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PM5380-BI 参数 Datasheet PDF下载

PM5380-BI图片预览
型号: PM5380-BI
PDF下载: 下载PDF文件 查看货源
内容描述: [Micro Peripheral IC,]
分类和应用:
文件页数/大小: 440 页 / 2124 K
品牌: PMC [ PMC-SIERRA, INC ]
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S/UNI®-8x155 ASSP Telecom Standard Product Data Sheet  
Released  
10.21.1APS Data Recovery Unit  
The data recovery unit (DRU) recovers the data from the incoming 622Mbit/s APS serial  
stream. The DRU adapts the 622.08 MHz free running clock from the CSU to recover the  
incoming APS bit serial. In order for the DRU to lock to the incoming stream, the APS link  
must be frequency locked to the CSU 622.08 MHz clock. Low frequency jitter, such as  
temperature induced wander, may be tracked by the DRU. For more detailed APS jitter  
performance refer to Table 38.  
10.21.2APS FIFO  
The receive APS FIFO is a 16 byte FIFO which allows a receive APS link to tolerate low  
frequency jitter. Since the DRU tracks low frequency phase variations around the 622.08 MHz  
CSU clock derived from reference clock REFCLK, the APS FIFO synchronizes the APS data  
stream to the local REFCLK domain. Further downstream processing of the APS stream is  
performed on the REFCLK clock domain.  
10.21.3APS Serial to Parallel Converter  
The APS Serial to Parallel Converter (SIPO) searches for the initial SONET/SDH framing  
pattern in the receive APS stream, and performs serial to parallel conversion on octet  
boundaries.  
While out of frame, the SIPO block monitors the recovered APS data stream for an occurrence  
of a A1 byte. The SIPO adjusts its byte alignment of the serial-to-parallel converter when three  
consecutive A1 bytes followed by three consecutive A2 bytes occur in the data stream. The  
SIPO informs the RAOP Framer block when this framing pattern has been detected to  
reinitializes the RAOP to the new frame alignment.  
While in frame, the SIPO maintains the byte alignment APS data stream until AROP declares  
out of frame.  
10.22 Receive APS Overhead Processor  
The Receive APS Overhead Processor (RAOP) provides frame synchronization, descrambling,  
section level alarm and performance monitoring. The processor is similar to a Receive Section  
Overhead processor (RSOP) except some features of the RSOP are not supported.  
10.22.1Framer  
The Framer Block determines the in-frame/out-of-frame status of the receive APS stream.  
While in-frame, the framing bytes (A1, A2) in each frame are compared against the expected  
pattern. Out-of-frame is declared when four consecutive frames containing one or more  
framing pattern errors have been received.  
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.  
Document No.: PMC- 2010299, Issue 2  
95  
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