LAN9312 Datasheet, PDF (334/458 Pages) SMSC Corporation – High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface

High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
14.5.2.12 Port x MAC Receive CRC Error Count Register (MAC_RX_CRCERR_CNT_x)
Register #:
Port0: 0419h
Port1: 0819h
Port2: 0C19h
Size:
32 bits
This register provides a counter of received packets that with CRC errors. The counter is cleared upon
being read.
BITS
DESCRIPTION
31:0 RX CRC
Count of packets that have between 64 and the maximum allowable number
of bytes and have a bad FCS, but do not have an extra nibble. 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 137 hours.
TYPE
RC
DEFAULT
00000000h
Revision 1.2 (04-08-08)
334
DATASHEET
SMSC LAN9312