KSZ8842-PMBLAM MICREL [Micrel Semiconductor], KSZ8842-PMBLAM Datasheet - Page 54
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KSZ8842-PMBLAM
Manufacturer Part Number
KSZ8842-PMBLAM
Description
2-Port Ethernet Switch with PCI Interface
Manufacturer
MICREL [Micrel Semiconductor]
Datasheet
1.KSZ8842-PMBLAM.pdf
(119 pages)
- Current page: 54 of 119
- Download datasheet (961Kb)
Micrel, Inc.
Switch Global Control Register 2 (Offset 0x0404): SGCR2
This register contains the global control for the switch function.
October 2007
10 – 9
Bit
15
14
13
12
11
8
7
6
5
4
Default
0
0
0
0
0
0
0
1
1
1
1
R/W
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
Description
802.1Q VLAN enable
1 = 802.1Q VLAN mode is turned on. VLAN table needs to set up before
the operation.
0 = 802.1Q VLAN is disabled.
IGMP snoop enable
1 = IGMP snoop is enabled. All the IGMP packets will be forwarded to the
host port.
0 = IGMP snoop is disabled.
IPv6 MLD snooping enable
1 = enable IPv6 MLD snooping
IPv6 MLD snooping option
1 = enable IPv6 MLD snooping option.
Priority Scheme select
0 = always TX higher priority packets first
1 = Weighted Fair Queuing enable. When all 4 queues has packets
waiting to TX, the bandwidth allocation is q3:q2:q1:q0 = 8:4:2:1. If any
queues is empty, the highest non-empty queue will get one more
weighting. For example, if q2 is empty, q3:q2:q1:q0 will become (8+1): 0
:2 : 1.
Reserved.
For factory test purposes only. Always write 0.
Sniff mode select
1 = will do RX AND TX sniff (both source port and destination port need to
match)
0 = will do RX OR TX sniff (Either source port or destination port needs to
match). This is the mode used to implement rx only sniff.
Unicast port-VLAN mismatch discard
1 = all packets can not cross VLAN boundary
0 = unicast packets (excluding unknown/multicast/broadcast) can cross
VLAN boundary
Multicast storm protection disable
1 = “Broadcast Storm Protection” does not include multicast packets. Only
DA = FFFFFFFFFFFF packets will be regulated.
0 = “Broadcast Storm Protection” includes DA = FFFFFFFFFFFF and
DA[40] = 1 packets.
Back pressure mode
1 = carrier sense based backpressure is selected
0 = collision based backpressure is selected
Flow control and back pressure fair mode
1 = fair mode is selected. In this mode, if a flow control port and a non-
flow control port talk to the same destination port, packets from the non-
flow control port may be dropped. This is to prevent the flow control port
from being flow controlled for an extended period of time.
0 = in this mode, if a flow control port and a non-flow control port talk to
the same destination port, the flow control port will be flow controlled.
This may not be “fair” to the flow control port.
54
KSZ8842-PMQL/PMBL
M9999-100207-1.5
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