參數(shù)資料
型號: IBM3209K3114
廠商: IBM Microeletronics
英文描述: IBM Packet Routing Switch Serial Interface Converter(IBM封裝路線選擇開關(guān)串行接口轉(zhuǎn)換器)
中文描述: IBM的分組路由交換機(jī)串行接口轉(zhuǎn)換器(IBM的封裝路線選擇開關(guān)串行接口轉(zhuǎn)換器)
文件頁數(shù): 30/152頁
文件大小: 2390K
代理商: IBM3209K3114
IBM3209K3114
IBM Packet Routing Switch Serial Interface Converter
Advance
Functional Description
Page 20 of 142
prssi.01
July 12, 2000
3.3.4 Egress Packet Formatter
The Egress Packet Formatter is the interface between the egress FIFO and the PE interface logic which
translates the switch LU format into the egress packet format that matches the format expected by the PE.
The Egress Packet Formatter:
Changes the position of the proper data bytes in the packet which have been moved in the ingress path
Inserts the switch Output Queue Grant & Shared Memory Flow control information at the byte position
occupied by the bit map and some of the packet qualifier bits
Inserts idle packets when there is no data packet to be sent
Figure 13: Example of Converter Egress Idle Packet
Byte
Byte 0
Byte 1
Byte 2
Byte 3
M
L
Bit
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9
Packet Qualifier
1
1
0
0
Output Queue Grant [31:24]
Output Queue Grant [23:16]
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
8
0
7
1
6
1
5
0
4
0
3
1
2
1
1
0
0
0
Word 0
Word 1
1
1
0
0
1
1
0
0
1
1
0
Output Queue Grant [15:8]
1
1
0
0
1
1
0
0
Output Queue Grant [7:0]
1
0
0
1
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
1
1
0
0
0
0
Word 15
Table 7: Packet Qualifier for Egress Idle Packet
Idle Packet
Bit 31
Bit 30
Bit 29
Bit 28
Bit 27
Bit 26
Bit 25
Bit 24
Bit Meaning
Shared Memory Grant
Priority Level
Shared
Memory
Status
Hold =
0
Grant =
1
Output Queue Grant
Priority Indicator
0
0
0
Memory Grant Priority
Level Definition
Highest
0
0
Medium High
0
1
Medium Low
1
0
Lowest
1
1
Output Queue Grant
Priority Indicator
Highest
0
0
Medium High
0
1
Medium Low
1
0
Lowest
1
1
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