KSZ8993MI Micrel Inc, KSZ8993MI Datasheet - Page 36

• Manufacturer Part Number: KSZ8993MI
• Description: IC SWITCH 10/100 W/TXRX 128PQFP
• Manufacturer: Micrel Inc

Specifications of KSZ8993MI

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 128-MQFP, 128-PQFP
• Number Of Primary Switch Ports: 3
• Internal Memory Buffer Size: 32
• Operating Supply Voltage (typ): 1.8/2.5/3.3V
• Fiber Support: Yes
• Integrated Led Drivers: Yes
• Phy/transceiver Interface: MII/SNI
• Power Supply Type: Analog/Digital
• Package Type: PQFP
• Data Rate (typ): 10/100Mbps
• Vlan Support: Yes
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Pin Count: 128
• Mounting: Surface Mount
• Jtag Support: No
• Operating Supply Voltage (max): 1.89/3.465V
• Operating Supply Voltage (min): 1.71/3.135V
• Power Dissipation: 800mW
• Supply Current: 0.1/0.19A
• Operating Temperature Classification: Industrial
• Data Rate: 100Mbps
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 576-2124; KSZ8993MI

IGMP Support
For IGMP support in layer 2, the KSZ8993M provides two components:
“IGMP” Snooping
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 will be trimmed to the
subscribed ports, instead of broadcasting to all ports.
To enable IGMP support, set register 5 bit 6 to “1”. Also, “Special Tagging Mode” needs to be enabled, so that the
processor knows which port the IGMP packet was received on. This is achieved by setting both register 11 bit 0
and register 48 bit 2 to “1.”
Port Mirroring Support
KSZ8993M supports “Port Mirroring” comprehensively as:
1. “receive only” mirror on a port All the packets received on the port will be mirrored on the sniffer port. For
example, port 1 is programmed to be “receive sniff” and port 3 is programmed to be the “sniffer port”. A packet
received on port 1 is destined to port 2 after the internal lookup. The KSZ8993M will forward the packet to both
port 2 and port 3. The KSZ8993M can optionally forward even “bad” received packets to the “sniffer port”.
2. “transmit only” mirror on a port All the packets transmitted on the port will be mirrored on the sniffer port.
For example, port 1 is programmed to be “transmit sniff” and port 3 is programmed to be the “sniffer port”. A
packet received on port 2 is destined to port 1 after the internal lookup. The KSZ8993M will forward the packet to
both port 1 and port 3.
3. “receive and transmit” mirror on two ports All the packets received on port A and transmitted on port B will
be mirrored on the sniffer port. To turn on the “AND” feature, set register 5 bit 0 to “1”. For example, port 1 is
programmed to be “receive sniff”, port 2 is programmed to be “transmit sniff” and port 3 is programmed to be the
“sniffer port”. A packet received on port 1 is destined to port 2 after the internal lookup. The KSZ8993M will
forward the packet to both port 2 and port 3.
Multiple ports can be selected to be “receive sniff” or “transmit sniff”. And any port can be selected to be the
“sniffer port”. All these per port features can be selected through registers 17, 33 and 49 for ports 1, 2 and 3,
respectively.
IEEE 802.1Q VLAN Support
The KSZ8993M supports 16 active VLANs out of the 4096 possible VLANs specified in the IEEE 802.1Q
specification. KSZ8993M provides a 16-entries VLAN Table, which converts the 12-bits VLAN ID (VID) to the 4-
bits Filter ID (FID) for address lookup. If a non-tagged or null-VID-tagged packet is received, the ingress port
default VID is used for lookup. In VLAN mode, the lookup process starts with VLAN Table lookup to determine
whether the VID is valid. If the VID is not valid, the packet will be dropped and its address will not be learned. If
the VID is valid, the FID is retrieved for further lookup. The FID + Destination Address (FID+DA) are used to
determine the destination port. The FID + Source Address (FID+SA) are used for address learning.
The KSZ8993M will trap IGMP packets and forward them only to the processor (port 3). The IGMP packets are
Micrel, Inc.
October 2008
36
M9999-020606
KSZ8993M/ML