FEDD56V16161N-01 Datasheet, PDF (17/44 Pages) Rohm – SYNCHRONOUS DYNAMIC RAM

FEDD56V16161N-01
MSM56V16161N
Write / Write interrupt
When a new write command is issued to same bank during write cycle or another active bank, current burst write is
terminated and new burst write start. When a new write command is issued to another bank during a write with
auto-precharge cycle, current burst is terminated and a new write command start. Then, current bank is precharged
after specified time. Don’t issue a new write command to same bank during write with auto-precharge cycle.
Write / Write interrupt cycle
CLK
CL=2 or 3, BL=4, WM=Burst
tCCD
tCCD
Command
WRTa WRTb
WRTc
DQ
Da0 Db0 Db1 Dc0 Dc1 Dc2 Dc3
CL=2 or 3, BL=4, WM=Burst
Command
DQ
WRTa
WRTAb
tCCD
tWR
Da0 Da1 Db0 Db1 Db2 Db3
Auto Precharge Start
tRP
ACT
CL=2 or 3, BL=4, WM=Burst
Command
WRTA _tCCD WRTA
Bank Address
A
B
Bank A Internal State ^{Burst Write}
tWR + 1clk
Burst Interrupt,
Write Recovery
tRP
Auto Precharge
Bank B Internal State Row Active
Burst Write
tWR
Write
Recovery
ACT
A
ACT
tRRD
B
Row Active
tRP
Row
Auto Precharge Active
DQ
DA0 DA1 DB0 DB1 DB2 DB3
17/44