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3.3.6
Command Table
Table 4.
Command List
Command
Command inhibit (NOP)
No operation (NOP)
Active (select bank and
row activate)
Read (select bank and
column and start read
burst)
Write (select bank and
column and start write
burst)
Burst stop (for SDR only)
Precharge (deactivate row
in a bank or all banks)
Autoprecharge is not
supported
Autorefresh
Selfrefresh Entry
Selfrefresh Exit
MRS, EMRS0, EMRS1
(EMRS1 for M-SDR and
M-DDR only)
Power down entry
Power down exit
Deep power down entry
SPRU749A
Table 4 lists the commands.
CS
RAS
CAS
H
X
X
L
X
X
L
L
H
L
H
L
L
H
L
L
H
H
L
L
H
L
L
L
L
L
L
X
X
X
L
L
L
H
X
X
H
X
X
L
H
H
WE
CKE
ADDR
X
H
X
X
H
X
H
H
Bank/Row
H
H
Bank/Col
L
H
Bank/Col
L
H
X
L
H
A10
Low – Bank selected by BA1 and BA0
(for 4 bank) and BA0 (for 2 bank)
High – All banks to be precharged
H
H
X
H → L X
H
L → H X
X
L
H
Op Code
[BA1:BA0] = 01: EMRS0
[BA1:BA0] = 10: EMRS1
H → L X
X
L → H X
X
H → L X
L
OMAP3.2 Subsystem
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