Software protected program waveform, Programming algorithm, Program cycle characteristics – Rainbow Electronics AT29LV256 User Manual
Page 7
AT29LV256
7
Software Protected Program Waveform
(1)(2)(3)
Notes:
1. OE must be high when WE and CE are both low.
2. A6 through A14 must specify the sector address during each high to low transition of WE (or CE) after the software code has
been entered.
3. All bytes 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
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
µ
s
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 (64 BYTES)
(3)
WRITES ENABLED
ENTER DATA
PROTECT STATE
(2)
Notes for software program code:
1.
Data Format: I/O7 - I/O0 (Hex);
Address Format: A14 - A0 (Hex).
2.
Data Protect state will be re-activated at end of pro-
gram cycle.
3.
64 bytes of data MUST BE loaded.