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First we need a Instruction Pointer (IP) that is to be modified by the
jump instruction. Let’s use Register 15 (0x0f) as the IP and set the
initial value to 0xFFFFFFFC.
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Define IP 0x0f
Register IP = 0xfffffffe |
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At power up we load Register 0x0f (IP) to the External Memory Unit
and wait for the first instruction to arrive at the input of the LUT.
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LUT 0
Code JSel=0 Fetch=0 Alu=SEL_A DstY=MEM_ADDR SrcB=0 SrcA=IP
Code JSel=1 Fetch=1 Alu=Wait DstY=0 SrcB=0 SrcA=0
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Now we define 3 Registers to serve as evaluation stack and set some
initial values to see the and working in the simulation
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Define RegA 0x01
Register RegA = 0xAA
Define RegB 0x02
Register RegB = 0xF5
Define RegC 0x03 |
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As OpCode I used 0x46
- first we do the AND operation and tell the EMU to read the next
instruction.
- then we move register C to register B
- finally we wait for the next instruction
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LUT 0x46
Code JSel=0 Fetch=1 Alu=AND DstY=RegA SrcB=RegB SrcA=RegA
Code JSel=0 Fetch=0 Alu=SELA DstY=RegB SrcB=0 SrcA=RegC
Code JSel=1 Fetch=0 Alu=Wait DstY=0 SrcB=0 SrcA=0
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I-and
