LAN9353 Datasheet, PDF (268/523 Pages) Microchip Technology – Interfaces at up to 200Mbps via Turbo MII

LAN9353
10.7.2.17 Port x MAC Receive Jabber Error Count Register (MAC_RX_JABB_CNT_x)
Register #:
Port0: 041Eh
Port1: 081Eh
Port2: 0C1Eh
Size:
32 bits
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.
Bits
Description
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 the Jumbo2K bit 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 100 Mbps 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) and contains a FCS error is not considered jabber and is not counted here.
10.7.2.18 Port x MAC Receive Alignment Error Count Register (MAC_RX_ALIGN_CNT_x)
Register #:
Port0: 041Fh
Port1: 081Fh
Port2: 0C1Fh
Size:
32 bits
This register provides a counter of received packets with 64 bytes to the maximum allowable and a FCS error. The
counter is cleared upon being read.
Bits
Description
31:0 RX Alignment
Count of packets that have between 64 bytes and the maximum allowable
number of bytes and are not byte aligned and have a bad FCS. The max
number of bytes is 1518 for untagged packets and 1522 for tagged packets. If
the Jumbo2K bit 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 100 Mbps is approximately 481 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) and a FCS error is considered an alignment error and is counted.
DS00001925A-page 268
 2015 Microchip Technology Inc.