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I-jp

e-mail: info@flexputer.de

29/07/02 10:43

First we need a Instruction Pointer (IP) that is to be modified by the
jump instruction. Letís use Register 15 (0x0f) as the IP and set the
initial value to 0xFFFFFFFC.

Define   IP   0x0f
Register IP = 0xfffffffe


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.

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
 


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.


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
 

  See my Flexputer executing the first jump instruction