512Mb : 32 Me g x 16, 16 Me g x 32 Mo b ile SDRAM
Tru t h Ta b le s
Ta b le 8:
Tru t h Ta b le – Cu rre n t St a t e Ba n k n , Co m m a n d t o Ba n k m
Notes: 1–6; notes appear below and on next page
Cu rre n t St a t e
CS#
RAS# CAS# WE# Co m m a n d (Act io n )
No t e s
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
COMMAND INHIBIT (NOP/Continue previous operation)
NO OPERATION (NOP/Continue previous operation)
Any command otherwise allowed to bank m
ACTIVE (Select and activate row)
Idle
Row
activating,
active, or
precharging
H
H
L
7
7
READ (Select column and start READ burst)
WRITE (Select column and start WRITE burst)
PRECHARGE
L
H
H
L
L
Read
(auto precharge
disabled)
L
H
H
L
ACTIVE (Select and activate row)
H
H
L
7, 8
7, 9
10
READ (Select column and start new READ burst)
WRITE (Select column and start WRITE burst)
PRECHARGE
L
H
H
L
L
Write
(auto precharge
disabled)
L
H
H
L
ACTIVE (Select and activate row)
H
H
L
7, 11
7, 12
10
READ (Select column and start READ burst)
WRITE (Select column and start new WRITE burst)
PRECHARGE
L
H
H
L
L
Read
(with auto
precharge)
L
H
H
L
ACTIVE (Select and activate row)
H
H
L
7, 13, 14
7, 13, 15
10
READ (Select column and start new READ burst)
WRITE (Select column and start WRITE burst)
PRECHARGE
L
H
H
L
L
Write
(with auto
precharge)
L
H
H
L
ACTIVE (Select and activate row)
H
H
L
7, 13, 16
7, 13, 17
10
READ (Select column and start READ burst)
WRITE (Select column and start new WRITE burst)
PRECHARGE
L
H
L
Notes: 1. This table applies when CKEn-1 was HIGH and CKEn is HIGH (Table 6 on page 41) and after
tXSR 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:
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.
Read w/auto-
precharge enabled:
Starts with registration of a READ command with auto precharge
enabled and ends when RP has been met. Once RP is met, the bank
will be in the idle state.
t
t
Write w/auto-
precharge enabled:
Starts with registration of a WRITE command with auto precharge
t
enabled and ends whentRP has been met. Once RP is met, the bank
will be in the idle state.
4. AUTO REFRESH, SELF REFRESH and LOAD MODE REGISTER commands may only be issued
when all banks are idle.
PDF: 09005aef81ca5de4/Source: 09005aef81ca5e03
MT48H32M16LF_1.fm - Rev. H 6/07 EN
Micron Technology, Inc., reserves the right to change products or specifications without notice.
44
©2005 Micron Technology, Inc. All rights reserved.
MICRON [ MICRON TECHNOLOGY ]
