************************************************************************
*** Lab 3, student submission sequence
*** Part A: Framework.
************************************************************************

.include "6004lib/nominal.jsim"
.include "6004lib/stdcell.jsim"
.include "6004lib/lab3_test_bool.jsim"
.include "lib.jsim"
.options plugh2536038 // Magic option to make jsim report checksum

.subckt BOOL alufn[3:0] A[31:0] B[31:0] OUT[31:0]
xdummy OUT[31:0] constant0
.ends

.subckt ARITH alufn[1:0] A[31:0] B[31:0] OUT[31:0] Z V N
xdummy OUT[31:0] Z V N constant0
.ends

.subckt SHIFT alufn[1:0] A[31:0] B[31:0] OUT[31:0]
xdummy OUT[31:0] constant0
.ends

.subckt CMP alufn3 alufn1 Z V N OUT[31:0]
xdummy OUT[31:0] constant0
.ends

.subckt alu alufn[4:0] a[31:0] b[31:0] out[31:0] z v n

*** Generate outputs from each of BOOL, SHIFT, ARITH, CMP subcircuits:
xbool alufn[3:0] a[31:0] b[31:0] boolout[31:0] BOOL
xshift alufn[1:0] a[31:0] b[31:0] shiftout[31:0] SHIFT
xarith alufn[1:0] a[31:0] b[31:0] arithout[31:0] z v n ARITH
xcmp alufn[3] alufn[1] z v n cmpout[31:0] CMP

*** Combine them, using three multiplexors:
xmux1 alufn[4]#32 nonbool[31:0] boolout[31:0] out[31:0] mux2
xmux2 alufn[2]#32 arithshift[31:0] cmpout[31:0] nonbool[31:0] mux2
xmux3 alufn[3]#32 arithout[31:0] shiftout[31:0] arithshift[31:0] mux2

.ends