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48SD1616 Datasheet(PDF) 13 Page - Maxwell Technologies

Part # 48SD1616
Description  256 Mb SDRAM 4-Meg X 16-Bit X 4-Banks
PDF  42 Pages
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Manufacturer  MAXWELL [Maxwell Technologies]
Direct Link  http://www.maxwell.com
Logo MAXWELL - Maxwell Technologies

48SD1616 Datasheet(HTML) 13 Page - Maxwell Technologies

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48SD1616
13
All data sheets are subject to change without notice
©2005 Maxwell Technologies
All rights reserved.
256Mb (4-Meg X 16-Bit X 4-Banks) SDRAM
01.07.05 REV 4
Function Truth Table
The following function table shows the operations that are performed when each command is issued in each
mode of the SDRAM.
The following table assumes that CKE is High.
CURRENT STATE
CS
RAS
CAS
WE
ADDRESS
COMMAND
OPERATION
Precharge
H
x
x
x
x
DESL
Enter IDLE after t
RP
L
H
H
H
x
NOP
Enter IDLE after t
RP
L
H
L
H
BA, CA, A10
READ/READ A
ILLEGAL1
L
H
L
L
BA, CA, A10
WRIT/WRIT A
ILLEGAL1
L
L
H
H
BA, RA
ACTV
ILLEGAL1
L
L
H
L
BA, A10
PRE, PALL
NOP2
L
L
L
H
x
REF, SELF
ILLEGAL
L
L
L
L
MODE
MRS
ILLEGAL
Idle
H
x
x
x
x
DESL
NOP
LH
H
H
x
NOP
NOP
L
H
L
H
BA, CA, A10
READ/READ A
ILLEGAL3
L
H
L
L
BA, CA, A10
WRIT/WRIT A
ILLEGAL3
L
L
H
H
BA, RA
ACTV
Bank and row active
L
L
H
L
BA, A10
PRE, PALL
NOP
L
L
L
H
x
REF, SELF
Refresh
L
L
L
L
MODE
MRS
Mode register set
Row active
H
x
x
x
x
DESL
NOP
LH
H
H
x
NOP
NOP
L
H
L
H
BA, CA, A10
READ/READ A
Begin read
L
H
L
L
BA, CA, A10
WRIT/WRIT A
Begin write
L
L
H
H
BA, RA
ACTV
Other bank active
ILLEGAL on same bank4
L
L
H
L
BA, A10
PRE, PALL
Precharge
L
L
L
H
x
REF, SELF
ILLEGAL
L
L
L
L
MODE
MRS
ILLEGAL



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