March 2001
AS29LV800
®
Operating modes
Mode
CE
L
OE
L
WE
A0
L
A1
A6
L
A9
VID
VID
A9
X
RESET
H
DQ
ID read MFR code
ID read device code
Read
H
L
Code
Code
DOUT
High Z
High Z
DIN
L
L
H
H
A0
X
L
L
H
L
L
H
A1
X
A6
X
H
Standby
H
L
X
X
H
Output disable
Write
H
H
X
X
X
X
H
L
H
L
A0
L
A1
H
H
A6
L
A9
VID
VID
H
Enable sector protect
Sector unprotect
L
VID
VID
Pulse/L
Pulse/L
H
X
L
L
H
H
X
Temporary sector
unprotect
X
X
X
X
X
X
X
VID
X
Verify sector protect†
Verify sector unprotect†
Hardware Reset
L
L
X
L
L
X
H
H
X
L
L
X
H
H
X
L
VID
VID
X
H
H
L
Code
H
X
Code
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.
Mode definitions
Item
Description
Selected by A9 = VID(9.5V–10.5V), CE = OE = A1 = A6 = L, enabling outputs.
When A0 is low (VIL) the output data = 52h, a unique Mfr. code for Alliance Semiconductor Flash products.
When A0 is high (VIH), DOUT represents the device code for the AS29LV800.
ID MFR code,
device code
Selected with CE = OE = L, WE = H. Data is valid in tACC time after addresses are stable, tCE after CE is low
and tOE after OE is low.
Read mode
Standby
Selected with CE = H. Part is powered down, and ICC reduced to <1.0 µA when CE = VCC 0.3V = 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 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 14.
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
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
Verify sector
protect/
sequence and reading location XXX02h, where address bits A12–18 select the defined sector addresses. A
unprotect
logical 1 on DQ0 indicates a protected sector; a logical 0 indicates an unprotected sector.
3/22/01; V.1.0
Alliance Semiconductor
P. 3 of 25
ANADIGICS [ ANADIGICS, INC ]
