ESMT
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
to execute the command. The contents of the
F49L800UA/F49L800BA
register serve as inputs to the internal state
machine. The state machine outputs dictate the
function of the device. The F49L800UA
/F49L800BA features various bus operations as
Table 3.
Table 3. F49L800UA/F49L800BA Operation Modes Selection
ADDRESS
DESCRIPTION
CE
OE
WE
RESET
A18 A11
DQ8~DQ15
A8
A5
DQ0~DQ7
BYTE
|
|
|
|
A9
A6
A1 A0
=V
IH
A12 A10
A7
A2
BYTE
=V
IL
High Z
DQ8~DQ14=
Reset(3)
Read
Write
Output Disable
Standby
Sector Protect(2)
Sector Unprotect(2)
Temporary sector unprotect
X
L
L
L
V
CC
±
0.3V
L
L
X
X
L
H
H
X
H
H
X
X
H
L
H
X
L
L
X
L, Vss±
0.3V(3)
H
H
H
V
CC
±
0.3V
V
ID
V
ID
V
ID
SA
SA
X
X
X
X
X
X
X
AIN
AIN
X
X
L
H
X
X
H
H
L
L
High Z
Dout
DIN
High Z
High Z
DIN
DIN
DIN
High Z
Dout
DIN
High Z
High Z
X
X
DIN
High Z
DQ15=A-1
High Z
High Z
X
X
High Z
AIN
See Table 4
Auto-select
Notes:
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.
3. See “Reset Mode” section.
Elite Semiconductor Memory Technology Inc.
Publication Date : May. 2007
Revision: 1.2
5/47
ESMT [ ELITE SEMICONDUCTOR MEMORY TECHNOLOGY INC. ]
