Flash Control (78H) - Intel NetStructure ZT 5504 Manual

Flash Control (78h)

I/O Address: 78h
Default Value: 0x00
Size: 8 bits
Attribute: R/W
Note: This register is reset to 00h on init or reset. The BIOS resides in page 000.
Bit Description
7 Flash Write Protection
Controls Write Enable to flash:
0 = Write protects flash.
1 = Allows writes to flash.
Flash memory is discussed in
6
BIOS Recovery Module Access Override
Controls flash access to the BIOS Recovery Module. The
Module is discussed in Chapter 8.
0 = Allows access to the BIOS Recovery Module.
1 = Disallows access to the BIOS Recovery Module, reset/cpuinit to 0.
5:3 RESERVED
2 Page 2
Flash A21 (512 KB page)
1 Page 1
Flash A20 (512 KB page)
0 Page 0
Flash A19 (512 KB page)
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Chapter 8 BIOS Recovery.
C. System Registers
Default
BIOS Recovery
0
0
0
0
0
0
70