Data Sheet

Programming Interface — Ethernet Controller I210
491
The FCRUC counter increments when a flow control packet is received that matches either the reserved
flow control multicast address (in the FCAH/L register) or the MAC station address, and has a matching
flow control type field match (value in the FCT register), but has an incorrect op-code field. This register
only increments if receives are enabled (RCTL.RXEN is set).
Note: When the RCTL.PMCF bit is set to 1b then the FCRUC counter increments after receiving
packets that don’t match standard address filtering.
8.18.20 Packets Received [64 Bytes] Count - PRC64 (0x405C; RC)
This register counts the number of good packets received that are exactly 64 bytes (from <Destination
Address> through <CRC>, inclusive) 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 (RCTL.RXEN is set).
8.18.21 Packets Received [65–127 Bytes] Count - PRC127 (0x4060; RC)
This register counts the number of good packets received that are 65-127 bytes (from <Destination
Address> through <CRC>, inclusive) 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 (RCTL.RXEN is set).
8.18.22 Packets Received [128–255 Bytes] Count - PRC255 (0x4064; RC)
This register counts the number of good packets received that are 128-255 bytes (from <Destination
Address> through <CRC>, inclusive) 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 (RCTL.RXEN is set).
Field Bit(s) Initial Value Description
FCRUC 31:0 0x0 Number of unsupported flow control frames received.
Field Bit(s) Initial Value Description
PRC64 31:0 0x0 Number of packets received that are 64 bytes in length.
Field Bit(s) Initial Value Description
PRC127 31:0 0x0 Number of packets received that are 65-127 bytes in length.
Field Bit(s) Initial Value Description
PRC255 31:0 0x0 Number of packets received that are 128-255 bytes in length.