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上传时间: 2011-04-14
详细说明： Contents ii 4.9.1 Self-Refresh Temperature Range - SRT ...................................................................46 4.10 Multi Purpose Register...................................................................................................48 4.10.1 MPR Functional Description ..................................................................................49 4.10.2 MPR Register Address Definition ..........................................................................50 4.10.3 Relevant Timing Parameters............ .......................................................................50 4.10.4 Protocol Example....................................................................................................50 4.11 ACTIVE Command .......................................................................................................55 4.12 PRECHARGE Command ..............................................................................................55 4.13 READ Operation............................................................................................................56 4.13.1 READ Burst Operation ...........................................................................................56 4.13.2 READ Timing Definitions 57 4.13.3 Burst Read Operation followed by a Precharge......................................................66 4.14 WRITE Operation ..........................................................................................................68 4.14.1 DDR3 Burst Operation............................................................................................68 4.14.2 WRITE Timing Violations......................................................................................68 4.14.3 Write Data Mask .....................................................................................................69 4.14.4 tWPRE Calculation .................................................................................................70 4.14.5 tWPST Calculation .................................................................................................70 4.15 Refresh Command..........................................................................................................77 4.16 Self-Refresh Operation...................................................................................................79 4.17 Power-Down Modes.......................................................................................................81 4.17.1 Power-Down Entry and Exit ...................................................................................81 4.17.2 Power-Down clarifications - Case 1 .......................................................................86 4.17.3 Power-Down clarifications - Case 2 .......................................................................87 4.17.4 Power-Down clarifications - Case 3 .......................................................................88 4.18 ZQ Calibration Commands ............................................................................................89 4.18.1 ZQ Calibration Description.....................................................................................89 4.18.2 ZQ Calibration Timing............................................................................................90 4.18.3 ZQ External Resistor Value, Tolerance, and Capacitive loading ...........................90 5 On-Die Termination (ODT).....................................................................................................91 5.1 ODT Mode Register and ODT Truth Table.....................................................................91 5.2 Synchronous ODT Mode .................................................................................................92 5.2.1 ODT Latency and Posted ODT.................................................................................92 5.2.2 Timing Parameters ....................................................................................................92 5.2.3 ODT during Reads ....................................................................................................94 5.3 Dynamic ODT..................................................................................................................96 5.3.1 Functional Description:.............................................................................................96 5.3.2 ODT Timing Diagrams .............................................................................................97 5.4 Asynchronous ODT Mode .............................................................................................102 5.4.1 Synchronous to Asynchronous ODT Mode Transitions.........................................103 5.4.2 Synchronous to Asynchronous ODT Mode Transition during Power-Down Entry103 5.4.3 Asynchronous to Synchronous ODT Mode Transition during Power-Down Exit .106 5.4.4 Asynchronous to Synchronous ODT Mode during short CKE high and short CKE low periods.....................................................................................................................107 ...展开收缩
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