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EDD2508AKTA-5 Datasheet(PDF) 17 Page - Elpida Memory

Part # EDD2508AKTA-5
Description  256M bits DDR SDRAM (32M words x 8 bits, DDR400)
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Manufacturer  ELPIDA [Elpida Memory]
Direct Link  http://www.elpida.com/en
Logo ELPIDA - Elpida Memory

EDD2508AKTA-5 Datasheet(HTML) 17 Page - Elpida Memory

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EDD2508AKTA-5
Preliminary Data Sheet E0349E60 (Ver. 6.0)
17
Current state
/CS
/RAS
/CAS /WE
Address
Command
Operation
Next state
Write with auto-
pre-charge*
10
H
×
×
×
×
DESL
NOP
Precharging
L
H
H
H
×
NOP
NOP
Precharging
L
H
H
L
×
BST
ILLEGAL
L
H
L
H
BA, CA, A10
READ/READA
ILLEGAL*
14
L
H
L
L
BA, CA, A10
WRIT/WRIT A
ILLEGAL*
14
L
L
H
H
BA, RA
ACT
ILLEGAL*
11, 14
L
L
H
L
BA, A10
PRE, PALL
ILLEGAL*
11, 14
L
L
L
×
×
ILLEGAL
Remark: H: VIH. L: VIL.
×: VIH or VIL
Notes: 1. The DDR SDRAM is in "Precharging" state for tRP after precharge command is issued.
2. The DDR SDRAM reaches "IDLE" state tRP after precharge command is issued.
3. The DDR SDRAM is in "Refresh" state for tRFC after auto-refresh command is issued.
4. The DDR SDRAM is in "Activating" state for tRCD after ACT command is issued.
5. The DDR SDRAM is in "Active" state after "Activating" is completed.
6. The DDR SDRAM is in "READ" state until burst data have been output and DQ output circuits are turned
off.
7. The DDR SDRAM is in "READ with auto-precharge" from READA command until burst data has been
output and DQ output circuits are turned off.
8. The DDR SDRAM is in "WRITE" state from WRIT command to the last burst data are input.
9. The DDR SDRAM is in "Write recovering" for tWR after the last data are input.
10. The DDR SDRAM is in "Write with auto-precharge" until tWR after the last data has been input.
11. This command may be issued for other banks, depending on the state of the banks.
12. All banks must be in "IDLE".
13. Before executing a write command to stop the preceding burst read operation, BST command must be
issued.
14. The DDR SDRAM supports the concurrent auto-precharge feature, a read with auto-precharge enabled,or
a write with auto-precharge enabled, may be followed by any column command to other banks, as long as
that command does not interrupt the read or write data transfer, and all other related limitations apply.
(E.g. Conflict between READ data and WRITE data must be avoided.)
The minimum delay from a read or write command with auto precharge enabled, to a command to a
different bank, is summarized below.
From command
To command (different bank, non-
interrupting command)
Minimum delay
(Concurrent AP supported)
Units
Read w/AP
Read or Read w/AP
BL/2
tCK
Write or Write w/AP
CL(rounded up)+ (BL/2)
tCK
Precharge or Activate
1
tCK
Write w/AP
Read or Read w/AP
1 + (BL/2) + tWTR
tCK
Write or Write w/AP
BL/2
tCK
Precharge or Activate
1
tCK


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