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LAN9312 Datasheet(PDF) 341 Page - SMSC Corporation

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
Logo SMSC - SMSC Corporation

LAN9312 Datasheet(HTML) 341 Page - SMSC Corporation

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High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
SMSC LAN9312
341
Revision 1.2 (04-08-08)
DATASHEET
14.5.2.19
Port x MAC Receive Packet Length Count Register (MAC_RX_PKTLEN_CNT_x)
This register provides a counter of total bytes received. The counter is cleared upon being read.
Note:
If necessary, for oversized packets, the packet is either truncated at 1518 bytes (untagged,
Jumbo2K=0), 1522 bytes (tagged, Jumbo2K=0), or 2048 bytes (Jumbo2K=1). If this occurs,
the byte count recorded is 1518, 1522, or 2048, respectively. The Jumbo2K bit is located in
the Port x MAC Receive Configuration Register (MAC_RX_CFG_x).
Note:
A bad packet is one that has an FCS or Symbol error. For this counter, a packet that is not an
integral number of bytes (e.g. a 1518 1/2 byte packet) is rounded down to the nearest byte.
Register #:
Port0: 0420h
Size:
32 bits
Port1: 0820h
Port2: 0C20h
BITS
DESCRIPTION
TYPE
DEFAULT
31:0
RX Bytes
Count of total bytes received (including bad packets).
Note:
This counter will stop at its maximum value of FFFF_FFFFh.
Minimum rollover time at 100Mbps is approximately 5.8 hours.
RC
00000000h



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