WE512K8, WE256K8,
WE128K8-XCX
White Electronic Designs
FIGURE 10 – SOFTWARE BLOCK DATA PROTECTION ENABLE ALGORITHM
(1)
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA A0
TO
ADDRESS 5555
WRITES ENABLED(2)
LOAD DATA XX
TO
ANY ADDRESS(4)
LOAD LAST BYTE
TO
ENTER DATA
PROTECT STATE
LAST ADDRESS
NOTES:
1. Data Format: I/O7-0 (Hex);
Address Format: A14 -A0 (Hex).
A17 and A18 control selection of one of four blocks in the 512Kx8.
A15, A16, and A17 control selection of one of 8 pages in the 256Kx8.
A15 and A16 control one of the four blocks in the 128Kx8.
2. Write Protect state will be activated at end of write 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. 1 to 128 bytes of data at each of 4 blocks may be loaded in the 512Kx8. 1 to 64 bytes of data
at each of 8 blocks may be loaded in the 256Kx8 and 1 to 64 bytes on 4 blocks in the 128Kx8.
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
May 2000
Rev. 1
10
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
WEDC [ WHITE ELECTRONIC DESIGNS CORPORATION ]
