Jum-And-Link (Mips)
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Jum-And-Link (Mips)

 
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Paminu
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Posted: Thu Aug 25, 2005 4:15 pm    Post subject: Jum-And-Link (Mips) Reply with quote
I am drawing a diagram of a singlecycle CPU architecture. I am trying to
draw JAL (Jump-And-Link) which is defined as:

R[31] = PC+4
PC = JumpAddr

I have drawn the Jump instruction so its just:

R[31] = PC+4 that I am missing.

I have made a Register that has a "Write register" and "Write Data" input.
When I want to do JAL I just drive 31 to the "Write Register" input but I
guess "Write Data" (the value) has to be PC+4.

Do I just take PC+4 and put into the "Write Data" input?

Where can I find some more info/diagrams on this instruction?
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Guest
Posted: Fri Aug 26, 2005 12:15 am    Post subject: Re: Jum-And-Link (Mips) Reply with quote
The front end of the decoder has already computed the PC+4, so all you
have to do is pipeline this value to the end of the ALU and miltiplex
it onto the result bus, while you multiplex the R31 onto the register
file write decoder port.
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