User`s guide

B.1.7.3 Flash ROM Access

The ﬂash ROM can be viewed as two banks of 512KB each. At power-up

the lower 512KB bank is accessed using the address range 3 FFF8 0000 to

3 FFFF FFFF.

Setting address bit 19 will allow you to access the higher 512KB of ﬂash ROM.

Write a 1 to the register at address 800 to set address bit 19. Manually deposit

a 1 to address 1 C001 0000 or enter the following command from the debug

monitor:

> wb 800 1

The address range for the higher bank is 3 FFF8 0000 to 3 FFFF FFFF, the

same as for the lower bank. Access is now to the higher bank and will continue

until the AlphaPC64 is reset ora0iswritten to the register at address 800.

Note

The update-enable jumper must be installed from pin J16-2 to pin

J16-3 to enable writing to the ﬂash ROM. See connector J16 in

Table 2–3.

SROM Initialization B–15