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PM7385 参数 Datasheet PDF下载

PM7385图片预览
型号: PM7385
PDF下载: 下载PDF文件 查看货源
内容描述: 84 LINK , 672通道帧引擎和数据链路管理与ANY -PHY分组接口 [84 LINK, 672 CHANNEL FRAME ENGINE AND DATA LINK MANAGER WITH ANY-PHY PACKET INTERFACE]
分类和应用:
文件页数/大小: 244 页 / 2231 K
品牌: PMC [ PMC-SIERRA, INC ]
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PM7385 FREEDM-84A672  
DATA SHEET  
PMC-1990114  
ISSUE 6  
84 LINK, 672 CHANNEL FRAME ENGINE AND DATA LINK MANAGER  
WITH ANY-PHY PACKET INTERFACE  
Figure 2 – CRC Generator  
g
g
g
n-1  
1
2
Message  
D
D
D
D
n-1  
0
1
2
LSB  
Parity Check Digits  
MSB  
8.3 SBI Extracter and PISO  
The SBI receive circuitry consists of an SBI Extract block and three SBI Parallel  
to Serial Converter (SBI PISO) blocks. The SBI Extract block receives data from  
the SBI DROP BUS and converts it to an internal parallel bus format. The  
received data is then converted to serial bit streams by the PISO blocks. Each  
PISO block processes one of the three Synchronous Payload Envelopes (SPEs)  
conveyed on the SBI DROP BUS.  
The SBI Extract block may be configured to enable or disable reception of  
individual tributaries within the SBI DROP bus. Individual tributaries may also be  
configured to operate in framed or unframed mode.  
Each PISO block processes data from one SPE on the internal parallel bus and  
generates either 28 serial data streams at T1/J1 rate, 21 streams at E1 rate or a  
single stream at DS-3 rate. These serial streams are then processed by the  
Receive Channel Assigner block.  
8.4 Receive Channel Assigner  
The Receive Channel Assigner block (RCAS672) processes up to 84 serial links.  
When receiving data from the SBI PISO blocks, links may be configured to  
support channelised T1/J1/E1 traffic, unchannelised DS-3 traffic or unframed  
traffic at T1/J1, E1 or DS-3 rates. When receiving data from the RCLK/RD  
inputs, links 0, 1 and 2 support unchannelised data at arbitary rates up to 51.84  
Mbps.  
Each link is independent and has its own associated clock. For each link, the  
RCAS672 performs a serial to parallel conversion to form data bytes. The data  
bytes are multiplexed, in byte serial format, for delivery to the Receive HDLC  
Processor / Partial Packet Buffer block (RHDL672) at SYSCLK rate. In the event  
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE  
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