Program cycle characteristics, Software protected program waveform, Programming algorithm(1) – Rainbow Electronics AT29BV020 User Manual
Page 9: Programming algorithm
9
AT29BV020
0402D–FLASH–05/02
Software Protected Program Waveform
Notes:
1. OE must be high when WE and CE are both low.
2. 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.
3. Data in bytes not loaded within a sector being programmed may be altered by the program operation; therefore, all bytes
within a sector must be loaded.
Programming Algorithm
(1)
Program Cycle Characteristics
Symbol
Parameter
Min
Max
Units
t
WC
Write Cycle Time
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
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)
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.