HYB25DC128800C Datasheet, PDF (15/32 Pages) Qimonda AG – 128-Mbit Double-Data-Rate SDRAM

Internet Data Sheet
HYB25DC128[800/160]C[E/F]
128-Mbit Double-Data-Rate SDRAM
Current State CKE n-1
CKEn
Command n
TABLE 11
Truth Table 2: Clock Enable (CKE)
Action n
Note
Previous Cycle Current Cycle
Self Refresh L
Self Refresh L
L
X
Maintain Self-Refresh
1)
H
Deselect or NOP
Exit Self-Refresh
2)
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 Table 12
—
—
1) V_REF must be maintained during Self Refresh operation
2) Deselect or NOP commands should be issued on any clock edges occurring during the Self Refresh Exit (t_XSNR) period. A minimum of 200
clock cycles are needed before applying a read command to allow the DLL to lock to the input clock.
Notes
1. CKEn 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 CS
Any
H
L
Idle
L
L
L
Row Active L
L
L
Read (Auto L
Precharge
L
Disabled)
L
Write (Auto L
Precharge
L
Disabled)
L
TABLE 12
Truth Table 3: Current State Bank n - Command to Bank n (same bank)
RAS CAS WE Command
Action
Note
X X X Deselect
NOP. Continue previous operation.
1)2)3)4)5)6)
H H H No Operation
NOP. Continue previous operation.
1) to 6)
L H H Active
Select and activate row
1) to 6)
L L H AUTO REFRESH —
1) to7)
L L L MODE REGISTER —
1) to 7)
SET
H L H Read
Select column and start Read burst
1) to 6),8)
H L L Write
Select column and start Write burst
1) to 6),8)
L H L Precharge
Deactivate row in bank(s)
1) to 6),9)
H L H Read
Select column and start new Read burst ^{1) to 6),8)}
L H L Precharge
Truncate Read burst, start Precharge ^{1) to 6),9)}
H H L BURST
TERMINATE
BURST TERMINATE
1) to 6),10)
H L H Read
Select column and start Read burst
1) to 6),8),11)
H L L Write
Select column and start Write burst
1) to 6),8)
L H L Precharge
Truncate Write burst, start Precharge
1) to 6),9),11)
Rev. 1.1, 2007-01
15
03062006-JXUK-E7R1