KSZ8842-16MQL Micrel Inc, KSZ8842-16MQL Datasheet - Page 67

• Manufacturer Part Number: KSZ8842-16MQL
• Description: IC SWITCH 10/100 16BIT 128PQFP
• Manufacturer: Micrel Inc

Specifications of KSZ8842-16MQL

• Data Rate: 100Mbps
• Controller Type: Ethernet Switch Controller
• Interface: PCI
• Voltage - Supply: 3.1 V ~ 3.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 128-MQFP, 128-PQFP
• No. Of Ports: 1
• Ethernet Type: IEEE 802.3u
• Supply Current: 122mA
• Supply Voltage Range: 3.1V To 3.5V
• Operating Temperature Range: 0°C To +70°C
• Digital Ic Case Style: QFP
• No. Of: RoHS Compliant
• Number Of Primary Switch Ports: 2
• Internal Memory Buffer Size: 32
• Operating Supply Voltage (typ): 3.3V
• Fiber Support: Yes
• Integrated Led Drivers: Yes
• Phy/transceiver Interface: MII
• Power Supply Type: Analog/Digital
• Package Type: PQFP
• Data Rate (typ): 10/100Mbps
• Vlan Support: Yes
• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Pin Count: 128
• Mounting: Surface Mount
• Jtag Support: No
• Operating Supply Voltage (max): 3.5V
• Operating Supply Voltage (min): 3.1V
• Operating Temperature Classification: Commercial
• Interface Type: PCI
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 576-1634 - BOARD EVALUATION KSZ8842-16MQL
• Current - Supply: -
• Lead Free Status / RoHS Status: Compliant, Lead free / RoHS Compliant
• Other names: 576-1478-5

Bank 32 Switch Global Control Register 2 (0x04): SGCR2
This register contains the global control for the switch function.
Micrel Confidential
Bit
15
14
13
12
11
10-9
8
7
6
5
4
3
November 2005
Default
0
0
0
0
0
0x0
0
1
1
1
1
0
R/W
RW
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 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.
Unicast Port-VLAN Mismatch Discard
1 = no packets can cross the VLAN boundary.
0 = unicast packets (excluding unknown/multicast/broadcast) can cross the VLAN
boundary.
Multicast Storm Protection Disable
1 = “Broadcast Storm Protection” does not include multicast packets. Only DA =
FFFFFFFFFFFF packets are regulated.
0 = “Broadcast Storm Protection” includes DA = FFFFFFFFFFFF and DA[40] = 1
packets.
Back Pressure Mode
1 = carrier sense-based Back Pressure is selected.
0 = collision-based Back Pressure 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 prevents 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 is flow controlled. This may not be “fair” to the
flow control port.
No Excessive Collision Drop
67
KSZ8842-16/32 MQL/MVL
Rev. 1.4