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HYB25D256800CL-6 Datasheet

  • HYB25D256800CL-6

  • 256 Mbit Double Data Rate SDRAM

  • 3260.54KB

  • 94页

  • INFINEON   INFINEON

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HYB25D256[16/40/80]0C[E/C/F/T](L)
256 Mbit Double-Data-Rate SDRAM
Functional Description
Table 10
Truth Table 2: Clock Enable (CKE)
CKEn
Current
Cycle
L
H
L
H
L
L
L
H
X
Deselect or NOP
X
Deselect or NOP
Deselect or NOP
AUTO REFRESH
Deselect or NOP
See
Table 11
Maintain Self-Refresh
Exit Self-Refresh
Maintain Power-Down
Exit Power-Down
Self Refresh Entry
Active Power-Down Entry
鈥?/div>
1)
2)
Current State CKE n-1
Previous
Cycle
Self Refresh
Self Refresh
Power Down
Power Down
All Banks Idle
All Banks Idle
L
L
L
L
H
H
H
1)
Command n
Action n
Notes
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Precharge Power-Down Entry 鈥?/div>
Bank(s) Active H
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.
Note:
1.
2.
3.
4.
CKEn is the logic state of CKE at clock edge n: CKE n-1 was the state of CKE at the previous clock edge.
Current state is the state of the DDR SDRAM immediately prior to clock edge n.
COMMAND n is the command registered at clock edge n, and ACTION n is a result of COMMAND n.
All states and sequences not shown are illegal or reserved.
Truth Table 3: Current State Bank n - Command to Bank n (same bank)
RAS CAS WE
X
H
L
L
L
H
H
L
H
L
H
H
H
L
X
H
H
L
L
L
L
H
L
H
H
L
L
H
X
H
H
H
L
H
L
L
H
L
L
H
L
L
Command
Deselect
No Operation
Active
AUTO REFRESH
MODE
REGISTER SET
Read
Write
Precharge
Read
Precharge
BURST
TERMINATE
Read
Write
Precharge
Action
NOP. Continue previous operation.
NOP. Continue previous operation.
Select and activate row
鈥?/div>
鈥?/div>
Select column and start Read burst
Select column and start Write burst
Deactivate row in bank(s)
Select column and start new Read
burst
Truncate Read burst, start
Precharge
BURST TERMINATE
Select column and start Read burst
Select column and start Write burst
Truncate Write burst, start Precharge
Notes
1)2)3)4)5)6)
1) to 6)
1) to 6)
1) to 7)
1) to 7)
Table 11
Any
Idle
Current State CS
H
L
L
L
L
Row Active
L
L
L
Read (Auto
Precharge
Disabled)
L
L
L
Write (Auto
Precharge
Disabled)
L
L
L
1) to 6), 8)
1) to 6), 8)
1) to 6), 9)
1) to 6), 8)
1) to 6), 9)
1) to 6), 10)
1) to 6), 8), 11)
1) to 6), 8)
1) to 6), 9), 11)
1) This table applies when CKE n-1 was HIGH and CKE n is HIGH (see
Table 10
and after
t
XSNR
/
t
XSRD
has been met (if the
previous state was self refresh).
2) This table is bank-specific, except where noted, i.e., the current state is for a specific bank and the commands shown are
those allowed to be issued to that bank when in that state. Exceptions are covered in the notes below.
Data Sheet
57
Rev. 1.6, 2004-12

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