LAN9312 datasheet(332/458 Pages) SMSC

Part #	LAN9312

Description	High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface

PDF	458 Pages

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Manufacturer	SMSC [SMSC Corporation]

Direct Link	http://www.smsc.com

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High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface

Datasheet

Revision 1.2 (04-08-08)

332

SMSC LAN9312

DATASHEET

14.5.2.10

Port x MAC Receive Oversize Count Register (MAC_RX_OVRSZE_CNT_x)

This register provides a counter of received packets with a size greater than the maximum byte size.

The counter is cleared upon being read.

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.

Port0: 0417h

Size:

32 bits

Port1: 0817h

Port2: 0C17h

BITS

DESCRIPTION

TYPE

DEFAULT

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.

00000000h

LAN9312 Datasheet(PDF) 332 Page - SMSC Corporation