DMux16 for ALU?

[Killboy]

I'm working on the ALU and my guess is that I'm making things more complicated than they need to be .. does it make sense to have a DMux16 to switch between alternate paths?

thanks

E.g.

          Sel   
           |------------------|
in---[Dmux16]---- path_1 ----[Mux16]--- out
             \--- path_2 ---/

[cadet1620]

Killboy wrote

I'm working on the ALU and my guess is that I'm making things more complicated than they need to be .. does it make sense to have a DMux16 to switch between alternate paths?

thanks

E.g.

          Sel   
           |------------------|
in---[Dmux16]---- path_1 ----[Mux16]--- out
             \--- path_2 ---/

The Mux16 doesn't care what the value is at its unselected input, so you can directly connect in to both path 1 and path 2.

Since both paths are computed at the same time by the hardware, it doesn't slow things down. In fact, the Demux would add additional delay.

--Mark

[Killboy]

It was more about using the Dmux like a switch .. meaning that path_1 could pass 'in' through unchanged and path_2 could perform a Not or some other modification. The Mux was just so I only had one path attached to 'out'

Ah, I see what you're saying, perform the changes anyway then select between them