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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  
Warning: Attempting a page copy while a page swap is pending can lead to corruption of  
both online and offline memory pages if the page swap occurred while the page copy is in  
progress.  
12.7 Telecombus Mode Operation  
In Telecombus mode operation, only 1080 words of the configuration RAM are utilized. This  
same configuration is repeated nine times for switching the entire 9720 byte OC-12 frame. In this  
mode, RC1FP is flywheeled internally every frame so that page swaps can also occur at this  
frequency. The OC1FP output pulse that is used to resynchronize external TSBs occurs at every  
4th frame.  
To configure this mode of operation, use the following programming steps. Note, the order in  
which these steps are followed is irrelevant.  
1. Program the DCB Frame Size register (0x4A) to 1079.  
°
This programs the DCB to use just 1080 location of the RAMs.  
2. Program the DCB MF_SWAP bits in Configuration register (0x4C) to 00.  
°
This will program the DCB to effect page changes at every 9720 byte frame when a page  
swap request is received.  
°
°
°
OC1FP will be output at every 4th frame.  
CMP inputs will be sampled every frame at the internally flywheeled RC1FP location.  
If enabled, FRAMEI will occur every frame at the internally flywheeled RC1FP location.  
12.8 SBI Column Mode Operation  
In SBI column mode operation, only 1080 rows of the configuration RAM is utilized, this same  
configuration is repeated nine times for switching the entire 9720 byte OC12 frame and 36 times  
to form the 4-frame multiframe. In this mode, RC1FP is flywheeled internally every fourth frame  
so that page swap can also occur at this frequency. OC1FP output that is used to resynchronize  
external TSBs also occurs at every fourth frame.  
To configure this mode of operation, use the following programming steps. Note, the order in  
which these steps are followed is irrelevant.  
1. Program the DCB Frame Size register (0x04A) to 1079.  
°
This programs the DCB to use just 1080 location of the RAMs.  
2. Program the MF_SWAP bits in DCB Configuration register (0x04C) to 01.  
°
This will program the DCB to effect page changes at every 4 x 9720 frame when a page  
swap request is received.  
°
°
OC1FP will be output at every 4 frame.  
CMP inputs will be sampled every 4 frame at the internally flywheeled RC1FP location.  
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use  
Document ID: PMC-2010850, Issue 1  
147