V58C2128(804/404/164)S
TRUTH TABLE 4 – Current State Bank n - Command to Bank m
(Notes: 1-6; notes appear below and on next page)
CURRENT STATE /CS /RAS /CAS /WE
COMMAND/ACTION
NOTES
H
L
X
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 m
ACTIVE (select and activate row)
Any
Idle
H
H
L
READ (select column and start READ burst)
WRITE (select column and start WRITE burst)
PRECHARGE
7
7
Row Activating,
Active, or Precharging
L
H
H
L
L
L
H
H
L
ACTIVE (select and activate row)
Read
(Auto-Precharge
Disabled)
H
L
READ (select column and start new READ burst)
PRECHARGE
7
H
H
L
L
H
H
L
ACTIVE (select and activate row)
Write
H
H
L
READ (select column and start READ burst)
WRITE (select column and start new WRITE burst)
PRECHARGE
7, 8
7
(Auto- Precharge
Disabled)
L
H
H
L
L
L
H
H
L
ACTIVE (select and activate row)
H
H
L
READ (select column and start new READ burst)
WRITE (select column and start WRITE burst)
PRECHARGE
3a, 7
Read
(With Auto-Precharge)
L
3a, 7, 9
H
H
L
L
L
H
H
L
ACTIVE (select and activate row)
H
H
L
READ (select column and start READ burst)
WRITE (select column and start new WRITE burst)
PRECHARGE
3a, 7
3a, 7
Write
(With Auto-Precharge)
L
H
L
NOTE:
t
1. This table applies when CKE was HIGH and CKE is HIGH (see Truth Table 2) and after XSR has been met
n-1
n
(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:
t
Idle: The bank has been precharged, and RP has been met.
t
Row Active: A row in the bank has been activated, and RCD 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.
V58C2128(804/404/164)S Rev. 1.6 March 2002
30
MOSEL [ MOSEL VITELIC, CORP ]
