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| 型號： | IBMN612804GT3B |
| 廠商： | IBM Microeletronics |
| 英文描述： | 128Mb Double Data Rate Synchronous DRAM(128M位高速CMOS同步動態(tài)RAM（采用雙數(shù)據(jù)速率結(jié)構(gòu)）) |
| 中文描述： | 128Mb的雙數(shù)據(jù)速率同步DRAM（128兆位高速的CMOS同步動態(tài)隨機存儲器（采用雙數(shù)據(jù)速率結(jié)構(gòu)）） |
| 文件頁數(shù)： | 15/79頁 |
| 文件大?。?/td> | 1324K |
| 代理商： | IBMN612804GT3B |
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IBMN612404GT3B
IBMN612804GT3B
Preliminary
128Mb Double Data Rate Synchronous DRAM
06K0566.F39350B
1/01
IBM Corporation. All rights reserved.
Use is further subject to the provisions at the end of this document.
Page 15 of 79
Commands
Truth Tables 1a and 1b provide a reference of the commands supported by DDR SDRAM devices. A verbal
description of each commands follows.
Truth Table 1a: Commands
Name (Function)
CS
RAS
CAS
WE
Address
MNE
Notes
Deselect (Nop)
H
X
X
X
X
NOP
1, 9
No Operation (Nop)
L
H
H
H
X
NOP
1, 9
Active (Select Bank And Activate Row)
L
L
H
H
Bank/Row
ACT
1, 3
Read (Select Bank And Column, And Start Read Burst)
L
H
L
H
Bank/Col
Read
1, 4
Write (Select Bank And Column, And Start Write Burst)
L
H
L
L
Bank/Col
Write
1, 4
Burst Terminate
L
H
H
L
X
BST
1, 8
Precharge (Deactivate Row In Bank Or Banks)
L
L
H
L
Code
PRE
1, 5
Auto Refresh Or Self Refresh (Enter Self Refresh Mode)
L
L
L
H
X
AR / SR
1, 6, 7
Mode Register Set
L
L
L
L
Op-Code
MRS
1, 2
1. CKE is high for all commands shown except Self Refresh.
2. BA0, BA1 select either the Base or the Extended Mode Register (BA0 = 0, BA1 = 0 selects Mode Register; BA0 = 1, BA1 = 0
selects Extended Mode Register; other combinations of BA0-BA1 are reserved; A0-A11 provide the op-code to be written to the
selected Mode Register.)
3. BA0-BA1 provide bank address and A0-A11 provide row address.
4. BA0, BA1 provide bank address; A0-Aiprovide column address (where i= 9 for x8 and 9, 11 for x4); A10 high enables the Auto
Precharge feature (nonpersistent), A10 low disables the Auto Precharge feature.
5. A10 LOW: BA0, BA1 determine which bank is precharged.
A10 HIGH: all banks are precharged and BA0, BA1 are “Don’t Care.”
6. This command is auto refresh if CKE is high; Self Refresh if CKE is low.
7. Internal refresh counter controls row and bank addressing; all inputs and I/Os are “Don’t Care” except for CKE.
8. Applies only to read bursts with Auto Precharge disabled; this command is undefined (and should not be used) for read bursts with
Auto Precharge enabled or for write bursts
9. Deselect and NOP are functionally interchangeable.
Truth Table 1b: DM Operation
Name (Function)
DM
DQs
Notes
Write Enable
L
Valid
1
Write Inhibit
H
X
1
1. Used to mask write data; provided coincident with the corresponding data.
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