VG36644041DT / VG36648041DT / VG36641641DT
CMOS Synchronous Dynamic RAM
VIS
Basic Features and Function Description
1. Simplified State Diagram
Self
Refresh
Mode
Register
Set
MRS
AUTO
REF
IDLE
Refresh
Power
Down
Active
Power
Down
CKE
ROW
ACTIVE
CKE
Read
Write (Write recovery)
CKE
READ
SUSPEND
Read (write recovery)
Write
CKE
CKE
WRITE
READ
WRITE
SUSPEND
CKE
Write with
Read with
Auto Precharge
CKE
Auto Precharge
CKE
READA
WRITE A
SUSPEND
WRITE A
READ A
SUSPEND
CKE
CKE
Precharge
POWER
Precharge
ON
Automatic sequence
Manual input
Note: After the AUTO refresh operation, precharge operation is
performed automatically and enter the IDLE state
Document :1G5-0177
Rev.2
Page9
VML [ VANGUARD INTERNATIONAL SEMICONDUCTOR ]
