KSZ8842-16MVL TR Micrel, KSZ8842-16MVL TR Datasheet - Page 74

• Manufacturer Part Number: KSZ8842-16MVL TR
• Description: Ethernet ICs 2-Port Ethernet Switch/Repeater + Generic (8, 16-bit) bus interface(Lead Free)
• Manufacturer: Micrel

Specifications of KSZ8842-16MVL TR

• Rohs: yes
• Product: Ethernet Switches
• Package / Case: PQFP-128
• Mounting Style: SMD/SMT

Bank 32 Switch Global Control Register 2 (0x04): SGCR2
This register contains the global control for the switch function.
Micrel, Inc.
Bit
10
9
8
7-4
3
2-1
0
Bit
15
14
13
12
11
10-9
8
October 2007
Default
1
0
0
-
0x0
-
0
Default
0
0
0
0
0
0
0x0
R/W
RW
RW
RW
RW
RW
RW
RW
R/W
RW
RW
RW
RW
RW
RW
RW
Description
Aging Enable
1 = enable age function in the chip.
0 = disable age function in the chip.
Fast Age Enable
1 = turn on fast age (800us).
Aggressive Back-Off Enable
1 = enable more aggressive back off algorithm in half-duplex mode to enhance
performance. This is not an IEEE standard.
Reserved
Pass Flow Control Packet
1 = switch will not filter 802.1x “flow control” packets.
Reserved
Link Change Age
1 = link change from “link” to “no link” will cause fast aging (<800us) to age address
table faster. After an age cycle is complete, the age logic will return to normal (300 +
75 seconds).
Note: If any port is unplugged, all addresses will be automatically aged out.
Description
802.1Q VLAN Enable
1 = 802.1Q VLAN mode is turned on. VLAN table must be set up before the operation.
0 = 802.1Q VLAN is disabled.
IGMP Snoop Enable On Switch Host port
1 = IGMP snoop is enabled.
All the IGMP packets are forwarded to the Switch 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 Queueing enabled. When all four queues have packets waiting to
transmit, the bandwidth allocation is q3:q2:q1:a0 = 8:4:2:1.
If any queues are empty, the highest non-empty queue gets one more weighting. For
example, if q2 is empty, q3:q1:q0 becomes (8+1): 0:2:1.
Reserved
Sniff Mode Select
1 =performs RX and TX sniff (both the source port and destination port need to
match).
0 = performs RX or TX sniff (either the source port or destination port needs to match).
This is the mode used to implement RX only sniff.
74
KSZ8842-16/32 MQL/MVL/MVLI/MBL
M9999-102207-1.9