Data Sheet

Programming Interface — Ethernet Controller I210
495
8.18.35 Receive Undersize Count - RUC (0x40A4; RC)
This register counts the number of received frames that passed address filtering, and were less than
minimum size (64 bytes from <Destination Address> through <CRC>, inclusive), and had a valid CRC.
This register only increments if receives are enabled (RCTL.RXEN is set). Packets sent to the
manageability engine are included in this counter.
Note: Runt packets smaller than 25 bytes cannot be counted by this counter.
8.18.36 Receive Fragment Count - RFC (0x40A8; RC)
This register counts the number of received frames that passed address filtering, and were less than
minimum size (64 bytes from <Destination Address> through <CRC>, inclusive), but had a bad CRC
(this is slightly different from the Receive Undersize Count register). This register only increments if
receives are enabled (RCTL.RXEN is set). Packets sent to the manageability engine are included in this
counter.
Note: Runt packets smaller than 25 bytes cannot be counted by this counter.
8.18.37 Receive Oversize Count - ROC (0x40AC; RC)
This register counts the number of received frames with valid CRC field that passed address filtering,
and were greater than maximum size. For definition of oversized packets, refer to Section 7.1.1.4.
If receives are not enabled, this register does not increment. These lengths are based on bytes in the
received packet from <Destination Address> through <CRC>, inclusive. Packets sent to the
manageability engine are included in this counter.
8.18.38 Receive Jabber Count - RJC (0x40B0; RC)
This register counts the number of received frames that passed address filtering, and were greater than
maximum size and had a bad CRC (this is slightly different from the Receive Oversize Count register).
For definition of oversized packets, refer to Section 7.1.1.4.
Field Bit(s) Initial Value Description
RUC 31:0 0x0 Number of receive undersize errors.
Field Bit(s) Initial Value Description
RFC 31:0 0x0 Number of receive fragment errors.
Field Bit(s) Initial Value Description
ROC 31:0 0x0 Number of receive oversize errors.