SMSC LAN9311 User Manual
Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface
Datasheet
SMSC LAN9311/LAN9311i
61
Revision 1.4 (08-19-08)
DATASHEET
. Pause frames are consumed by the MAC and not sent to
the switch engine. Non-pause control frames are optionally filtered or forwarded.
When the receive FIFO is full and additional data continues to be received, an overrun condition occurs
and the frame is discarded (FIFO space recovered) or marked as a bad frame.
and the frame is discarded (FIFO space recovered) or marked as a bad frame.
The receive MAC can be disabled from receiving all frames by clearing the RX Enable bit of the
.
The size of the RX FIFO is 256 bytes. If a bad packet with less than 64 bytes is received, it will be
flushed from the FIFO automatically and the FIFO space recovered. Packets equal to or larger than
64 bytes with an error will be marked and reported to the switch engine. The switch engine will
subsequently drop the packet.
flushed from the FIFO automatically and the FIFO space recovered. Packets equal to or larger than
64 bytes with an error will be marked and reported to the switch engine. The switch engine will
subsequently drop the packet.
6.3.1.1
Receive Counters
The receive MAC gathers statistics on each packet and increments the related counter registers. The
following receive counters are supported for each switch fabric port. Refer to
following receive counters are supported for each switch fabric port. Refer to
and
through
for detailed descriptions of these counters.
Total undersized packets (
)
Total packets 64 bytes in size (
Total packets 65 through 127 bytes in size (
)
Total packets 128 through 255 bytes in size (
)
Total packets 256 through 511 bytes in size (
)
Total packets 512 through 1023 bytes in size (
)
Total packets 1024 through maximum bytes in size (
Total oversized packets (
)
Total OK packets (
)
Total packets with CRC errors (
Total multicast packets (
)
Total broadcast packets (
Total MAC Pause packets (
Total fragment packets (
)
Total jabber packets (
Total alignment errors (
)
Total bytes received from all packets (
Total bytes received from good packets (
)
Total packets with a symbol error (
)
Total MAC control packets (
)