zl50408 Zarlink Semiconductor, zl50408 Datasheet - Page 55

• Manufacturer Part Number: zl50408
• Description: Managed 8-port 10/100m 1-port 10/100/1000m Ethernet Switch
• Manufacturer: Zarlink Semiconductor

12.4.1.9
Counts number of frames received with size exceeding maximum frame size and with bad FCS.
12.4.1.10
Counts number of collision events detected.
Only a best estimate since collisions can only be detected while in transmit mode, but not while in receive mode.
12.4.1.11
Six different size groups – one counter for each:
Pkts64Octets
Pkts65to127Octets
Pkts128to255Octets
Pkts256to511Octets
Pkts512to1023Octets
Pkts1024to1518Octets
Counts both good and bad packets.
12.5
In addition to the statistics groups defined in previous sections, the ZL50408 has other statistics counters for its own
purposes. We have two counters for flow control – one counting the number of flow control frames received, and
another counting the number of flow control frames sent. We also have two counters, one for unicast frames sent,
and one for non-unicast frames sent. A broadcast or multicast frame qualifies as non-unicast. Furthermore, we
have a counter called “frame send fail.” This keeps track of FIFO under-runs, late collisions, and collisions that have
occurred 16 times.
Frame size:
Framing error
No collisions
Frame size:
Miscellaneous Counters
Jabbers
Packet Count for Different Size Groups
Collisions
for any packet with size from 256 bytes to 511 bytes
for any packet with size from 512 bytes to 1023 bytes
for any packet with size = 64 bytes
for any packet with size from 65 bytes to 127 bytes
or any packet with size from 128 bytes to 255 bytes
for any packet with size from 1024 bytes to 1518 bytes
Zarlink Semiconductor Inc.
> 1522 bytes if VLAN Tagged;
(> 1518 bytes if not VLAN Tagged)
don’t care
any size
ZL50408
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Data Sheet