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KS8995MI Datasheet(PDF) 42 Page - Micrel Semiconductor |
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KS8995MI Datasheet(HTML) 42 Page - Micrel Semiconductor |
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42 / 73 page  KS8995M Micrel M9999-120403 42 December 2003 Address Name Description Mode Default 1 Legal Maximum Packet 1, will accept packet sizes up to 1536 bytes (inclusive). R/W Pin PMRXER size check disable 0, 1522 bytes for tagged packets (not including packets strap option. with STPID from CPU to ports 1-4), 1518 bytes for Pull-down (0): untagged packets. Any packets larger than the specified 1518/1522 byte value will be dropped. packets. Pull-up (1): 1536 byte packets. Note: PMRXER has internal pull down. 0 Priority Buffer reserve 1, Each output queue is pre-allocated 48 buffers, R/W 0 used exclusively for high priority packets. It is recommended to enable this when priority queue feature is turned on. 0, No reserved buffers for high priority packets. Register 5 (0x05): Global Control 3 7 802.1q VLAN enable 1, 802.1q VLAN mode is turned on. VLAN table needs R/W 0 to set up before the operation. 0, 802.1q VLAN is disabled. 6 IGMP snoop enable on 1, IGMP snoop enabled. All the IGMP packets will be R/W 0 Switch MII interface forwarded to switch MII port. 0, IGMP snoop disabled. 5 Enable direct mode on 1, direct mode on port 5. This is a special mode for the R/W 0 Switch MII interface switch MII interface. Using preamble before MRXDV to direct switch to forward packets, bypassing internal look-up. 0, normal operation. 4 Enable pre tag on 1, packets forwarded to switch MII interface will be R/W 0 Switch MII interface pre-tagged with the source port number. (preamble before MRXDV) 0, normal operation. 3-2 Priority Scheme select 00 = always deliver high priority packets first. R/W 00 01 = deliver high/low packets at ratio 10/1. 10 = deliver high/low packets at ratio 5/1. 11 = deliver high/low packets at ratio 2/1. 1 Enable “tag” mask 1, the last 5 digits in the VID field are used as a mask R/W 0 to determine which port(s) the packet should be forwarded to. 0, no tag masks. 0 Sniff mode select 1, will do Rx AND Tx sniff (both source port and R/W 0 destination port need to match). 0, will do Rx OR Tx sniff (Either source port or destination port needs to match). This is the mode used to implement Rx only sniff. Register 6 (0x06): Global Control 4 7 Switch MII back 1, enable half-duplex back pressure on switch MII R/W 0 pressure enable interface. 0, disable back pressure on switch MII interface. 6 Switch MII half 1, enable MII interface half-duplex mode. R/W Pin SMRXD2 strap duplex mode 0, enable MII interface full-duplex mode. option. Pull-down (0): Full duplex mode. Pull-up (1): Half duplex mode Note: SMRXD2 has internal pull down. |
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