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DP8521AV-25 Datasheet(PDF) 2 Page - National Semiconductor (TI) |
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DP8521AV-25 Datasheet(HTML) 2 Page - National Semiconductor (TI) |
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2 / 70 page  Table of Contents 10 INTRODUCTION 20 SIGNAL DESCRIPTIONS 21 Address RW and Programming Signals 22 VRAM Control Signals 23 Refresh Signals 24 Port A Access Signals 25 Port B Access Signals (DP8522A) 26 Common Dual Port Signals (DP8522A) 27 Power Signals and Capacitor Input 28 Clock Inputs 30 PORT A ACCESS MODES 31 Access Mode 0 32 Access Mode 1 40 REFRESH OPTIONS 41 Refresh Control Modes 411 Automatic Internal Refresh 412 Externally ControlledBurst Refresh 413 Refresh RequestAcknowledge 42 Refresh Cycle Types 421 Conventional Refresh 422 Staggered Refresh 423 Error Scrubbing Refresh 43 Extending Refresh 44 Clearing the Refresh Address Counter 45 Clearing the Refresh Request Clock 50 PORT A WAIT STATE SUPPORT 51 WAIT Type Output 52 DTACK Type Output 53 Wait State Support for VRAM Transfer Cycles 54 Dynamically Increasing the Number of Wait States 55 Guaranteeing RAS Low Time and RAS Precharge Time 60 DP8520A21A22A VIDEO RAM SUPPORT 61 Support for VRAM Transfer Cycles 62 Support for VRAM Access Cycles through Port A 70 ADDITIONAL ACCESS SUPPORT FEATURES 71 Address Latches and Column Increment 72 Address Pipelining 73 Delay CAS During Write Accesses 80 RAS AND CAS CONFIGURATION MODES 81 Byte Writing 82 Memory Interleaving 83 Address Pipelining 84 Error Scrubbing 85 PageBurst Mode 90 PROGRAMMING AND RESETTING 91 Mode Load Only Programming 92 Chip Selected Access Programming 93 External Reset 94 Definition of Programming Bits 100 TEST MODE 110 VRAM CRITICAL TIMING OPTIONS 111 Programming Values of tRAH and tASC 112 Calculation of tRAH and tASC 120 DUAL ACCESSING (DP8522A) 121 Port B Access Mode 122 Port B Wait State Support 123 Common Port A and Port B Dual Port Functions 1231 GRANTB Output 1232 LOCK Input 130 ABSOLUTE MAXIMUM RATINGS 140 DC ELECTRICAL CHARACTERISTICS 150 AC TIMING PARAMETERS 160 FUNCTIONAL DIFFERENCES BETWEEN THE DP8520A21A22A AND THE DP85202122 170 DP8520A21A22A USER HINTS 180 DESCRIPTION OF A DP8522ADP8500 SYSTEM INTERFACE 2 |
Similar Part No. - DP8521AV-25 |
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Similar Description - DP8521AV-25 |
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