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KS8993M Datasheet(PDF) 34 Page - Micrel Semiconductor

Part No. KS8993M
Description  Integrated 3-Port 10/100 Managed Integrated 3-Port 10/100 Managed
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Maker  MICREL [Micrel Semiconductor]
Homepage  http://www.micrel.com
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KS8993M Datasheet(HTML) 34 Page - Micrel Semiconductor

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Micrel, Inc.
KS8993M/ML/MI
April 2005
34
M9999-041205
Software action:
The processor should program the “Static MAC table” with the entries that it needs to receive
(e.g., 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,
see “Special Tagging Mode” for details. Address learning is enabled on the port in this state.
Forwarding state:
Packets are forwarded and received normally.
Learning is enabled.
Port setting:
“transmit enable = 1, receive enable = 1, learning disable = 0”
Software action:
The processor should program the “Static MAC table” with the entries that it needs to receive
(e.g., 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,
see “Special Tagging Mode” for details. Address learning is enabled on the port in this state.
Upstream Special Tagging Mode
Upstream Special Tagging Mode is designed for spanning tree protocol IGMP snooping and is flexible for use in
other applications. The Upstream Special Tagging Mode, similar to 802.1Q, requires software to change network
drivers to modify/strip/interpret the special tag. This mode is enabled by setting both register 11 bit 0 and register
48 bit 2 to “1”.
802.1Q Tag Format
Special Tag Format
TPID (tag protocol identifier, 0x8100) + TCI.
STPID (special tag identifier, 0x810 +
4 bit for “port mask”) + TCI
Table 7. Upstream Special Tagging Mode Format
The STPID is only seen and used by the port 3 interface, which should be connected to a processor.
The KS8993M uses a non-zero “port mask” to bypass the lookup result and override any port setting, regardless
of port states (disable, blocking, listening, learning).
For packets from regular ports (port 1 & port 2) to port 3, the port mask is used to tell the processor which port the
packets were received on, defined as follows:
“0001” from port 1
“0010” from port 2
No port mask values, other than the previous two defined ones, should be received in Upstream Special Tagging
Mode. The egress rules are defined as follows:
Ingress Packets
Egress Action to Tag Field
Tagged with 0x8100 + TCI
- Modify TPID to 0x810 + “port mask”, which indicates source port.
- No change to TCI if VID is not null
- Replace null VID with ingress port VID
- Recalculate CRC
Not tagged.
- Insert TPID to 0x810 + “port mask”, which indicates source port
– Insert TCI with ingress port VID
- Recalculate CRC
Table 8. STPID Egress Rules (Switch Port 3 to Processor)


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