LAN9313 Datasheet, PDF (277/398 Pages) SMSC Corporation – Three Port 10/100 Managed Ethernet Switch with MII

Three Port 10/100 Managed Ethernet Switch with MII
Datasheet
13.3.2.10 Port x MAC Receive Oversize Count Register (MAC_RX_OVRSZE_CNT_x)
Register #:
Port0: 0417h
Port1: 0817h
Port2: 0C17h
Size:
32 bits
This register provides a counter of received packets with a size greater than the maximum byte size.
The counter is cleared upon being read.
BITS
DESCRIPTION
31:0 RX Oversize
Count of packets that have more than the maximum allowable number of
bytes and a valid FCS. The max number of bytes is 1518 for untagged
packets and 1522 for tagged packets. If Jumbo2K (bit 3) is set in the Port x
MAC Receive Configuration Register (MAC_RX_CFG_x), the max number
of bytes is 2048.
Note: This counter will stop at its maximum value of FFFF_FFFFh.
Minimum rollover time at 100Mbps is approximately 8813 hours.
TYPE
RC
DEFAULT
00000000h
Note: For this counter, a packet with the maximum number of bytes that is not an integral number of
bytes (e.g. a 1518 1/2 byte packet) is not considered oversize.
SMSC LAN9313/LAN9313i
277
DATASHEET
Revision 1.2 (04-08-08)