EM639165
[ Read Interrupted by Precharge ]
Burst read operation can be interrupted by precharge of the
same bank . READ to PRE interval is minimum 1 CLK. A PRE
command to output disable latency is equivalent to the /CAS
Latency. As a result, READ to PRE interval determines valid
data length to be output. The figure below shows examples of
BL=4.
Read Interrupted by Precharge (BL=4)
CLK
Command
DQ
PRE
READ
READ
READ
Q0
Q1
Q1
Q2
Command
DQ
PRE
CL=3
Q0
Command
DQ
PRE
Q0
Command
DQ
READ
READ
PRE
Q1
Q0
Q2
PRE
Q0
Command
DQ
CL=2
Q1
Command
DQ
READ PRE
Q0
Preliminary
Rev 1.0 Feb. 2001
19
ETRON [ ETRON TECHNOLOGY, INC. ]
