![](http://datasheet.mmic.net.cn/380000/EDS1232CABB_datasheet_16755639/EDS1232CABB_20.png)
EDS1232CABB, EDS1232CATA
Preliminary Data Sheet E0247E40 (Ver. 4.0)
20
Current state
/CS /RAS /CAS /WE Address
Command
Operation
Notes
Write recovering H
×
×
×
×
×
DESL
Nop
→
Enter row active after tDPL
Nop
→
Enter row active after tDPL
L
H
H
H
NOP
L
H
H
L
×
BST
READ/READA
Nop
→
Enter row active after tDPL
L
H
L
H
BA, CA, A10
Start read, Determine AP
8
L
H
L
L
BA, CA, A10
WRIT/ WRITA
New write, Determine AP
L
L
H
H
BA, RA
ACT
ILLEGAL
3
L
L
H
L
BA, A10
PRE/PALL
ILLEGAL
3
L
L
L
H
×
REF/SELF
ILLEGAL
Write recovering H
L
L
L
L
OPCODE
MRS
ILLEGAL
×
×
×
×
DESL
Nop
→
Enter precharge after tDPL
with auto
L
H
H
H
×
NOP
Nop
→
Enter precharge after tDPL
precharge
L
H
H
L
×
BST
Nop
→
Enter row active after tDPL
L
H
L
H
BA, CA, A10
READ/READA
ILLEGAL
L
H
L
L
BA, CA, A10
WRIT/WRITA
ILLEGAL
3, 8
L
L
H
H
BA, RA
ACT
ILLEGAL
3
L
L
H
L
BA, A10
PRE/PALL
ILLEGAL
3
L
L
L
H
×
REF/SELF
ILLEGAL
Refresh
L
L
L
L
OPCODE
MRS
ILLEGAL
H
×
×
×
×
DESL
Nop
→
Enter idle after tRC
L
H
H
H
×
NOP/BST
Nop
→
Enter idle after tRC
L
H
H
L
×
READ/READA
ILLEGAL
L
H
L
H
×
ACT/PRE/PALL ILLEGAL
Mode register
L
H
L
L
×
REF/SELF/MRS ILLEGAL
H
×
×
×
×
DESL
Nop
→
Enter idle after tRSC
accessing
L
H
H
H
×
NOP
Nop
→
Enter idle after tRSC
L
H
H
L
×
BST
ILLEGAL
L
H
L
H
×
READ/READA
ACT/PRE/PLL/
ILLEGAL
L
L
L
L
×
Remark: H: VIH. L: VIL.
×
: VIH or VIL, V = Valid data
BA: Bank Address, CA: Column Address, RA: Row Address
Notes: 1. All entries assume that CKE was active (High level) during the preceding clock cycle.
2. If all banks are idle, and CKE is inactive (Low level), the Synchronous DRAM will enter Power down
mode.
3. Illegal to bank in specified states; Function may be legal in the bank indicated by Bank Address (BA),
depending on the state of that bank.
4. If all banks are idle, and CKE is inactive (Low level), the Synchronous DRAM will enter Self refresh mode.
All input buffers except CKE will be disabled.
5. Illegal if tRCD is not satisfied.
6. Illegal if tRAS is not satisfied.
7. Must satisfy burst interrupt condition.
8. Must satisfy bus contention, bus trun around, and/or write recovery requirements.
9. Must mask preceding data which don’t satisfy tDPL.
10. Illegal if tRRD is not satisfied.