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PPC440SP-RNC533C 数据表(PDF) 80 Page - Applied Micro Circuits Corporation |
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PPC440SP-RNC533C 数据表(HTML) 80 Page - Applied Micro Circuits Corporation |
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80 / 85 page  PowerPC 440SP Embedded Processor 80 AMCC Proprietary Revision 1.23 - Sept 26, 2006 Data Sheet DDR SDRAM Read Operation The read of the incoming data from the SDRAM is done on the rising and falling edges of the differential DQS signal. The data must be centered on these edges for correct operation. The PPC440SP can delay in very small increments the DQS by means of the programming of the MCIF0_RODC[RQFD] register field. DDR SDRAM MemClkOut0 and Read Clock Delay To accommodate timing variations introduced by the system designs using this chip, the three-stage data path shown in Figure 9, below, is used to eliminate metastability and allow data sampling to be adjusted for minimum latency. The data is stored in the eight Flip Flops of Stage 1, so that it can be transferred later, within an 8X period. Figure 9. DDR SDRAM Read Data Path. PLB bus DQ MCIF0_RQDC[RQFD] Programmed Delay Package Mux Read DQS C D FF: Flip-Flop Q2 DQS (Diff) DDR 1X Clock Mux Data (x64) (x64) Read FIFO PLB 1X Clock Stage 2 Stage 1 Stage 3 FF PLB bus [0:63] [64:127] DQS Rising DQS Falling Q3 0 6 4 2 (x64) Coarse Delay Cycles Driver Rec MemDCFdbkD MemDCFdbkR Ext FeedBack Read Start Feedback Data Capture Window DDR 1X Clock MCIF0_RDCC[RDSS] MCIF0_RFDC[RFFD] MCIF0_RFDC[RFOS] Stage 2 Store Oversampling DQS aligned CAS Lat Delay FeedBack Signal Gen Fine Delay T1 T2 T3 T4 Fine Delay FF FF 7 5 3 1 1 0 7 Edge Sync Edge Sync Upper Lower Signals pins FF Q2_Ovs FF FBK signal Delay +1 Compare DDR 1X Clock Oversampling Clock Read Latency adjust circuit C D FF FF adjust |
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