Integrated Silicon Solution, Inc. — 1-800-379-4774
27
Rev. 00A
07/11/05
ISSI
®
IS43R16800A
Command Intervals
A Read command to the consecutive Read command Interval
Destination row of the
consecutive read command
Bank
address
Row address State Operation
1. Same Same ACTIVE
The consecutive read can be performed after an interval of no less than 1 cycle to
interrupt the preceding read operation.
2. Same Different —
Precharge the bank to interrupt the preceding read operation. tRP after the
precharge command, issue the ACT command. tRCD after the ACT command, the
consecutive read command can be issued. See ‘A read command to the
consecutive precharge interval’ section.
3. Different Any ACTIVE
The consecutive read can be performed after an interval of no less than 1 cycle to
interrupt the preceding read operation.
IDLE
Precharge the bank without interrupting the preceding read operation. tRP after
the precharge command, issue the ACT command. tRCD after the ACT command,
the consecutive read command can be issued.
out
A0
out
A1
out
B0
out
B1
out
B2
out
B3
CK
/CK
Address
BA
DQ
DQS
Command
t0 t4 t5 t6 t7 t8 t9 t10
Bank0
Active
CL = 3
BL = 4
Bank0
NOP
ACT NOP READ
Row Column A
READ
Column B
Column = A
Read
Column = B
Read
Column = A
Dout
Column = B
Dout
t11
READ to READ Command Interval (same ROW address in the same bank)
