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Rev. A | Apr. 2012
IS42/45SM/RM/VM16800G
Table5: Function Truth Table
Current
State
Command
Action Note
/CS /RAS /CAS /WE BA A0-A11 Description
Precharging
L L L L OP CODE Mode Register Set ILLEGAL 13,14
L L L H X X Auto or Self Refresh ILLEGAL 13
L L H L BA X Precharge
No Operation : Bank(s)
Idle after tRP
L L H H BA Row Add. Bank Activate ILLEGAL 4,12
L H L L BA Col Add./ A10 Write/WriteAP ILLEGAL 4,12
L H L H BA Col Add./ A10 Read/ReadAP ILLEGAL 4,12
L H H H X X No Operation
No Operation : Bank(s)
Idle after tRP
H X X X X X Device Deselect
No Operation : Bank(s)
Idle after tRP
Row
Activating
L L L L OP CODE Mode Register Set ILLEGAL 13,14
L L L H X X Auto or Self Refresh ILLEGAL 13
L
L H L BA X Precharge ILLEGAL 4,12
L L H H BA Row Add. Bank Activate ILLEGAL 4,11,12
L H L L BA Col Add./A10 Write/Write AP ILLEGAL 4,12
L H L H BA Col Add./A10 Read/Read AP ILLEGAL 4,12
L H H H X X No Operation
No Operation : ROw
Active after tRCD
H X X X X X Device Deselect
No Operation : ROw
Active after tRCD
Write
Recovering
L L L L OP CODE Mode Register Set ILLEGAL 13,14
L L L H X X Auto or Self Refresh ILLEGAL 13
L L H L BA X Precharge ILLEGAL 4,13
L L H H BA Row Add. Bank Activate ILLEGAL 4,12
L H L L BA Col Add./A10 Write/WriteAP
Start Write : Optional
AP(A10=H)
L H L H
BA Col Add./A10 Read/Read AP
Start Write : Optional
AP(A10=H)
9
L H H H X X No Operation
No Operation : Row
Active after tDPL
H X X X X X Device Deselect
No Operation : Row
Active after tDPL
