Bios Write Protect & Top Block Lock Setting: Jp2; Write Protect; Top Block Lock - Contec SPI-8550-LLVAS User Manual

4. Jumper Setting
BIOS Write Protect & Top Block Lock setting:
JP2

Write Protect:

When enabled, prevents programming or block erase to all but the highest addressable block (0-6 in a
4-Mbit, 0-14 in an 8-Mbit component), regardless of the state of the corresponding lock registers. When
disabled then hardware write protection for these blocks, though register-based protection still applies.

Top Block Lock:

When enabled, it prevents programming or block erase to the highest addressable block (7 in a 4-Mbit,
15 in an 8-Mbit component), regardless of the state of the lock register. When disabled, then hardware
write protection for the top block, though register-based protection still applies.
Table 4.3. Top Block Lock
JP2
2
1
3
4
5
6
2
1
3
4
5
6
1 2
3 Top Block Lock Disabled *
4
5
6
1 2
3
4
5
6
* Default: Disabled
34
Function
Write protect Disabled *
Write protect Enabled
Top Block Lock Enabled
SPI-8550-LLVAS