KS8993F-A1 Micrel Inc, KS8993F-A1 Datasheet - Page 38

• Manufacturer Part Number: KS8993F-A1
• Description: IC CONV MED 10/100 3PORT 128PQFP
• Manufacturer: Micrel Inc

Specifications of KS8993F-A1

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 128-MQFP, 128-PQFP
• For Use With: KS8993F-EVAL - EVAL KIT EXPERIMENTAL KS8993F
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

KS8993F
Micrel
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 look up. The KS8993F will forward the packet to both port 2
and port 3. The KS8993F 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 look up. The KS8993F 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 look up. The KS8993F will forward the
packet to both port 2 and 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.
2.9.2 IEEE 802.1Q VLAN support
The KS8993F supports 16 active VLANs out of the 4096 possible VLANs specified in the IEEE 802.1Q specification.
KS8993F provides a 16-entries VLAN Table, which converts the 12-bits VLAN ID (VID) to the 4-bits Filter ID (FID) for
address look up. If a non-tagged or null-VID-tagged packet is received, the ingress port default VID is used for look
up. In VLAN mode, the look up process starts with VLAN Table look up 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 look up. The FID + Destination Address (FID+DA) are used to determine the destination port. The FID +
Source Address (FID+SA) are used for address learning.
August 26, 2004
Revision 1.0
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