Generates 32-bit address (displacement) DISP32, adds
it with content of register Ra (64-bit) and then loads
it into AGU accumulator register. The register Ra is
accessed via Port 5, it's bank is selected via BS5.
Note: DISP32 must be always expressed as a pair SYMBOL
IMMEDIATE. More information on this in notations.
Takes 3 cycles to execute.
Example: AGU_ER ZERO 0x00000002 0xA5
DISP AGU P5
----------------
00000000 - A5
00000000 - 00
00000002 ER 00
NOT YET
AGU_ER ZERO 5 0x20
!! Generate 32-bit address
!! (5) add it with contents
!! of register 0x20 and load
!! it to AGU accumulator.