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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 the Operation Code of the jump instruction to be 0xf0.
The jump is relative to the IP that follows the jump instruction.
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LUT 0xf0
Code JSel=0 Fetch=0 Alu=ADD DstY=MEM_ADDR SrcB=IDV SrcA=MEM_ADDR
Code JSel=1 Fetch=1 Alu=Wait DstY=0 SrcB=0 SrcA=0
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I-jp
