EMD3D256M08BS1
EMD3D256M16BS1
TRUTH TABLES
Command Truth Table
Table 12 – Command Truth Table
Notes 1-5 apply to the entire Table.
CKE
BA
A13-
A15
A10/ A0-A9,
A12/
BC
Symbol
Notes
Function
CS RAS CAS WE
[2:0]
AP
A11
Prev.
Next
Mode Register Set
Refresh
MRS
REF
H
H
L
L
L
L
BA
Op. Code
Self Refresh Entry
Self Refresh Exit
SRE
Not used for STT-MRAM
SRX
Single Bank Precharge
Precharge All Banks
Bank ACTIVE
PRE
H
H
H
H
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
H
H
H
L
L
L
H
L
L
L
BA
L
V
L
V
L
L
V
V
PREA
ACT
WR
H
L
BA
Row Address (RA)
WRITE (Fixed BL8 pr BC4)
WRITE (BC4 on the Fly)
WRITE (BL8 on the Fly)
H
H
H
BA RFU
BA RFU
BA RFU
V
L
L
L
L
V, CA
V, CA
V, CA
7
7
7
WRS4
WRS8
L
L
H
WRITE w/ Auto Precharge
(Fixed BL8 or BC4)
WRAP
H
H
H
H
H
H
L
L
L
H
H
H
L
L
L
L
L
L
BA RFU
BA RFU
BA RFU
V
L
H
H
H
V, CA
V, CA
V, CA
7
7
7
WRITE w/ Auto Precharge
(BC4 On the Fly)
WRAPS4
WRAPS8
WRITE w/ Auto Precharge
(BL8 On the Fly)
H
READ (Fixed BL8 or BC4)
READ (BC4, on the Fly)
READ (BL8, on the Fly)
RD
H
H
H
H
H
H
L
L
L
H
H
H
L
L
L
H
H
H
BA RFU
BA RFU
BA RFU
V
L
L
L
L
V, CA
V, CA
V, CA
7
7
7
RDS4
RDS8
H
Table continues with notes next page.
EMD3D256M08BS1/16BS1 Revision 1.3 10/2018
Copyright © 2018 Everspin Technologies
21
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