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354 Software Developer’s Manual
Register Descriptions
Table 13-127. RFC Register Bit Description
13.7.36 Receive Oversize Count
ROC (040ACh; R)
This register counts the number of received frames with valid CRC field that passed address
filtering, and were greater than maximum size. Packets over 1522 bytes are oversized if LongPack-
etEnable (RCTL.LPE) is 0b. If LongPacketEnable is 1b, then an incoming packet is considered
oversized if it exceeds 16384 bytes.
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>, inclusively.
Table 13-128. ROC Register Bit Description
13.7.37 Receive Jabber Count
RJC (040B0h; R)
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).
Packets over 1522 bytes are oversized if LongPacketEnable (RCTL.LPE) is 0b.
If LongPacketEnable is 1b, then an incoming packet is considered oversized if it exceeds 16384
bytes.
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>, inclusively.
31 0
RFC
Field Bit(s)
Initial
Value
Description
RFC 31:0 0b Number of receive fragment errors.
31 0
ROC
Field Bit(s)
Initial
Value
Description
ROC 31:0 0b Number of receive oversize errors.