KSZ8842-PMBL AM TR Micrel Inc, KSZ8842-PMBL AM TR Datasheet - Page 30

• Manufacturer Part Number: KSZ8842-PMBL AM TR
• Description: 2-Port Ethernet Switch/Repeater + 32-bit/33MHz PCI Bus Interface( )
• Manufacturer: Micrel Inc

Specifications of KSZ8842-PMBL AM TR

• 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
• Data Rate (typ): 10/100Mbps
• Vlan Support: Yes
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Mounting: Surface Mount
• Jtag Support: No
• Operating Supply Voltage (max): 3.5V
• Operating Supply Voltage (min): 3.1V
• Operating Temperature Classification: Industrial
• Data Rate: 100Mbps
• Lead Free Status / RoHS Status: Supplier Unconfirmed

Micrel, Inc.
IGMP Support
For Internet Group Management Protocol (IGMP) support in Layer 2, the KSZ8842-PMQL/PMBL provides two
components:
“IGMP” Snooping
packets are identified as IP packets (either Ethernet IP packets, or IEEE 802.3 SNAP IP packets) with IP version = 0x4
and protocol version number = 0x2.
“Multicast Address Insertion” in the Static MAC Table
Once the multicast address is programmed in the Static MAC Table, the multicast session is trimmed to the subscribed
ports, instead of broadcasting to all ports.
IPv6 MLD Snooping
processor (host port). MLD snooping is controlled by SGCR2[13] (MLD snooping enable) and SGCR2[12] (MLD option).
Setting SGCR2[13] causes the KSZ8842-PMQL/PMBL to trap packets that meet all of the following conditions:
Port Mirroring Support
KSZ8842-PMQL/PMBL supports “Port Mirroring” comprehensively as:
“receive only” mirror on a port
All the packets received on the port are mirrored on the sniffer port. For example, port 1 is programmed to be “receive
sniff” and the host port is programmed to be the “sniffer port”. A packet received on port 1 is destined to port 2 after the
internal lookup. The KSZ8842-PMQL/PMBL forwards the packet to both port 2 and the host port. The KSZ8842-
PMQL/PMBL can optionally even forward “bad” received packets to the “sniffer port”.
“transmit only” mirror on a port
All the packets transmitted on the port are mirrored on the sniffer port. For example, port 1 is programmed to be
“transmit sniff” and the host port is programmed to be the “sniffer port”. A packet received on port 2 is destined to port 1
October 2007
The KSZ8842-PMQL/PMBL traps IGMP packets and forwards them only to the processor (host port). The IGMP
The KSZ8842-PMQL/PMBL traps IPv6 Multicast Listener Discovery (MLD) packets and forwards them only to the
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•
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forwarded.
Learning is
disabled.
Learning State
Only packets to
and from the
processor are
forwarded.
Learning is
enabled.
Forwarding
State
Packets are
forwarded and
received normally.
Learning is
enabled.
IPv6 multicast packets
Hop count limit = 1
IPv6 next header = 1 or 58 (or = 0 with hop-by-hop next header = 1 or 58)
If SGCR2[12] =1, IPv6 next header = 43, 44, 50, 51, or 60 (or =0 with hop-by-hop next header = 43, 44, 50, 51,
or 60)
Port Setting
“transmit enable = 0,
receive enable = 0,
learning disable = 0”
Port Setting
“transmit enable = 1,
receive enable = 1,
learning disable = 0”
Table 4. KSZ8841-PMQL/PMBL EEPROM Format
specific packets to the processor. The processor may send
packets to the port(s) in this state. Address learning is disabled on
the port in this state.
The processor should program the “Static MAC table” with the
entries that it needs to receive (for example, BPDU packets). The
“overriding” bit should be set so that the switch will forward those
specific packets to the processor. The processor may send
packets to the port(s) in this state. Address learning is enabled on
the port in this state.
Software Action
The processor programs the “Static MAC table” with the entries
that it needs to receive (for example, BPDU packets). The
“overriding” bit is set so that the switch forwards those specific
packets to the processor. The processor can send packets to the
port(s) in this state. Address learning is enabled on the port in this
state.
Software Action
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KSZ8842-PMQL/PMBL
M9999-100207-1.5