參數(shù)資料
型號： HYB25D256160CC-5
廠商： INFINEON TECHNOLOGIES AG
英文描述： 256 Mbit Double Data Rate SDRAM
中文描述： 256兆雙倍數(shù)據(jù)速率SDRAM
文件頁數(shù)： 55/94頁
文件大?。?/td> 3326K
代理商： HYB25D256160CC-5
Data Sheet
59
Rev. 1.6, 2004-12
HYB25D256[16/40/80]0C[E/C/F/T](L)
256 Mbit Double-Data-Rate SDRAM
Functional Description
Table 12
Truth Table 4: Current State Bank n - Command to Bank m (different bank)
Current State
CS
RAS CAS WE
Command
Action
Notes
Any
H
X
Deselect
NOP. Continue previous operation. 1)2)3)4)5)6)
L
H
No Operation
NOP. Continue previous operation. 1) to 6)
Idle
XX
Any Command
Otherwise Allowed
to Bank m
–
Row Activating,
Active, or
Precharging
L
H
Active
Select and activate row
L
H
L
H
Read
Select column and start Read burst 1) to 7)
L
H
L
Write
Select column and start Write burst 1) to 7)
L
H
L
Precharge
–
Read (Auto
Precharge
Disabled)
L
H
Active
Select and activate row
L
H
L
H
Read
Select column and start new Read
burst
L
H
L
Precharge
–
Write (Auto
Precharge
Disabled)
L
H
Active
Select and activate row
L
H
L
H
Read
Select column and start Read burst 1) to 8)
L
H
L
Write
Select column and start new Write
burst
L
H
L
Precharge
–
Read (With Auto
Precharge)
L
H
Active
Select and activate row
L
H
L
H
Read
Select column and start new Read
burst
1) to 7), 9)
L
H
L
Write
Select column and start Write burst 1) to 7), 9), 10)
L
H
L
Precharge
–
Write (With Auto
Precharge)
L
H
Active
Select and activate row
L
H
L
H
Read
Select column and start Read burst 1) to 7), 9)
L
H
L
Write
Select column and start new Write
burst
L
H
L
Precharge
–
1) This table applies when CKE n-1 was HIGH and CKE n is HIGH (see Table 10: Clock Enable (CKE) and after
t
XSNR/tXSRD
has been met (if the previous state was self refresh).
2) This table describes alternate bank operation, except where noted, i.e., the current state is for bank n and the commands
shown are those allowed to be issued to bank m (assuming that bank m is in such a state that the given command is
allowable). Exceptions are covered in the notes below.
3) Current state definitions:
Idle: The bank has been precharged, and
t
RP has been met.
Row Active: A row in the bank has been activated, and
t
RCD has been met. No data bursts/accesses and no register
accesses are in progress.
Read: A Read burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been terminated.
Write: A Write burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been terminated.
Read with Auto Precharge Enabled: See 10).
Write with Auto Precharge Enabled: See 10).
4) AUTO REFRESH and Mode Register Set commands may only be issued when all banks are idle.
5) A BURST TERMINATE command cannot be issued to another bank; it applies to the bank represented by the current state
only.
6) All states and sequences not shown are illegal or reserved.
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