Specifications

17 January 1997 – Subject to Change
SROM Initialization C–9
Flash ROM Access
C.8 Flash ROM Access
The flash ROM can be viewed as two banks of 512KB each. At power-up the lower
512KB bank is accessed by using the address range 86.FFF8.0000 to 86.FFFF.FFFF.
Setting address bit 19 (flash_adr19) allows you to access the higher 512KB of flash
ROM. Write a 1 to the register at address 0x800 to set address bit 19. Manually
deposit a 1 to address 0x800 or enter the following command from the debug
monitor:
> wb 800 1
The address range for the higher bank is 86.FFF8.0000 to 86.FFFF.FFFF, the same
as for the lower bank. Access is now to the higher bank and will continue until the
AlphaPC 164 is reset or a 0 is written to the register at address 0x800.
Note:
The write-enable jumper must be installed at J31—2/3 (see Figure 2-1
and Figure 2-2). This enables writing to the flash ROM.