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PM8621 参数 Datasheet PDF下载

PM8621图片预览
型号: PM8621
PDF下载: 下载PDF文件 查看货源
内容描述: NSE- 8G⑩标准产品数据表初步 [NSE-8G⑩ Standard Product Data Sheet Preliminary]
分类和应用:
文件页数/大小: 184 页 / 957 K
品牌: PMC [ PMC-SIERRA, INC ]
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NSE-8G™ Standard Product Data Sheet  
Preliminary  
Figure 23 Switch Timing - DSOs without CAS  
0us  
250us  
500us  
C1FP  
All CMPs  
SBI Frame Time  
Internal Sigs  
SBS IC1FP.INT  
NSE RC1FP.INT  
SBS RC1FP.INT  
SBS OC1FP.INT  
SBS TCMP.INT  
NSE CMP.INT  
SBS OCMP.INT  
12.3.3 SBS/NSE-8G non-DS0 Level Switching with SBI336 Devices  
The SBS and NSE-8G supports another mode of operation that has lower latency and lower  
power when not switching at the DS0 level. In this mode both of these devices become a column  
switch rather than a DS0 switch. This also saves SW configuration since only one row of the  
switch configuration rams has to be configured rather than all nine rows.  
When switching DS0 through the system the SBS must store an entire frame of DS0s before  
routing them to the destination to allow for the last DS0 of a frame to be switched to the first DS0  
of the output. When doing column switching only one row of the SBI structure needs to be stored  
before switching can take place.  
Figure 22 from the previous section can be used here. The following timing diagram shows the  
system timing for this mode of operation.  
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use  
Document ID: PMC-2010850, Issue 1  
141