参数资料
型号: KSZ8995FQ
厂商: Micrel Inc
文件页数: 32/89页
文件大小: 0K
描述: IC SWITCH 10/100 5PORT 128-PQFP
标准包装: 66
系列: *
产品目录页面: 1081 (CN2011-ZH PDF)
配用: 576-3872-ND - BOARD EVALUATION FOR KSZ8995FQ
其它名称: 576-3077
Micrel, Inc.
KS8995MA/FQ
October 2011
38
M9999-102611-3.0
Ingress Tag Field
Tx Port
“Tag Insertion”
Tx Port
“Tag Removal”
Egress Action to Tag Field
(0x810+ Port Mask)
0
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
(STPID + TCI) will be removed.
Padding to 64 bytes if necessary.
Recalculate CRC.
(0x810+ Port Mask)
1
0
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
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.
Not Tagged
Don’t 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:
“0001” from Port 1,
“0010” from Port 2,
“0100” from Port 3,
“1000” 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
Egress Action to Tag Field
Tagged with 0x8100 + TCI
Modify TPID to 0x810 + “port mask,” which indicate 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 indicate source port.
Insert TCI with ingress port VID.
Recalculate CRC.
Table 6. STPID Egress Rules (Switch to Processor)
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