User guide

2. Execute the RESET vector:

LDR PC, =0x0F000004

This causes a jump to the real address of the next ROM instruction. This assembles to a position-independent

instruction

LDR PC, [PC, offset]

3. Write to the REMAP register and set REMAP = 1.

4. Complete the rest of the initialization code as described in Initializing the system.

System decoder

ROM can be aliased to address 0x0 by the system memory decoder. A simple memory decoder might implement

this as:

case ADDR(31:24) is

when "0x00"

if REMAP = "0" then

select ROM

else

select SRAM

when "0x0F"

select ROM

when ....

Writing Code for ROM