HY[B/E]18L128160B[C/F]-7.5
128-Mbit Mobile-RAM
Functional DescriptionFunction Truth Tables
Table 16
Current State Bank n - Command to Bank m (different bank)
Current State CS RAS CAS WE Command / Action
Notes
1)2)3)4)5)6)
Any
H
L
X
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
X
H
X
L
X
H
X
H
L
X
H
X
H
H
L
DESELECT (NOP / continue previous operation)
NO OPERATION (NOP / continue previous operation)
Any command otherwise allowed to bank n
ACTIVE (select and activate row)
to
to
Idle
to
Row
to 7)
to
Activating,
Active, or
Precharging
H
H
L
READ (select column and start READ burst)
WRITE (select column and start WRITE burst)
PRECHARGE (deactivate row in bank or banks)
ACTIVE (select and activate row)
L
to
H
H
L
L
to
Read (Auto-
Precharge
Disabled)
L
H
H
L
to
H
H
L
READ (select column and start READ burst)
WRITE (select column and start WRITE burst)
PRECHARGE (deactivate row in bank or banks)
ACTIVE (select and activate row)
to 8)
to
L
H
H
L
L
to
Write (Auto-
Precharge
Disabled)
L
H
H
L
to
H
H
L
READ (select column and start READ burst)
WRITE (select column and start WRITE burst)
PRECHARGE (deactivate row in bank or banks)
ACTIVE (select and activate row)
to
L
to
H
H
L
L
to
Read
(with Auto-
Precharge)
L
H
H
L
to , 9)
to
H
H
L
READ (select column and start READ burst)
WRITE (select column and start WRITE burst)
PRECHARGE (deactivate row in bank or banks)
ACTIVE (select and activate row)
L
to
H
H
L
L
to
Write
(with Auto-
Precharge)
L
H
H
L
to ,
to ,
to
H
H
L
READ (select column and start READ burst)
WRITE (select column and start WRITE burst)
PRECHARGE (deactivate row in bank or banks)
L
H
L
1) This table applies when CKEn-1 was HIGH and CKEn is HIGH and after tRC has been met (if the previous state was Self
Refresh).
2) This table describes alternate bank operation, except where noted, i.e., the current state is for bank n and the commands
shown are those allowed to be issued to bank m (assuming that bank m is in such a state that the given command is
allowable). Exceptions are covered in the notes below.
3) Current state definitions:
Idle:The bank has been precharged, and tRP has been met.
Row Active:A row in the bank has been activated, and tRCD has been met. No data bursts/accesses and no register
accesses are in progress.
Read:A READ burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been
terminated.
Write:A WRITE burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been
terminated.
Read with AP
Enabled:Starts with registration of a READ command with Auto Precharge enabled and ends when tRP has been
met. Once tRP is met, the bank is in the idle state.
Write with AP
Enabled:Starts with registration of a WRITE command with Auto Precharge enabled and ends when tRP has been
met. Once tRP is met, the bank is in the idle state.
4) AUTO REFRESH, SELF REFRESH and MODE REGISTER SET commands may only be issued when all banks are idle.
5) A BURST TERMINATE command cannot be issued to another bank; it applies to the bank represented by the current state
only.
6) All states and sequences not shown are illegal or reserved.
Data Sheet
43
Rev. 1.71, 2007-01
05282004-NZNK-8T0D
QIMONDA [ QIMONDA AG ]
