zl50411 Zarlink Semiconductor, zl50411 Datasheet - Page 55

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

11.2.1.3
Counts number of valid frames received with bad FCS.
Use ZL50411 counter “CRC”, C[23].
Note: if BUF_LIMIT is enabled on this port, this counter still uses the above max. frame size definition. If a frame
>1518B but <BUF_LIMIT has a CRC error, it will be countered as an Oversized frame.
11.2.1.4
Counts number of valid frames received with bad alignment (not byte-aligned).
Use ZL50411 counter “Alignment Error”, C[21].
Note: when this counter is incremented, the ZL50411 also increments the “CRC” counter, C[23].
11.2.1.5
Counts number of frames received with size exceeding the maximum allowable frame size.
Use ZL50411 counter “Oversize Frames”, C[15].
PortFCSErrors
PortAlignmentErrors
PortFrameTooLongs
Frame size:
No framing error
No collisions
Frame size:
Framing error
FCS error
No collisions
Frame size:
Framing error: don’t care
FCS error: don’t care
No collisions
Zarlink Semiconductor Inc.
ZL50411
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Min. Frame Size
> 64 bytes,
Min. Frame Size
> 64 bytes,
Min. Frame Size
n/a
Max. Frame Size
< 1518 bytes
(< 1522 bytes, if
VLAN tagged)
Max. Frame Size
< 1518 bytes
(< 1522 bytes, if
VLAN tagged)
Max. Frame Size
> 1518 bytes
(> 1522 bytes, if
VLAN tagged)
Data Sheet