參數(shù)資料
型號(hào): 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): 106/152頁
文件大小: 2390K
代理商: IBM3209K3114
IBM3209K3114
IBM Packet Routing Switch Serial Interface Converter
Advance
IBM Packet Routing Switch Serial Interface Converter Latency
Page 96 of 142
prssi.01
July 12, 2000
5. IBM Packet Routing Switch Serial Interface Converter Latency
There are two kinds of flow control latencies to be considered: packet latency and flow control latency.
Packet latency is shown below. Packet reshuffling is the main cause because, on ingress, the entire packet
must be received before it can be ascertained if the packet must be discarded due to errors. The re-synchro-
nization layer between the PE clock domain and the switch clock domain is the secondary contributor to
packet latency.
Flow control information latency has two impacts:
The shared memory thresholds within the switch have to be set to low sharing (for example: Priority 3 to
16 Packets, Priority 2 to 32 packets, Priority 1 to 48 packets, and Priority 0 to 64 packets).
The flow control check bit 10 of mode register must be disabled.
Figure 33: Converter Latency Diagram
Ingress PE
Interface
32-bits
125 MHz
Interface
Send Grant_X
Shared Memory Grant-X
TXFULL
RX_Enable
Egress PE
Interface
Output Queue Grant
Ingress DASL
Interface:
Synch/Idle/Yellow
LU Serializer
CRC Insert
Transmit DASL
Interface - X
Packet Reshuffling
Protocol Engine
Interface
Packet Buffering
Interfacing
DASL Macro
DASL Ports
Egress DASL
Interface
Header Extraction
LU Deserializer
CRC Check
X TX FIFO
1cc
1p
3cc
2cc
1cc
1p
1p +1cc
4 to 7cc
1+3cc
1+3cc
cc : clock cycle
p: packet cycle
Force SMG0=0
Receive DASL
Interface - X
IBM 28.4 G
Packet Routing
Switch
Elements
X Plane
MUX
TX Framing
Header Handling
Idle Generation
Egress
Flow Control
O
Protocol
Engine
Ingress
LU Framing
Parity Checking
X RX FIFO
Grant Control
Generation
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