ngspice/examples/digital/digital_devices/encoder.cir

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Interface 74147 encoder with 74145 decoder
* ----------------------------------------------------------- 74145 ------
* BCD-To-Decimal Decoders/Drivers
*
* The TTL Logic Data Book, 1988, TI Pages 2-447 to 2-449
* bss 3/17/94
*
.SUBCKT 74145 A B C D O0 O1 O2 O3 O4 O5 O6 O7 O8 O9
+ optional: DPWR=$G_DPWR DGND=$G_DGND
+ params: MNTYMXDLY=0 IO_LEVEL=0
U1LOG LOGICEXP(4,10) DPWR DGND
+ A B C D
+ O0_O O1_O O2_O O3_O O4_O O5_O O6_O O7_O O8_O O9_O
+ D0_GATE IO_STD MNTYMXDLY={MNTYMXDLY} IO_LEVEL={IO_LEVEL}
+
+ LOGIC:
+ abar = {~A}
+ bbar = {~B}
+ cbar = {~C}
+ dbar = {~D}
+ O0_O = {~(abar & bbar & cbar & dbar)}
+ O1_O = {~(A & bbar & cbar & dbar)}
+ O2_O = {~(abar & B & cbar & dbar)}
+ O3_O = {~(A & B & cbar & dbar)}
+ O4_O = {~(abar & bbar & C & dbar)}
+ O5_O = {~(A & bbar & C & dbar)}
+ O6_O = {~(abar & B & C & dbar)}
+ O7_O = {~(A & B & C & dbar)}
+ O8_O = {~(abar & bbar & cbar & D)}
+ O9_O = {~(A & bbar & cbar & D)}
U2DLY PINDLY(10,0,0) DPWR DGND
+ O0_O O1_O O2_O O3_O O4_O O5_O O6_O O7_O O8_O O9_O
+ O0 O1 O2 O3 O4 O5 O6 O7 O8 O9
+ IO_STD MNTYMXDLY={MNTYMXDLY} IO_LEVEL={IO_LEVEL}
+
+ PINDLY:
+ O0 O1 O2 O3 O4 O5 O6 O7 O8 O9 = {
+ CASE(
+ DELAY(-1,-1,50ns))}
.ENDS 74145
*
* ----------------------------------------------------------- 74147 ------
* 10-Line To 4-Line Priority Encoders
*
* The TTL Logic Data Book, 1988, TI Pages 2-451 to 2-456
* bss 3/18/94
*
.SUBCKT 74147 I1 I2 I3 I4 I5 I6 I7 I8 I9 A B C D
+ optional: DPWR=$G_DPWR DGND=$G_DGND
+ params: MNTYMXDLY=0 IO_LEVEL=0
U1LOG LOGICEXP(9,4) DPWR DGND
+ I1 I2 I3 I4 I5 I6 I7 I8 I9
+ A_O B_O C_O D_O
+ D0_GATE IO_STD MNTYMXDLY={MNTYMXDLY} IO_LEVEL={IO_LEVEL}
+
+ LOGIC:
+ i1bar = {~I1}
+ i2bar = {~I2}
+ i3bar = {~I3}
+ i4bar = {~I4}
+ i5bar = {~I5}
+ i6bar = {~I6}
+ i7bar = {~I7}
+ i8bar = {~I8}
+ i9bar = {~I9}
+ nor89 = {~(i8bar | i9bar)}
+ A_O = {~((i1bar & I2 & I4 & I6 & nor89) | (i3bar & I4 & I6 & nor89) | (i5bar & I6 & nor89) |
+ (i7bar & nor89) | i9bar)}
+ B_O = {~((i2bar & I4 & I5 & nor89) | (i3bar & I4 & I5 & nor89) | (i6bar & nor89) |
+ (i7bar & nor89))}
+ C_O = {~((i4bar & nor89) | (i5bar & nor89) | (i6bar & nor89) | (i7bar & nor89))}
+ D_O = {~(i8bar | i9bar)}
U2DLY PINDLY(4,0,9) DPWR DGND
+ A_O B_O C_O D_O
+ I1 I2 I3 I4 I5 I6 I7 I8 I9
+ A B C D
+ IO_STD MNTYMXDLY={MNTYMXDLY} IO_LEVEL={IO_LEVEL}
+
+ BOOLEAN:
+ IN1 = {CHANGED(I1,0) & I2=='1 & I3=='1 & I4=='1 & I5=='1 & I6=='1 & I7=='1 & I8=='1 &
+ I9=='1}
+ IN2 = {CHANGED(I2,0) & I1=='1 & I3=='1 & I4=='1 & I5=='1 & I6=='1 & I7=='1 & I8=='1 &
+ I9=='1}
+ IN3 = {CHANGED(I3,0) & I1=='1 & I2=='1 & I4=='1 & I5=='1 & I6=='1 & I7=='1 & I8=='1 &
+ I9=='1}
+ IN4 = {CHANGED(I4,0) & I1=='1 & I2=='1 & I3=='1 & I5=='1 & I6=='1 & I7=='1 & I8=='1 &
+ I9=='1}
+ IN5 = {CHANGED(I5,0) & I1=='1 & I2=='1 & I3=='1 & I4=='1 & I6=='1 & I7=='1 & I8=='1 &
+ I9=='1}
+ IN6 = {CHANGED(I6,0) & I1=='1 & I2=='1 & I3=='1 & I4=='1 & I5=='1 & I7=='1 & I8=='1 &
+ I9=='1}
+ IN7 = {CHANGED(I7,0) & I1=='1 & I2=='1 & I3=='1 & I4=='1 & I5=='1 & I6=='1 & I8=='1 &
+ I9=='1}
+ IN8 = {CHANGED(I8,0) & I1=='1 & I2=='1 & I3=='1 & I4=='1 & I5=='1 & I6=='1 & I7=='1 &
+ I9=='1}
+ IN9 = {CHANGED(I9,0) & I1=='1 & I2=='1 & I3=='1 & I4=='1 & I5=='1 & I6=='1 & I7=='1 &
+ I8=='1}
+ IN = {IN1 | IN2 | IN3 | IN4 | IN5 | IN6 | IN7 | IN8 | IN9}
+
+ PINDLY:
+ A B C = {
+ CASE(
+ IN & TRN_LH, DELAY(-1,9ns,14ns),
+ IN & TRN_HL, DELAY(-1,7ns,11ns),
+ TRN_LH, DELAY(-1,13ns,19ns),
+ TRN_HL, DELAY(-1,12ns,19ns),
+ DELAY(-1,14ns,20ns))}
+
+ D = {
+ CASE(
+ (IN8 | IN9) & TRN_LH, DELAY(-1,9ns,14ns),
+ (IN8 | IN9) & TRN_HL, DELAY(-1,7ns,11ns),
+ TRN_LH, DELAY(-1,13ns,19ns),
+ TRN_HL, DELAY(-1,12ns,19ns),
+ DELAY(-1,14ns,20ns))}
.ENDS 74147
*
* .SUBCKT 74147 I1 I2 I3 I4 I5 I6 I7 I8 I9 A B C D
X1 i1 i2 i3 i4 i5 i6 i7 i8 i9 a b c d 74147
* .SUBCKT 74145 A B C D O0 O1 O2 O3 O4 O5 O6 O7 O8 O9
X2 a_i b_i c_i d_i O0 O1 O2 O3 O4 O5 O6 O7 O8 O9 74145
a_1 a a_i d_inv_0
a_2 b b_i d_inv_0
a_3 c c_i d_inv_0
a_4 d d_i d_inv_0
.model d_inv_0 d_inverter(inertial_delay=true)
a1 [i1 i2 i3 i4 i5 i6 i7 i8 i9] input_vec1
.model input_vec1 d_source(input_file = "encoder.stim")
.TRAN 4e-008 2U 0
.save all
.control
listing
run
eprint i1 i2 i3 i4 i5 i6 i7 i8 i9
eprint d c b a
eprint o0 o1 o2 o3 o4 o5 o6 o7 o8 o9
* save data to input directory
cd $inputdir
eprvcd i1 i2 i3 i4 i5 i6 i7 i8 i9 a b c d o0 o1 o2 o3 o4 o5 o6 o7 o8 o9 > encoder.vcd
* plotting the vcd file with GTKWave
if $oscompiled = 1 | $oscompiled = 8 ; MS Windows
shell start gtkwave encoder.vcd --script nggtk.tcl
else
shell gtkwave encoder.vcd --script nggtk.tcl &
end
quit
.endc
.END