參數(shù)資料
型號: KSZ8895MQ-EVAL
廠商: Micrel Inc
文件頁數(shù): 60/119頁
文件大?。?/td> 0K
描述: BOARD EVALUATION FOR KSZ8895MQ
標準包裝: 1
主要目的: 接口,以太網(wǎng)控制器(PHY 和 MAC)
嵌入式:
已用 IC / 零件: KSZ8895MQ
已供物品:
相關產(chǎn)品: 576-3753-ND - IC ETHERNET SW 5PORT 128-PQFP
其它名稱: 576-3871
Micrel, Inc.
KSZ8895MQ/RQ/FMQ
Tail Tagging Mode
The Tail Tag is only seen and used by the Port 5 interface, which should be connected to a processor by SW5-
MII/RMII interface. The one byte tail tagging is used to indicate the source/destination port in Port 5. Only bit [3
0]
are used for the destination in the tail tagging byte. Other bits are not used. The Tail Tag feature is enabled by setting
register 12 bit 1.
Figure 12. Tail Tag Frame Format
Ingress to Port 5 (Host --> KSZ8895MQ/RQ/FMQ)
Bit [3:0]
Destination
0,0,0,0
Reserved
0,0,0,1
Port 1 (direct forward to Port1)
0,0,1,0
Port 2 (direct forward to Port2)
0,1,0,0
Port 3 (direct forward to Port3)
1,0,0,0
Port 4 (direct forward to Port4)
1,1,1,1
Port 1, 2,3 and 4 (direct forward to Port 1,2,3,4,)
Bit[7:4]
0,0,0,0
Queue 0 is used at destination port
0,0,0,1
Queue 1 is used at destination port
0,0,1,0
Queue 2 is used at destination port
0,0,1,1
Queue 3 is used at destination port
x, 1,x,x
Anyhow send packets to specified port in bits [3:0]
1, x,x,x
Bit[6:0] will be ignored as normal (Adress look-up)
Egress from Port 5 (KSZ8895MQ/RQ/FMQ --> Host)
Bit [1:0]
Source
0,0
Port 1 (packets from Port 1)
0,1
Port 2 (packets from Port 2)
1,0
Port 3 (packets from Port 3)
1,1
Port 4 (packets from Port 4)
Table 7. Tail Tag Rules
March 12, 2014
45
Revision 1.7
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