EMD3D256M08BS1
EMD3D256M16BS1
Command Truth Table (Continued)
CKE
BA
[2:0]
A13- A12/ A10/ A0-A9,
Notes
Symbol
CS
RAS
CAS
WE
Function
A15
BC
AP
A11
Prev.
Next
READ with Auto Precharge
(Fixed BL8 or BC4)
RDAP
H
H
L
H
L
H
BA RFU
BA RFU
BA RFU
V
H
V, CA
7
7
READ with Auto Precharge
(BC4, on the Fly)
RDAPS4
H
H
L
H
L
H
L
H
V, CA
READ (BL8, on the Fly)
No Operation
RDAPS8
NOP
H
H
H
H
H
H
L
L
H
H
L
H
H
H
V
X
H
V
X
V, CA
7
8
9
H
V
X
V
X
V
X
Device Deselected
DES
H
L
X
H
V
H
V
X
H
V
H
V
X
H
V
H
V
Power Down Entry
PDE
PDX
H
L
L
V
V
V
V
V
V
V
V
V
V
H
L
Power Down Exit
H
6
H
ZQ Calibration Long
ZQCL
ZQCS
H
H
H
H
L
L
H
H
H
H
L
L
X
X
X
X
X
X
H
L
X
X
10
ZQ Calibration Short
Notes:
1. Commands are defined by states of CS, RAS, CAS, WE, and CKE at the rising edge of the clock. The MSB of BA, RA, and CA
are device-, density-, and configuration-dependent.
2. RESET is LOW enabled and used only for asynchronous reset. Thus, RESET must be held HIGH during any normal opera-
tion.
3. The state of ODT does not affect the states described in this table.
4. Operations apply to the bank defined by the bank address, BA[2:0]. For MRS, BA selects one of four mode registers.
5. “V” means “H” or “L” (a defined logic level), and “X” means “Don’t Care.”
6. See the CKE Truth Table below for additional information on CKE transition.
7. Burst READ’s or WRITE’s cannot be terminated or interrupted. MRS (fixed) and OTF BL/BC are defined in MR0.
8. The purpose of the NOP command is to prevent the MRAM from registering any unwanted commands. A NOP will not termi-
nate an operation that is executing.
9. The DES and NOP commands perform similarly.
10. ZQ CALIBRATION LONG is used for either ZQinit (first ZQCL command during initialization) or ZQoper (ZQCL command
after initialization).
EMD3D256M08BS1/16BS1 Revision 1.3 10/2018
Copyright © 2018 Everspin Technologies
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