EFST
7. FUNCTIONAL DESCRIPTION
7.1 Device operation
This section describes the requirements and use
of the device bus operations, which are initiated
through the internal command register. The
register is composed of latches that store the
command, address and data information needed
F49L040A
to execute the command. The contents of the
register serve as inputs to the internal state
machine. The state machine outputs dictate the
function of the device. The F49L040A features
various bus operations as Table 2.
Table 2. F49L040A Operation Modes Selection
ADDRESS
DESCRIPTION
CE
OE
WE
A18 A12
|
|
A13 A10
A9
A8
|
A7
AIN
AIN
X
X
A6
A5
|
A2
A1 A0
DQ0~DQ7
Read
Write
Output Disable
Standby
Sector Protect(2)
Sector Unprotect(2)
Auto-select
Notes:
L
L
L
H
L
L
L
H
H
X
H
H
H
L
H
X
L
L
SA
SA
X
X
V
ID
V
ID
Dout
DIN
High Z
High Z
L
H
X
X
H
H
L
L
DIN
DIN
X
X
See Table 3
1.
L= Logic Low = V
IL
, H= Logic High = V
IH
, X= Don't Care, SA= Sector Address, V
ID
=11.5V to 12.5V.
AIN= Address In, DIN = Data In, Dout = Data Out.
2. The sector protect and unprotect functions may also be implemented via programming equipment.
Table 3. F49L040A Auto-Select Mode (High Voltage Method)
ADDRESS
DQ0~DQ7
A3
L
H
H
L
X
X
A2
H
L
H
L
X
X
A1
L
L
L
L
L
H
A0
L
L
L
L
H
L
7FH
7FH
7FH
8CH
4FH
Code(2)
DESCRIPTION
CE
OE
WE
A18
|
A13
X
X
X
X
X
SA
A12
|
A10
X
X
X
X
X
X
A9
V
ID
V
ID
V
ID
V
ID
V
ID
V
ID
A8
|
A4
X
X
X
X
X
X
A6
X
X
X
X
X
L
L
(Manufacturer ID:EFST)
L
L
L
(Device ID: F49L040A)
Sector Protection Verify
L
L
L
L
L
L
L
L
H
H
H
H
H
H
Notes :
1.Manufacturer and device codes may also be accessed via the software command sequence in Table 4.
2. Code=00H means unprotected.
Code =01H means protected.
Elite Flash Storage Technology Inc.
Publication Date : Apr. 2005
Revision: 1.0
5/41
ESMT [ ELITE SEMICONDUCTOR MEMORY TECHNOLOGY INC. ]
