DP8422V datasheet(2/60 Pages) NSC

2 / 60 page

Table of Contents

10 INTRODUCTION

20 SIGNAL DESCRIPTIONS

21 Address RW and Programming Signals

22 DRAM Control Signals

23 Refresh Signals

24 Port A Access Signals

25 Port B Access Signals (DP8422V DP84T22)

26 Common Dual Port Signals (DP8422V DP84T22)

27 Power Signals and Capacitor Input

28 Clock Inputs

30 PROGRAMMING AND RESETTING

31 External Reset

32 Programming Methods

321 Mode Load Only Programming

322 Chip Selected Access Programming

33 Internal Programming Modes

40 PORT A ACCESS MODES

41 Access Mode 0

42 Access Mode 1

43 Extending CAS with Either Access Mode

44 Read-Modify-Write Cycles with Either Access Mode

45 Additional Access Support Features

451 Address Latches and Column Increment

452 Address Pipelining

453 Delay CAS during Write Accesses

50 REFRESH OPTIONS

51 Refresh Control Modes

511 Automatic Internal Refresh

512 Externally ControlledBurst Refresh

513 Refresh RequestAcknowledge

52 Refresh Cycle Types

521 Conventional Refresh

522 Staggered RefreshTM

523 Error Scrubbing Refresh

53 Extending Refresh

54 Clearing the Refresh Address Counter

55 Clearing the Refresh Request Clock

60 PORT A WAIT STATE SUPPORT

61 WAIT Type Output

62 DTACK Type Output

63 Dynamically Increasing the Number of Wait States

64 Guaranteeing RAS Low Time and RAS Precharge

Time

70 RAS AND CAS CONFIGURATION MODES

71 Byte Writing

72 Memory Interleaving

73 Address Pipelining

74 Error Scrubbing

75 PageBurst Mode

80 TEST MODE

90 DRAM CRITICAL TIMING PARAMETERS

91 Programmable Values of tRAH and tASC

92 Calculation of tRAH and tASC

100 DUAL ACCESSING (DP8422V and DP84T22V)

101 Port B Access Mode

102 Port B Wait State Support

103 Common Port A and Port B Dual Port Functions

1031 GRANTB Output

1032 LOCK Input

104 TRI-STATE Outputs (DP84T22 Only)

110 ABSOLUTE MAXIMUM RATINGS

120 DC ELECTRICAL CHARACTERISTICS

130 AC TIMING PARAMETERS

140 FUNCTIONAL DIFFERENCES BETWEEN THE

DP8420V21V22V DP84T22 AND THE

DP84202122

150 DP8420V21V22V DP84T22 USER HINTS

DP8422V Datasheet(PDF) 2 Page - National Semiconductor (TI)

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