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KS8993M Datasheet(PDF) 34 Page - Micrel Semiconductor |
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KS8993M Datasheet(HTML) 34 Page - Micrel Semiconductor |
34 / 85 page 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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