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EDD2508AKTA-5 Datasheet(PDF) 26 Page - Elpida Memory

Part No. EDD2508AKTA-5
Description  256M bits DDR SDRAM (32M words x 8 bits, DDR400)
Download  48 Pages
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Manufacturer  ELPIDA [Elpida Memory]
Direct Link  http://www.elpida.com/en
Logo ELPIDA - Elpida Memory

EDD2508AKTA-5 Datasheet(HTML) 26 Page - Elpida Memory

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EDD2508AKTA-5
Preliminary Data Sheet E0349E60 (Ver. 6.0)
26
Auto Precharge
Read with auto-precharge
The precharge is automatically performed after completing a read operation. The precharge starts tRPD (BL/2)
cycle after READA command input. tRAP specification for READA allows a read command with auto precharge to be
issued to a bank that has been activated (opened) but has not yet satisfied the tRAS (min) specification. A column
command to the other active bank can be issued the next cycle after the last data output. Read with auto-precharge
command does not limit row commands execution for other bank. Refer to ‘Function truth table and related
note(Notes.*14).
out0
out1
out2
out3
CK
/CK
DQ
Command
tRP (min)
tRAP (min) = tRCD (min)
ACT
Note: Internal auto-precharge starts at the timing indicated by "
".
NOP
2 cycles (= BL/2)
READA
ACT
DQS
tAC,tDQSCK
tRPD
Read with auto-precharge
Write with auto-precharge
The precharge is automatically performed after completing a burst write operation. The precharge operation is
started (BL/ 2 + 4) cycles after WRITA command issued. A column command to the other banks can be issued the
next cycle after the internal precharge command issued. Write with auto-precharge command does not limit row
commands execution for other bank. Refer to the ‘Read with Auto-Precharge Enabled, Write with Auto-Precharge
Enabled’ section. Refer to ‘Function truth table and related note(Notes.*14)‘.
in1
in2
in3
in4
CK
/CK
DQ
Command
DM
tRAS (min)
tRCD (min)
tRP
DQS
ACT
WRITA
ACT
BL/2 + 4 cycles
Note: Internal auto-precharge starts at the timing indicated by "
".
BL = 4
NOP
NOP
Burst Write (BL = 4)


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