9
AT29LV020
0565C–FLASH–05/02
Software Protected Program Waveform
Notes: 1. A8 through A17 must specify the sector address during each high to low transition of WE (or CE) after the software code has
been entered.
2. OE
must be high when WE and CE arebothlow.
3. All words that are not loaded within the sector being programmed will be indeterminate.
Programming Algorithm
(1)
Program Cycle Characteristics
Symbol Parameter Min Max Units
t
WC
WriteCycleTime 20 ms
t
AS
Address Set-up Time 10 ns
t
AH
Address Hold Time 100 ns
t
DS
Data Set-up Time 100 ns
t
DH
Data Hold Time 10 ns
t
WP
Write Pulse Width 200 ns
t
BLC
Byte Load Cycle Time 150 µs
t
WPH
Write Pulse Width High 200 ns
Notes: 1. Data Format: I/O7 - I/O0 (Hex);
Address Format: A14 - A0 (Hex).
2. Data Protect state will be re-activated at end of
program cycle.
3. 256 bytes of data MUST BE loaded.
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA A0
TO
ADDRESS 5555
LOAD DATA
TO
SECTOR (256 BYTES)
(3)
WRITES ENABLED
ENTER DATA
PROTECT STATE
(2)
