count_deng.map.eqn

用VHDL语言实现8421码的十进制计数器

--q[0] is q[0]
q[0]_reg_input = VCC;
q[0] = TFFE(q[0]_reg_input, GLOBAL(clk), GLOBAL(clr), , );


--q[1] is q[1]
q[1]_p1_out = q[3] & !q[2] & !q[1];
q[1]_or_out = q[1]_p1_out # !q[0];
q[1]_reg_input = !q[1]_or_out;
q[1] = TFFE(q[1]_reg_input, GLOBAL(clk), GLOBAL(clr), , );


--q[2] is q[2]
q[2]_p1_out = q[1] & q[0];
q[2]_or_out = q[2]_p1_out;
q[2]_reg_input = q[2]_or_out;
q[2] = TFFE(q[2]_reg_input, GLOBAL(clk), GLOBAL(clr), , );


--q[3] is q[3]
q[3]_p1_out = !q[3] & !q[2];
q[3]_p2_out = q[2] & !q[1];
q[3]_p3_out = !q[2] & q[1];
q[3]_or_out = q[3]_p1_out # q[3]_p2_out # q[3]_p3_out # !q[0];
q[3]_reg_input = !q[3]_or_out;
q[3] = TFFE(q[3]_reg_input, GLOBAL(clk), GLOBAL(clr), , );


--~GND~0 is ~GND~0
~GND~0_or_out = GND;
~GND~0 = ~GND~0_or_out;


--clk is clk
--operation mode is input

clk = INPUT();


--clr is clr
--operation mode is input

clr = INPUT();


--oc is oc
--operation mode is output

oc = OUTPUT(~GND~0);


--y[0] is y[0]
--operation mode is output

y[0] = OUTPUT(q[0]);


--y[1] is y[1]
--operation mode is output

y[1] = OUTPUT(q[1]);


--y[2] is y[2]
--operation mode is output

y[2] = OUTPUT(q[2]);


--y[3] is y[3]
--operation mode is output

y[3] = OUTPUT(q[3]);