zl50411 Zarlink Semiconductor, zl50411 Datasheet - Page 61

• Manufacturer Part Number: zl50411
• Description: Managed 9-port Fast Ethernet Switch With Private Vlan
• Manufacturer: Zarlink Semiconductor

11.4.1.11
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.
Use ZL50411 counter “Collision”, C[25].
11.4.1.12
Six different size groups – one counter for each. Counts both good and bad packets.
Pkts64Octets
Pkts65to127Octets
Pkts128to255Octets
Pkts256to511Octets
Pkts512to1023Octets
Pkts1024to1518Octets
Note: the ZL50411 doesn’t include bad frames in the above counters.
11.5
In addition to the statistics groups defined in previous sections, the ZL50411 has other statistics counters for its own
purposes.
1. Flow control – one counting the number of flow control frames received, C[9], and another counting the number
2. Frames sent – one for unicast frames sent, C[1], and one for non-unicast frames sent, C[4]. A broadcast or mul-
3. A counter called “frame send fail”, C[2]. This keeps track of FIFO under-runs, late collisions, and collisions that
4. A counter called “filtering”, C[27]. This keeps track of all frames dropped due to queue congestion (i.e. egress
of flow control frames sent, C[3].
ticast frame qualifies as non-unicast.
have occurred 16 times.
WRED).
Miscellaneous Counters
Collisions
Packet Count for Different Size Groups
Frame size:
for any packet with size = 64 bytes.
Use ZL50411 counter “Frames with Length of 64 Bytes”, C[12].
for any packet with size from 65 bytes to 127 bytes
Use ZL50411 counter “Frames with Length Between 65-127 Bytes”, C[14].
or any packet with size from 128 bytes to 255 bytes
Use ZL50411 counter “Frames with Length Between 128-255 Bytes”, C[16].
for any packet with size from 256 bytes to 511 bytes
Use ZL50411 counter “Frames with Length Between 256-511 Bytes”, C[17].
for any packet with size from 512 bytes to 1023 bytes
Use ZL50411 counter “Frames with Length Between 512-1023 Bytes”, C[18].
for any packet with size from 1024 bytes to 1518 bytes
Use ZL50411 counter “Frames with Length Between 1024-1518 Bytes”, C[19].
Note: the ZL50411 will include frames up to max. frame size.
Zarlink Semiconductor Inc.
ZL50411
61
Min. Frame Size
any size
Max. Frame Size
Data Sheet