AT29LV020_08 Datasheet, PDF (10/16 Pages) ATMEL Corporation – 2-megabit (256K x 8) 3-volt Only Flash Memory

16. Program Cycle Characteristics
Symbol
t_WC
t_AS
t_AH
t_DS
t_DH
t_WP
t_BLC
t_WPH
Parameter
Write Cycle Time
Address Set-up Time
Address Hold Time
Data Set-up Time
Data Hold Time
Write Pulse Width
Byte Load Cycle Time
Write Pulse Width High
17. Software Protected Program Waveform
Min
Max
Units
20
ms
10
ns
100
ns
100
ns
10
ns
200
ns
150
µs
200
ns
Byte 0
Byte 254 Byte 255
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 are both low.
3. All bytes that are not loaded within the sector being programmed will be indeterminate.
18. Programming Algorithm⁽¹⁾
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA A0
TO
ADDRESS 5555
WRITES ENABLED
LOAD DATA
TO
SECTOR (256 BYTES)⁽³⁾
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.
10 AT29LV020
0565E–FLASH–9/08