ꢓꢔꢐꢕꢖꢗꢘꢑꢑ
&
ꢛꢂꢏꢄꢌꢈꢅꢍꢆꢉꢑꢁꢒꢏꢕ
Mode
A0
L
A1
L
A6
L
A9
DQ
CE
L
OE
L
WE
RESET
H
ID read MFR code
ID read device code
Read
H
V
Code
Code
ID
L
L
H
H
L
L
V
H
ID
L
L
H
X
A0
X
A1
X
A6
X
A9
X
H
D
OUT
Standby
H
L
X
H
H
H
High Z
High Z
Output disable
Write
H
X
X
X
X
H
L
L
A0
L
A1
H
A6
L
A9
H
D
IN
Enable sector protect
Sector unprotect
L
V
Pulse/ L
Pulse/ L
V
H
X
X
ID
ID
L
V
L
H
H
V
H
ID
ID
Temporary sector
unprotect
X
X
X
X
X
X
X
V
X
ID
†
Verify sector protect
Verify sector unprotect
Hardware Reset
L
L
X
L
L
X
H
H
X
L
L
X
H
H
X
L
H
X
V
H
Code
ID
†
V
H
L
Code
ID
X
High Z
L = Low (<V ) = logic 0; H = High (>V ) = logic 1; V = 10.0 ± 1.0V; X = don’t care.
IL
IH
ID
In ×16 mode, BYTE = V . In ×8 mode, BYTE = V with DQ8-DQ14 in high Z and DQ15 = A-1.
IH
IL
†
Verification of sector protect/ unprotect during A9 = V
ID.
ꢜꢁꢒꢏꢉꢒꢏꢝꢅꢍꢅꢈꢅꢁꢍꢕ
Item
Description
Selected by A9 = V (9.5V–10.5V), CE = OE = A1 = A6 = L, enabling outputs.
ID
ID MFR code,
device code
When A0 is low (V ) the output data = 52h, a unique Mfr. code for Alliance Semiconductor Flash products.
IL
When A0 is high (V ), D
represents the device code for the AS29LV400.
IH
OUT
Selected with CE = OE = L, WE = H. Data is valid in t
time after addresses are stable, t after CE is low
CE
ACC
Read mode
Standby
and t after OE is low.
OE
Selected with CE = H. Part is powered down, and I reduced to <1.0 µA when CE = V ± 0.3V = RESET.
CC
CC
If activated during an automated on-chip algorithm, the device completes the operation before entering
standby.
Output disable Part remains powered up; but outputs disabled with OE pulled high.
Selected with CE = WE = L, OE = H. Accomplish all Flash erasure and programming through the command
register. Contents of command register serve as inputs to the internal state machine. Address latching occurs
on the falling edge of WE or CE, whichever occurs later. Data latching occurs on the rising edge WE or CE,
Write
whichever occurs first. Filters on WE prevent spurious noise events from appearing as write commands.
Hardware protection circuitry implemented with external programming equipment causes the device to
disable program and erase operations for specified sectors. For in-system sector protection, refer to Sector
protect algorithm on page 12.
Enable
sector protect
Disables sector protection for all sectors using external programming equipment. All sectors must be
protected prior to sector unprotection. For in-system sector unprotection, refer to Sector unprotect
algorithm on page 12.
Sector
unprotect
Verifies write protection for sector. Sectors are protected from program/ erase operations on commercial
programming equipment. Determine if sector protection exists in a system by writing the ID read command
sequence and reading location XXX02h, where address bits A12–17 select the defined sector addresses. A
logical 1 on DQ0 indicates a protected sector; a logical 0 indicates an unprotected sector.
Verify sector
protect/
unprotect
Temporarily disables sector protection for in-system data changes to protected sectors. Apply +10V to RESET
to activate temporary sector unprotect mode. During temporary sector unprotect mode, program protected
sectors by selecting the appropriate sector address. All protected sectors revert to protected state on removal
of +10V from RESET.
Temporary
sector
unprotect
8/ 9/ 01; V.0.9.9.1
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