* SPICE netlist
V1 sel0_control 0 PWL file=sel0.txt
V2 sel1_control 0 PWL file=sel1.txt
B1 en0_control 0 V=1-V(sel0_control)
B2 en1_control 0 V=1-V(sel1_control)
B3 en_hi_control 0 V=V(en0_control)*V(en1_control)
M1 data_in_b sel0_control 0 0 NMOS l=45n w=1.0u
M2 N002 sel1_control data_in_b data_in_b NMOS l=45n w=1.0u
V3 N002 0 0.375
M3 N001 en_hi_control data_in_b N001 PMOS l=45n w=1.0u
V4 N001 0 0.75
V5 sel0_control2 0 PWL file=sel2.txt
V6 sel1_control2 0 PWL file=sel3.txt
B4 en0_control2 0 V=1-V(sel0_control2)
B5 en1_control2 0 V=1-V(sel1_control2)
B6 en_hi_control2 0 V=V(en0_control2)*V(en1_control2)
M4 data_in_a sel0_control2 0 0 NMOS l=45n w=1.0u
M5 N004 sel1_control2 data_in_a data_in_a NMOS l=45n w=1.0u
V7 N004 0 0.375
M6 N003 en_hi_control2 data_in_a N003 PMOS l=45n w=1.0u
V8 N003 0 0.75

* LTspice schematic (.asc)
Version 4
SHEET 1 944 1952
WIRE 424 -688 280 -688
WIRE -120 -656 -264 -656
WIRE 424 -656 424 -688
WIRE -264 -592 -264 -656
WIRE 280 -512 280 -688
WIRE 312 -512 280 -512
WIRE 280 -496 280 -512
WIRE -120 -480 -120 -656
WIRE 184 -480 72 -480
WIRE 72 -448 72 -480
WIRE 312 -448 312 -512
WIRE 312 -448 280 -448
WIRE -72 -432 -120 -432
WIRE 184 -416 184 -480
WIRE 232 -416 184 -416
WIRE -168 -400 -472 -400
WIRE -72 -384 -72 -432
WIRE -72 -384 -120 -384
WIRE -472 -336 -472 -400
WIRE -120 -320 -120 -384
WIRE 232 -320 -120 -320
WIRE 280 -320 280 -400
WIRE 280 -320 232 -320
WIRE -120 -272 -120 -320
WIRE -72 -224 -120 -224
WIRE -168 -192 -472 -192
WIRE -72 -176 -72 -224
WIRE -72 -176 -120 -176
WIRE -472 -144 -472 -192
WIRE -120 -128 -120 -176
WIRE 472 352 328 352
WIRE -72 384 -216 384
WIRE 472 384 472 352
WIRE -216 448 -216 384
WIRE 328 528 328 352
WIRE 360 528 328 528
WIRE 328 544 328 528
WIRE -72 560 -72 384
WIRE 232 560 120 560
WIRE 120 592 120 560
WIRE 360 592 360 528
WIRE 360 592 328 592
WIRE -24 608 -72 608
WIRE 232 624 232 560
WIRE 280 624 232 624
WIRE -120 640 -424 640
WIRE -24 656 -24 608
WIRE -24 656 -72 656
WIRE -424 704 -424 640
WIRE -72 720 -72 656
WIRE 264 720 -72 720
WIRE 328 720 328 640
WIRE 328 720 264 720
WIRE -72 768 -72 720
WIRE -24 816 -72 816
WIRE -120 848 -424 848
WIRE -24 864 -24 816
WIRE -24 864 -72 864
WIRE -424 896 -424 848
WIRE -72 912 -72 864
FLAG -472 -144 sel0_control
FLAG -472 -256 0
FLAG -472 -64 0
FLAG -472 -336 sel1_control
FLAG 104 -880 0
FLAG 104 -960 en0_control
FLAG 392 -880 0
FLAG 392 -960 en1_control
FLAG 72 -448 en_hi_control
FLAG 72 -368 0
FLAG -120 -128 0
FLAG -264 -512 0
FLAG 424 -576 0
FLAG -424 896 sel0_control2
FLAG -424 784 0
FLAG -424 976 0
FLAG -424 704 sel1_control2
FLAG 152 160 0
FLAG 152 80 en0_control2
FLAG 440 160 0
FLAG 440 80 en1_control2
FLAG 120 592 en_hi_control2
FLAG 120 672 0
FLAG -72 912 0
FLAG -216 528 0
FLAG 472 464 0
FLAG 264 720 data_in_a
FLAG 232 -320 data_in_b
SYMBOL voltage -472 -160 R0
SYMATTR Value PWL file=sel0.txt
SYMATTR InstName V1
SYMBOL voltage -472 -352 M0
SYMATTR Value PWL file=sel1.txt
SYMATTR InstName V2
SYMBOL bv 104 -976 R0
SYMATTR InstName B1
SYMATTR Value V=1-V(sel0_control)
SYMBOL bv 392 -976 R0
SYMATTR InstName B2
SYMATTR Value V=1-V(sel1_control)
SYMBOL bv 72 -464 R0
SYMATTR InstName B3
SYMATTR Value V=V(en0_control)*V(en1_control)
SYMBOL nmos4 -168 -272 R0
SYMATTR InstName M1
SYMATTR Value2 l=45n w=1.0u
SYMBOL nmos4 -168 -480 R0
SYMATTR InstName M2
SYMATTR Value2 l=45n w=1.0u
SYMBOL voltage -264 -608 R0
SYMATTR InstName V3
SYMATTR Value 0.375
SYMBOL pmos4 232 -496 R0
SYMATTR InstName M3
SYMATTR Value2 l=45n w=1.0u
SYMBOL voltage 424 -672 R0
SYMATTR InstName V4
SYMATTR Value 0.75
SYMBOL voltage -424 880 R0
SYMATTR Value PWL file=sel2.txt
SYMATTR InstName V5
SYMBOL voltage -424 688 M0
SYMATTR Value PWL file=sel3.txt
SYMATTR InstName V6
SYMBOL bv 152 64 R0
SYMATTR InstName B4
SYMATTR Value V=1-V(sel0_control2)
SYMBOL bv 440 64 R0
SYMATTR InstName B5
SYMATTR Value V=1-V(sel1_control2)
SYMBOL bv 120 576 R0
SYMATTR InstName B6
SYMATTR Value V=V(en0_control2)*V(en1_control2)
SYMBOL nmos4 -120 768 R0
SYMATTR InstName M4
SYMATTR Value2 l=45n w=1.0u
SYMBOL nmos4 -120 560 R0
SYMATTR InstName M5
SYMATTR Value2 l=45n w=1.0u
SYMBOL voltage -216 432 R0
SYMATTR InstName V7
SYMATTR Value 0.375
SYMBOL pmos4 280 544 R0
SYMATTR InstName M6
SYMATTR Value2 l=45n w=1.0u
SYMBOL voltage 472 368 R0
SYMATTR InstName V8
SYMATTR Value 0.75