EDD1204ALTA, EDD1208ALTA, EDD1216ALTA
10. Auto Precharge
During a read or write command cycle, A10 controls auto precharge. A10 high in the read or write command (read
with auto precharge command or write with auto precharge command), auto precharge is selected and begin
automatically.
The tRAS must be satisfied with a read with auto precharge or a write with auto precharge operation. In addition, the
next activate command to the bank being precharged cannot be executed until the precharge cycle ends.
In read cycle, once auto precharge starts, an activate command to the bank can be issued after tRP is satisfied.
In write cycle, tDAL must be satisfied to issue the next activate command to the bank being precharged.
10.1 Read with Auto Precharge
When a read with auto precharge command is issued, the auto precharge begins (Burst length / 2) clocks later from
a read with auto precharge command.
Burst length = 4
T0
T1
T2
T3
T4
T5
Burst length / 2 cycle
tRP
CLK
/CLK
CKE
/CAS latency = 2
Command
READA
ACT
Auto precharge starts
Hi-Z
DQ
Q1
Q2
Q3
Q4
/CAS latency = 2.5
READA
ACT
Command
Auto precharge starts
Hi-Z
DQ
Q1
Q2
Q3
Q4
(When tRAS is satisfied)
Remark READA means Read with Auto Precharge command
28
Preliminary Data Sheet E0136E30
ELPIDA [ ELPIDA MEMORY ]
