EM42AM1684RTA Datasheet, PDF (10/19 Pages) Eorex Corporation – 256Mb (4M×4Bank×16) Double DATA RATE SDRAM

eorex
EM42AM1684RTA
1. Command Truth Table
Command
Symbol
CKE
n-1 n
/CS
/RAS
/CAS
/WE
BA0,
BA1
A10
A12~A0
Ignore Command
DESL H X H X
X XXX
X
No Operation
NOP H X L H
H HXX
X
Burst Stop
BSTH H X L H
H
L XX
X
Read
READ H X L H
L HVL
V
Read with Auto Pre-charge READA H X L H
L HVH
V
Write
WRIT H X L H
L
LVL
V
Write with Auto Pre-charge WRITA H X L L
H HVH
V
Bank Activate
ACT H X L L
H HVV
V
Pre-charge Select Bank
PRE H X L L
H L VL
X
Pre-charge All Banks
PALL H X L L
H L XH
X
Mode Register Set
MRS H X L L
L
L
L
L
V
H = High level, L = Low level, X = High or Low level (Don't care), V = Valid data input
2. CKE Truth Table
Item
Command
Symbol ^CKE /CS /RAS /CAS /WE Addr.
n-1 n
Idle
CBR Refresh Command
REF H H L L
LH
X
Idle
Self Refresh Entry
SELF H L L L
LH
X
Self Refresh Self Refresh Exit
LHL _H
HH
X
LHH X
XX
X
Idle
Power Down Entry
HL X X
XX
X
Power Down Power Down Exit
LHX X
XX
X
Remark H = High level, L = Low level, X = High or Low level (Don't care)
Jul. 2006
10/19
www.eorex.com