Integrated Silicon Solution, Inc. — 1-800-379-4774
35
Rev. 00A
07/11/05
ISSI
®
IS43R16800A
A Read command to the consecutive 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.
out0 out1 out2 out3
CK
/CK
DQ
DQS
Command
t1t0 t2 t3 t4 t5 t6 t7 t8
tRPD = BL/2
READ
NOP NOP NOP
PRE/
PALL
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.
out0 out1
CK
/CK
DQ
DQS
Command
t1t0 t2 t3 t4 t5 t6 t7 t8
High-Z
High-Z
tHZP
CL = 3
READ
NOP NOP
PRE/PALL
READ to PRECHARGE Command Interval (same bank): To stop output data (CL = 3, BL = 2, 4, 8)
