參數(shù)資料
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): 46/79頁
文件大小: 1324K
代理商: IBMN612804GT3B
IBMN612404GT3B
IBMN612804GT3B
128Mb Double Data Rate Synchronous DRAM
Preliminary
IBM Corporation. All rights reserved.
Use is further subject to the provisions at the end of this document.
Page 46 of 79
06K0566.F39350B
1/01
Truth Table 2: Clock Enable (CKE)
1. CKE n is the logic state of CKE at clock edge n: CKE n-1 was the state of CKE at the previous clock edge.
2. Current state is the state of the DDR SDRAM immediately prior to clock edge n.
3. Command n is the command registered at clock edge n, and action n is a result of command n.
4. All states and sequences not shown are illegal or reserved.
Current State
CKE n-1
CKEn
Command n
Action n
Notes
Previous
Cycle
Current
Cycle
Self Refresh
L
L
X
Maintain Self-Refresh
Self Refresh
L
H
Deselect or NOP
Exit Self-Refresh
1
Power Down
L
L
X
Maintain Power-Down
Power Down
L
H
Deselect or NOP
Exit Power-Down
All Banks Idle
H
L
Deselect or NOP
Precharge Power-Down Entry
All Banks Idle
H
L
Auto Refresh
Self Refresh Entry
Bank(s) Active
H
L
Deselect or NOP
Active Power-Down Entry
H
H
See “Truth Table 3: Current State
Bank n - Command to Bank n
(Same Bank)” on page 47
1. Deselect or NOP commands should be issued on any clock edges occurring during the Self Refresh Exit (t
XSNR
) period. A mini-
mum of 200 clock cycles are needed before applying a read command to allow the DLL to lock to the input clock.
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