參數(shù)資料
型號: HYB18T512160AF
廠商: INFINEON TECHNOLOGIES AG
英文描述: 512-Mbit DDR2 SDRAM
中文描述: 512兆位DDR2 SDRAM的
文件頁數(shù): 73/117頁
文件大?。?/td> 2102K
代理商: HYB18T512160AF
Data Sheet
73
Rev. 1.3, 2005-01
09112003-SDM9-IQ3P
HYB18T512[40/80/16]0AF–[3/3S/3.7/5]
512-Mbit DDR2 SDRAM
Functional Description
Figure 60
Auto-Refresh command to Power-Down entry
Figure 61
MRS, EMRS command to Power-Down entry
3.26
Other Commands
3.26.1
No Operation Command
The No Operation Command (NOP) should be used in
cases when the SDRAM is in a idle or a wait state. The
purpose of the No Operation Command is to prevent
the SDRAM from registering any unwanted commands
between operations. A No Operation Command is
registered when CS is LOW with RAS, CAS, and WE
held HIGH at the rising edge of the clock. A No
Operation Command will not terminate a previous
operation that is still executing, such as a burst read or
write cycle.
3.26.2
Deselect Command
The Deselect Command performs the same function as
a No Operation Command. Deselect Command occurs
when CS is brought HIGH, the RAS, CAS, and WE
signals become don’t care.
T0
T2
T1
T3
T4
Tn
CMD
CKE
CK, CK
Auto
Refresh
ARPD
tRFC
tis
tXP
Valid
Command
CKE can go low one clock after an Auto-Refresh command
When tRFC expires the DRAM is in Precharge Power-Down Mode
T0
T2
T1
T3
T4
T5
T6
T7
CMD
CKE
CK, CK
MRS or
EMRS
MRS_PD
t
MRD
Enters Precharge Power-Down Mode
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