Rainbow Electronics AT29C1024 - Manual (Page 8)

AT29C1024
8
Software Data Protection
Enable Algorithm
(1)
Notes for software program code:
1. Data Format: I/O15 - I/O0 (Hex);
Address Format: A14 - A0 (Hex).
2. Write Protect state will be activated at end of write
period even if no other data is loaded.
3. Write Protect state will be deactivated at end of
write period even if no other data is loaded.
4. 128 words of data MUST BE loaded.
Software Data Protection
Disable Algorithm
(1)
Software Protected Program Cycle Waveform
(1)(2)(3)
Note: 1. A7 through A16 must specify the same page 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.
LOAD DATA AAAA
TO
ADDRESS 5555
LOAD DATA 5555
TO
ADDRESS 2AAA
LOAD DATA A0A0
TO
ADDRESS 5555
LOAD DATA
TO
SECTOR (128 WORDS) (4)
WRITES ENABLED
ENTER DATA
PROTECT STATE (2)
LOAD DATA AAAA
TO
ADDRESS 5555
LOAD DATA 5555
TO
ADDRESS 2AAA
LOAD DATA 8080
TO
ADDRESS 5555
LOAD DATA AAAA
TO
ADDRESS 5555
LOAD DATA 5555
TO
ADDRESS 2AAA
LOAD DATA 2020
TO
ADDRESS 5555
LOAD DATA XXXX
TO
SECTOR (128 WORDS) (4)
EXIT DATA
PROTECT STATE (3)