EDD51323DBH-LS
Auto Precharge
Read with Auto Precharge
The precharge is automatically performed after completing a read operation. The precharge starts BL/2 (= tRPD)
clocks after READA command input. tRAS lock out mechanism 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.
CK
/CK
tRP (min)
tRAS (min)
tRCD (min)
BL/2 (= tRPD)
ACT
READA
NOP
ACT
Command
DQS
tAC,tDQSCK
DQ
out0 out1 out2 out3
Note: Internal auto-precharge starts at the timing indicated by " ".
Read with auto precharge
Write with Auto Precharge
The precharge is automatically performed after completing a burst write operation. The precharge operation is
started Write latency (WL) + BL/2 + tWR (= tWPD) clocks 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.
CK
/CK
tRAS (min)
tRP
tRCD (min)
ACT
NOP
WRITA
NOP
ACT
Command
WL + BL/2 + tWR (= tWPD)
DM
DQS
DQ
in1 in2 in3 in4
BL = 4
Note: Internal auto-precharge starts at the timing indicated by " ".
Burst Write (BL = 4)
Preliminary Data Sheet E1432E20 (Ver. 2.0)
30
ELPIDA [ ELPIDA MEMORY ]
