KSZ8842-16MBL-EVAL MICREL [Micrel Semiconductor], KSZ8842-16MBL-EVAL Datasheet - Page 99

• Manufacturer Part Number: KSZ8842-16MBL-EVAL
• Description: 2-Port Ethernet Switch with Non-PCI Interface
• Manufacturer: MICREL [Micrel Semiconductor]

Bank 48 Port 1 Control Register 1 (0x00): P1CR1
This register contains the global per port control for the switch function.
Micrel, Inc.
Bit
15-8
7
6
5
4-3
2
1
0
October 2007
Default
0x00
0
0
0
0x0
0
0
0
R/W
RO
RW
RW
RW
RW
RW
RW
RW
Description
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 the port.
0 = disable DiffServ function.
802.1p Priority Classification Enable
1= enable 802.1p priority classification for ingress packets on the port.
0 = disable 802.1p.
Port-Based Priority Classification
00 - ingress packets on port are classified as priority 0 queue if “DiffServ” or “802.1p”
classification is not enabled or fails to classify.
01 - ingress packets on port are classified as priority 1 queue if “DiffServ” or “802.1p”
classification is not enabled or fails to classify.
10 - ingress packets on port are classified as priority 2 queue if “DiffServ” or “802.1p”
classification is not enabled or fails to classify.
11 - ingress packets on port are 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 adds 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 removes 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.
99
KSZ8842-16/32 MQL/MVL/MVLI/MBL
M9999-102207-1.9