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RMLD232UAW Datasheet(PDF) 24 Page - Emerging Memory & Logic Solutions Inc

Part # RMLD232UAW
Description  2M x 32 bit Low Power DDR SDRAM
PDF  50 Pages
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Manufacturer  EMLSI [Emerging Memory & Logic Solutions Inc]
Direct Link  http://www.emlsi.com
Logo EMLSI - Emerging Memory & Logic Solutions Inc

RMLD232UAW Datasheet(HTML) 24 Page - Emerging Memory & Logic Solutions Inc

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24
Rev 0.7
64Mb Low Power DDR SDRAM
Advanced
Command Truth Tabe (V=Valid, X=Don,t Care, H=Logic High, L=Logic Low)
1. OP Code : Operation Code. A0 ~ A10 & BA0 ~ BA1 : Program keys. (@EMRS/MRS)
2. EMRS/MRS can be issued only at all banks precharge state.
A new command can be issued 2 clock cycles after EMRS or MRS.
3. Auto refresh functions are same as the CBR refresh of DRAM.
The automatical precharge without row precharge command is meant by “Auto”.
Auto/self refresh can be issued only at all banks precharge state.
4. BA0 ~ BA1 : Bank select addresses.
5. If A10/AP is “High” at row precharge, BA0 and BA1are ignored and all banks are selected.
6. During burst write with auto precharge, new read/write command can not be issued.
Another bank read/write command can be issued after the end of burst.
New row active of the associated bank can be issued at tRP after the end of burst.
7. Burst stop command is valid at every burst length.
8. DM sampled at the rising and falling edges of the DQS and Data-in are masked at the both edges (Write DM latency is 0).
9. This combination is not defined for any function, which means “No Operation(NOP)” in DDR SDRAM.
COMMAND
CKEn-1
CKEn
CS
RAS
CAS
WE
BA0,1
A10/AP
A9 ~ A0
Note
Register
Mode Register Set
H
X
L
L
L
L
OP CODE
1,2
Refresh
Auto Refresh
H
H
L
L
L
H
X
3
Self
Refresh
Entry
L
3
Exit
L
H
L
H
H
H
X
3
H
X
X
X
3
Bank Active & Row Addr.
H
X
L
L
H
H
V
Row Address
Read &
Column
Address
Auto Precharge Disable
H
X
L
H
L
H
V
L
Column
Address
(A0 ~ A7)
4
Auto Precharge Enable
H
4
Wrie &
Column
Address
Auto Precharge Disable
H
X
L
H
L
L
V
L
Column
Address
(A0 ~ A7)
4
Auto Precharge Enable
H
4, 6
Deep Power Down
Entry
H
L
L
H
H
L
X
Exit
L
H
H
X
X
X
Burst Stop
H
X
L
H
H
L
X
7
Precharge
Bank Selection
H
X
L
L
H
L
V
L
X
All Banks
X
H
5
Active Power Down
Entry
H
L
H
X
X
X
X
L
V
V
V
Exit
L
H
X
X
X
X
Precharge Power Down Mode
Entry
H
L
H
X
X
X
X
L
H
H
H
Exit
L
H
H
X
X
X
L
V
V
V
DM
H
X
X
8
No operation (NOP) : Not defined
H
X
H
X
X
X
X
9
L
H
H
H
9



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