ZL50400GDC ZARLINK [Zarlink Semiconductor Inc], ZL50400GDC Datasheet - Page 52

Manufacturer Part Number

ZL50400GDC

Description

Lightly Managed/Unmanaged 9-Port 10/100 M Ethernet Switch

Manufacturer

ZARLINK [Zarlink Semiconductor Inc]

Datasheet

1.ZL50400GDC.pdf (124 pages)

11.4.1.10

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.

11.4.1.11

Six different size groups – one counter for each:

Pkts64Octets

Pkts65to127Octets

Pkts128to255Octets

Pkts256to511Octets

Pkts512to1023Octets

Pkts1024to1518Octets

Counts both good and bad packets.

11.5

In addition to the statistics groups defined in previous sections, the ZL50400 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:

Miscellaneous Counters

Packet Count for Different Size Groups

Collisions

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 256 bytes to 511 bytes

for any packet with size from 512 bytes to 1023 bytes

for any packet with size from 1024 bytes to 1518 bytes

(to 1522 with VLAN tag; to BUF_LIMIT if enabled for this port)

Zarlink Semiconductor Inc.

any size

ZL50400

Data Sheet