參數(shù)資料
型號(hào)： UPD46128512-E9X
廠商： NEC Corp.
英文描述： 128M-BIT CMOS MOBILE SPECIFIED RAM 8M-WORD BY 16-BIT EXTENDED TEMPERATURE OPERATION
中文描述： 128兆位CMOS移動(dòng)指明內(nèi)存800萬(wàn)字由16位溫度范圍
文件頁(yè)數(shù)： 7/82頁(yè)
文件大小： 817K
代理商： UPD46128512-E9X
Preliminary Data Sheet M17507EJ2V0DS
7
μ
PD46128512-X
CONTENTS
1. Initialization.................................................................................................................................................. 9
2. Partial Refresh ........................................................................................................................................... 11
2.1 Standby Mode..........................................................................................................................................................11
2.2 Density Switching ....................................................................................................................................................11
2.3 Standby Mode Status Transition..............................................................................................................................11
2.4 Addresses for Which Partial Refresh Is Supported..................................................................................................13
3. Page Read Operation................................................................................................................................ 14
3.1 Features of Page Read Operation...........................................................................................................................14
3.2 Page Length ............................................................................................................................................................14
3.3 Page-Corresponding Addresses..............................................................................................................................14
3.4 Page Start Address..................................................................................................................................................14
3.5 Page Direction.........................................................................................................................................................14
3.6 Interrupt during Page Read Operation.....................................................................................................................14
3.7 When Page Read is not Used..................................................................................................................................14
4. Burst Operation ......................................................................................................................................... 15
4.1 Features of Burst Operation ....................................................................................................................................15
4.2 Burst Length ............................................................................................................................................................15
4.3 Latency....................................................................................................................................................................15
4.4 Single Write .............................................................................................................................................................17
4.5 /WE Control.............................................................................................................................................................17
4.6 Burst Read Suspend/Resume .................................................................................................................................18
4.7 Burst Write Suspend/Resume .................................................................................................................................19
4.8 Burst Read Termination...........................................................................................................................................20
4.9 Burst Write Termination...........................................................................................................................................21
4.10 /WAIT.....................................................................................................................................................................22
4.10.1
Feature of /WAIT Output .............................................................................................................................22
4.10.2
Dummy Wait Cycles at Continuous Burst Operation ...................................................................................25
4.11 Reset Function from Synchronous Burst Mode to Asynchronous Page Mode.......................................................27
5. Mode Register Settings............................................................................................................................. 28
5.1 Mode Register Setting Method ................................................................................................................................28
5.2 Cautions for Setting Mode Register.........................................................................................................................28
5.3 Partial Refresh Density............................................................................................................................................30
5.4 Burst Length ............................................................................................................................................................30
5.5 Function Mode.........................................................................................................................................................30
5.6 Valid Clock Edge .....................................................................................................................................................30
5.7 Read Latency (Write Latency) .................................................................................................................................30
5.8 Single Write .............................................................................................................................................................30
5.9 /WE Control.............................................................................................................................................................31
5.10 Reset to Page Mode..............................................................................................................................................31
5.11 Reserved Bits ........................................................................................................................................................31
5.12 Cautions for Timing Chart of Setting Mode Register..............................................................................................32
6. Electrical Specifications........................................................................................................................... 33
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