zl50411 Zarlink Semiconductor, zl50411 Datasheet - Page 60

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

11.4.1.8
Counts number of frames received with size exceeding the maximum allowable frame size.
Use ZL50411 counter “Oversize Frames”, C[15].
Note: max. frame size may be BUF_LIMIT, if enabled on this port.
11.4.1.9
Counts number of frames received with size less than 64 bytes and with bad FCS.
Use ZL50411 counter “Fragments”, C[20].
11.4.1.10
Counts number of frames received with size exceeding maximum frame size and with bad FCS.
Note that this definition of jabber is different than the definition in IEEE 802.3 (this standard defines jabber as the
condition where any packet exceeds Jabber Lockup Protection Timer (TW3)).
No ZL50411 counter.
Note: the ZL50411 defines a jabber frame as any frame that exceeds 6400 bytes, however, the maximum buffer
size supported by the device is 4 KBytes. Thus, any frame > 4 KB would be counted as an Oversized Frame, C[15].
OversizePkts
Fragments
Jabbers
Frame size:
Framing error: don’t care
FCS error: don’t care
No collisions
Frame size:
Framing error and/or FCS error
No collisions
Frame size:
Framing error: don’t care
FCS error
No collisions
Zarlink Semiconductor Inc.
ZL50411
60
Min. Frame Size
n/a
Min. Frame Size
n/a
Min. Frame Size
n/a
Max. Frame Size
> 1518 bytes
(> 1522 bytes, if
VLAN tagged)
Max. Frame Size
< 64 bytes
Max. Frame Size
> 1518 bytes
(> 1522 bytes, if
VLAN tagged)
Data Sheet