EDD51323DBH-LS
A READ Command to the Consecutive Precharge Command Interval
Operation by each case of destination bank of the consecutive Precharge command.
Bank address
Operation
The PRE and PALL command can interrupt a read operation.
1.
2.
Same
To complete a burst read operation, tRPD is required between the read and the precharge
command. Please refer to the following timing chart.
The PRE command does not interrupt a read command.
No interval timing is required between the read and the precharge command.
Different
READ to PRECHARGE Command Interval (same bank) : To output all data
To complete a burst read operation and get a burst length of data, the consecutive precharge command must be
issued tRPD (= BL/ 2 cycles) after the read command is issued.
t0
t1
t2
t3
t4
t5
t6
t7
t8
CK
/CK
PRE/
PALL
Command
DQ
NOP
READ
NOP
NOP
out0 out1 out2 out3
DQS
tRPD = BL/2
READ to PRECHARGE Command Interval (same bank): To output all data (CL = 3, BL = 4)
READ to PRECHARGE Command Interval (same bank): To stop output data
A burst data output can be interrupted with a precharge command. All DQ pins and DQS pins become high-Z tHZP
(= CL) after the precharge command.
t0
t1
t2
t3
t4
t5
t6
t7
t8
CK
/CK
Command
DQ
NOP
READ PRE/PALL
NOP
High-Z
High-Z
out0 out1
DQS
tHZP
READ to PRECHARGE Command Interval (same bank): To stop output data (CL = 3, BL = 4, 8)
Preliminary Data Sheet E1432E20 (Ver. 2.0)
41
ELPIDA [ ELPIDA MEMORY ]
