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Sheet目录3878

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Micrel, Inc.

KSZ8842-PMQL/PMBL

October 2007

M9999-100207-1.5

Port 1 Control Register 1 (Offset 0x0500): P1CR1

This register contains the global per port control for the switch port 1 function.

Bit

Default

R/W

Description

15 – 8

0x00

Reserved

Broadcast storm protection enable

1 = enable broadcast storm protection for ingress packets on the port

0 = disable broadcast storm protection

Diffserv priority classification enable

1 = enable diffserv priority classification for ingress packets on port

0 = disable diffserv function

802.1p priority classification enable

1 = enable 802.1p priority classification for ingress packets on port

0 = disable 802.1p

4:3

Port based priority classification

00 = ingress packets on port 1 will be classified as priority 0 queue if

“Diffserv” or “802.1p” classification is not enabled or fails to classify.

01 = ingress packets on port 1 will be classified as priority 1 queue if

“Diffserv” or “802.1p” classification is not enabled or fails to classify.

10 = ingress packets on port 1 will be classified as priority 2 queue if

“Diffserv” or “802.1p” classification is not enabled or fails to classify.

11 = ingress packets on port 1 will be classified as priority 3 queue if

“Diffserv” or “802.1p” classification is not enabled or fails to classify.

Note: “Diffserv”, “802.1p” and port priority can be enabled at the same

time. The OR’ed result of 802.1p and DSCP overwrites the port priority.

Tag insertion

1 = when packets are output on the port, the switch will add 802.1p/q tags

to packets without 802.1p/q tags when received. The switch will not add

tags to packets already tagged. The tag inserted is the ingress port’s

“port VID”.

0 = disable tag insertion

Tag removal

1 = when packets are output on the port, the switch will remove 802.1p/q

tags from packets with 802.1p/q tags when received. The switch will not

modify packets received without tags.

0 = disable tag removal

TX Multiple Queues Select Enable

1 = the port output queue is split into four priority queues.

0 = single output queue on the port. There is no priority differentiation

even though packets are classified into high or low priority.

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