AS29LV800
October 2000
®
Operating modes
Mode
CE
L
OE
L
WE
A0
L
A1
A6
L
A9
RESET DQ
ID read MFR code
ID read device code
Read
H
L
V
V
H
H
H
H
H
H
H
H
Code
Code
ID
ID
L
L
H
H
L
L
L
L
H
A0
X
A1
X
A6
X
A9
X
D
OUT
Standby
H
L
X
H
H
X
High Z
High Z
Output disable
Write
H
X
X
X
X
L
L
A0
L
A1
H
A6
L
A9
D
X
X
IN
Enable sector protect
Sector unprotect
L
V
V
Pulse/L
Pulse/L
V
V
ID
ID
ID
ID
L
L
H
H
Temporary sector
unprotect
X
X
X
X
X
X
X
V
X
ID
†
Verify sector protect
L
L
X
L
L
X
H
H
X
L
L
X
H
H
X
L
V
V
X
H
H
L
Code
ID
ID
†
Verify sector unprotect
Hardware Reset
H
X
Code
High Z
L = Low (<VIL) = logic 0; H = High (>VIH) = logic 1; VID = 10.0 ± 1.0V; X = don’t care.
In ×16 mode, BYTE = VIH. In ×8 mode, BYTE = VIL with DQ8-DQ14 in high Z and DQ15 = A-1.
†Verification of sector protect/unprotect during A9 = VID.
Mode definitions
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
IL
products. When A0 is high (V ), D
represents the device code for the AS29LV800.
IH
OUT
Selected with CE = OE = L, WE = H. Data is valid in t
time after addresses are stable, t after CE is
CE
ACC
Read mode
Standby
low 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 =
CC
CC
RESET. 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
Write
latching occurs on the falling edge of WE or CE, whichever occurs later. Data latching occurs on the rising
edge WE or CE, 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 page14.
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 14.
Sector
unprotect
DID 11-40002-A. 10/19/00
ALLIANCE SEMICONDUCTOR
3
ANADIGICS [ ANADIGICS, INC ]
