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PPC440EP Datasheet(PDF) 79 Page - Applied Micro Circuits Corporation |
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PPC440EP Datasheet(HTML) 79 Page - Applied Micro Circuits Corporation |
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79 / 84 page  AMCC Proprietary 79 440EP – PPC440EP Embedded Processor Data Sheet Revision 1.26 – April 25, 2007 Example 3: In this example, ECC is enabled. This requires that Stage 3 data be sampled at (3). If ECC is disabled, the system will still work, but there will be more latency before the data is sampled into RDSP. In this example, TT and TTE are system dependent and taken into account by controller initialization software. Figure 13. DDR SDRAM Read Cycle Timing—Example 3 DQS at pin PLB Clock Read Clock Delayed TSIN Data at pin D0 D1 D2 D3 DQS Stage 1 C D0 D1 D2 D3 TDIN D0 D2 Data in Stage 1 D D1 D3 Data out Stage 1 High Low TP D0 D2 D1 D3 Data out Stage 3 High Low with ECC TT = Propagation delay from Stage 2 input to RDSP input w/o ECC D0 D2 D1 D3 Data out Stage 2 High Low Data out RDSP High Low (3) with ECC TP D0 D2 D1 D3 Data in at RDSP High Low with ECC D0 D2 D1 D3 TTE = Propagation delay from Stage 2 input to RDSP input with ECC TTE D0 D2 |
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