Integrated Silicon Solution, Inc. — 1-800-379-4774
37
Rev. 00A
07/11/05
ISSI
®
IS43R16800A
Bank active command interval
Destination row of the consecutive ACT
command
Bank
address
Row address
State
Operation
1. Same Any ACTIVE
Two successive ACT commands can be issued at tRC interval. In between two
successive ACT operations, precharge command should be executed.
2. Different Any ACTIVE
Precharge the bank. tRP after the precharge command, the consecutive ACT
command can be issued.
IDLE tRRD after an ACT command, the next ACT command can be issued.
CK
/CK
Command
BA
tRC
Address
ACTV
tRRD
Bank0
Active
Bank3
Active
Bank0
Precharge
Bank0
Active
PRE
ACT
ROW: 0
NOP NOPNOPACT
ACT
ROW: 1ROW: 0
Bank Active to Bank Active
Mode register set to Bank-active command interval
The interval between setting the mode register and executing a bank-active command must be no less than tMRD.
CK
/CK
Command
Address
NOP NOPMRS ACT
tMRD
Mode Register Set Bank3
Active
CODE BS and ROW
