepts packets that have a maximum length of 1522 bytes. The RMON statistics associated with this
range has been extended to count 1522 byte long packets. If CTRL.Extended_VLAN is set, packets up
to 1526 bytes are counted by this counter.
14.9.25 Good Packets Received Count - GPRC (04074h;
RC)
This register counts the number of good packets received of any legal length. The legal length for the
received packet is defined by the value of Long Packet Enable (CTRL.LPE) (see Section 14.9.34). This
register does not include received flow control packets and only counts packets that pass filtering. This
register only increments if receives are enabled. This register does not count packets counted by the
Missed Packet Count (MPC) register. Packets sent to the manageability engine are included in this
counter.
Note: GPRC can count packets interrupted by a link disconnect although they have a CRC error.
Field Bit(s)
Initial
Value
Description
PRC511 31:0 0b Number of packets received that are 256-511 bytes in length.
Field Bit(s)
Initial
Value
Description
PRC1023 31:0 0b Number of packets received that are 512-1023 bytes in length.
Field Bit(s)
Initial
Value
Description
PRC1522 31:0 0b Number of packets received that are 1024-Max bytes in length.