SMSC LAN9311 User Manual
Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface
Datasheet
Revision 1.4 (08-19-08)
340
SMSC LAN9311/LAN9311i
DATASHEET
14.5.2.17
Port x MAC Receive Jabber Error Count Register (MAC_RX_JABB_CNT_x)
This register provides a counter of received packets with greater than the maximum allowable number
of bytes and a FCS error. The counter is cleared upon being read.
of bytes and a FCS error. 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) and contains a FCS error is not considered jabber and is
not counted here.
bytes (e.g. a 1518 1/2 byte packet) and contains a FCS error is not considered jabber and is
not counted here.
Register #:
Port0: 041Eh
Size:
32 bits
Port1: 081Eh
Port2: 0C1Eh
Port2: 0C1Eh
BITS
DESCRIPTION
TYPE
DEFAULT
31:0
RX Jabber
Count of packets that have more than the maximum allowable number of
bytes and a FCS error. The max number of bytes is 1518 for untagged
packets and 1522 for tagged packets. If Jumbo2K (bit 3) is set in the
Count of packets that have more than the maximum allowable number of
bytes and a FCS error. The max number of bytes is 1518 for untagged
packets and 1522 for tagged packets. If Jumbo2K (bit 3) is set in the
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.
Minimum rollover time at 100Mbps is approximately 8813 hours.
RC
00000000h