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KS8995MI Datasheet

  • KS8995MI

  • Micrel Semiconductor [Integrated 5-Port 10/100 Managed Swit...

  • 268.27KB

  • MICREL

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KS8995M
Tx Port
鈥淭ag Insertion鈥?/div>
0
Tx Port
鈥淭ag Removal鈥?/div>
0
Micrel
Ingress Tag Field
(0x810+ port mask)
Egress Action to Tag Field
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Modify tag field to 0x8100
Recalculate CRC
No change to TCI if not null VID
Replace VID with ingress (port 5) port VID if null VID
(0x810+ port mask)
0
1
鈥?(STPID + TCI) will be removed
鈥?Padding to 64 bytes if necessary
鈥?Recalculate CRC
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Modify tag field to 0x8100
Recalculate CRC
No change to TCI if not null VID
Replace VID with ingress (port 5) port VID if null VID
Modify tag field to 0x8100
Recalculate CRC
No change to TCI if not null VID
Replace VID with ingress (port 5) port VID if null VID
(0x810+ port mask)
1
0
(0x810+ port mask)
1
1
Not Tagged
Don鈥檛 care
Don鈥檛 care
Determined by the dynamic MAC address table
Table 5. STPID Egress Rules (Processor to Switch Port 5)
For packets from regular ports (port 1 - port 4) to port 5, the port mask is used to tell the processor which port the packet was
received on, defined as:
鈥?001鈥?from port 1,
鈥?010鈥?from port 2,
鈥?100鈥?from port 3,
鈥?000鈥?from port 4
No values other than the previous four defined should be received in this direction in the special mode. Table 6 shows the
egress rule for this direction.
Ingress Packets
Tagged with 0x8100 + TCI
Egress Action to Tag Field
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Modify TPID to 0x810 + 鈥減ort mask,鈥?which indicates source port
No change to TCI, if VID is not null
Replace null VID with ingress port VID
Recalculate CRC
Not tagged
鈥?Insert TPID to 0x810 + 鈥減ort mask,鈥?which indicates source port
鈥?Insert TCI with ingress port VID
鈥?Recalculate CRC
Table 6. STPID Egress Rules (Switch to Processor)
IGMP Support
There are two parts involved to support IGMP in layer 2. The first part is 鈥淚GMP鈥?snooping. The switch will trap IGMP packets
and forward them only to the processor port. The IGMP packets are identified as IP packets (either Ethernet IP packets or IEEE
802.3 SNAP IP packets) AND IP version = 0x4 AND protocol number = 0x2. The second part is 鈥渕ulticast address insertion鈥?/div>
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 this feature, set register 5 bit 6 to 1. Also 鈥渟pecial tag
mode鈥?needs to be enabled, so that the processor knows which port the IGMP packet was received on. Enable 鈥渟pecial tag
mode鈥?by setting both register 11 bit 0 and register 80-bit 2.
M9999-120403
30
December 2003

KS8995MI 产品属性

  • 66

  • 集成电路 (IC)

  • 专用 IC

  • *

  • *

  • *

  • 表面贴装

  • 128-BFQFP

  • 128-PQFP（14x20）

  • 散装

  • 576-1020

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