SMSC LAN9312 - Manual (Page 352)

High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
Revision 1.4 (08-19-08) 352 SMSC LAN9312
DATASHEET
14.5.2.31 Port x MAC Transmit 256 to 511 Byte Count Register (MAC_TX_256_TO_511_CNT_x)
This register provides a counter of transmitted packets between the size of 256 to 511 bytes. The
counter is cleared upon being read.
Register #: Port0: 0457h Size: 32 bits
Port1: 0857h
Port2: 0C57h
BITS DESCRIPTION TYPE DEFAULT
31:0 TX 256 to 511 Bytes
Count of packets that have between 256 and 511 bytes.
Note: This counter will stop at its maximum value of FFFF_FFFFh.
Minimum rollover time at 100Mbps is approximately 1581 hours.
RC 00000000h