4 bit alu

[[email protected]]

can you tell me how to make a4 bit alu. i know that the fulladders
will be cascaded easley but i dont understand how to implement the
mux





thanks for helping.

 

[[email protected]]

can you tell me how to make a4 bit alu. i know that the fulladders
will be cascaded easley but i dont understand how to implement the
mux

thanks for helping.

Beats me, but look at how they did it back then

https://asocoamusement.com/datasheets/74LS_series/74LS181.pdf

 

[krw]

[email protected]>,
[email protected] says...>

can you tell me how to make a4 bit alu. i know that the fulladders
will be cascaded easley but i dont understand how to implement the
mux

With a multiplexor?

If S=1 then A <= X else A <= Y
or
A = (S AND X) or (/S AND Z)

Where: S = Input select (scalar)
X, Y = Inputs buses (vector)
A = Result bus (vector)

 

[krw]

[email protected]>,
[email protected] says...>

With a multiplexor?

If S=1 then A <= X else A <= Y
or
A = (S AND X) or (/S AND Z) ^ crap, make that a 'Y'

Where: S = Input select (scalar)
X, Y = Inputs buses (vector)
A = Result bus (vector)