example.py

@myhdl.block
def dct_2d(inputs, outputs, clock, reset, num_fractional_bits=14):

    first_1d_output = output_interface()

    first_1d = dct_1d(inputs, first_1d_output, clock,
                      reset, num_fractional_bits)

    inputs_2nd_stage = [input_1d_2nd_stage(first_1d_output.out_precision)
                        for _ in range(8)]

    outputs_2nd_stage = [output_interface() for _ in range(8)]

    stage_2_insts = [dct_1d(inputs_2nd_stage[i], outputs_2nd_stage[i], clock, reset,
                            num_fractional_bits) for i in range(8)]
    @always_comb
    def first_stage_to_second():
        if first_1d_output.data_valid:
            inputs_2nd_stage[0].data_in.next = first_1d_output.out0
            inputs_2nd_stage[0].data_valid.next = first_1d_output.data_valid
            inputs_2nd_stage[1].data_in.next = first_1d_output.out1
            inputs_2nd_stage[1].data_valid.next = first_1d_output.data_valid
            inputs_2nd_stage[2].data_in.next = first_1d_output.out2
            inputs_2nd_stage[2].data_valid.next = first_1d_output.data_valid
            inputs_2nd_stage[3].data_in.next = first_1d_output.out3
            inputs_2nd_stage[3].data_valid.next = first_1d_output.data_valid
            inputs_2nd_stage[4].data_in.next = first_1d_output.out4
            inputs_2nd_stage[4].data_valid.next = first_1d_output.data_valid
            inputs_2nd_stage[5].data_in.next = first_1d_output.out5
            inputs_2nd_stage[5].data_valid.next = first_1d_output.data_valid
            inputs_2nd_stage[6].data_in.next = first_1d_output.out6
            inputs_2nd_stage[6].data_valid.next = first_1d_output.data_valid
            inputs_2nd_stage[7].data_in.next = first_1d_output.out7
            inputs_2nd_stage[7].data_valid.next = first_1d_output.data_valid

    @always_comb
    def second_stage_output():
        if first_1d_output.data_valid:
            outputs.y00.next = outputs_2nd_stage[0].out0
            outputs.y01.next = outputs_2nd_stage[0].out1
            outputs.y02.next = outputs_2nd_stage[0].out2
            outputs.y03.next = outputs_2nd_stage[0].out3
            outputs.y04.next = outputs_2nd_stage[0].out4
            outputs.y05.next = outputs_2nd_stage[0].out5
            outputs.y06.next = outputs_2nd_stage[0].out6
            outputs.y07.next = outputs_2nd_stage[0].out7
            outputs.y10.next = outputs_2nd_stage[1].out0
            outputs.y11.next = outputs_2nd_stage[1].out1
            outputs.y12.next = outputs_2nd_stage[1].out2
            outputs.y13.next = outputs_2nd_stage[1].out3
            outputs.y14.next = outputs_2nd_stage[1].out4
            outputs.y15.next = outputs_2nd_stage[1].out5
            outputs.y16.next = outputs_2nd_stage[1].out6
            outputs.y17.next = outputs_2nd_stage[1].out7
            outputs.y20.next = outputs_2nd_stage[2].out0
            outputs.y21.next = outputs_2nd_stage[2].out1
            outputs.y22.next = outputs_2nd_stage[2].out2
            outputs.y23.next = outputs_2nd_stage[2].out3
            outputs.y24.next = outputs_2nd_stage[2].out4
            outputs.y25.next = outputs_2nd_stage[2].out5
            outputs.y26.next = outputs_2nd_stage[2].out6
            outputs.y27.next = outputs_2nd_stage[2].out7
            outputs.y30.next = outputs_2nd_stage[3].out0
            outputs.y31.next = outputs_2nd_stage[3].out1
            outputs.y32.next = outputs_2nd_stage[3].out2
            outputs.y33.next = outputs_2nd_stage[3].out3
            outputs.y34.next = outputs_2nd_stage[3].out4
            outputs.y35.next = outputs_2nd_stage[3].out5
            outputs.y36.next = outputs_2nd_stage[3].out6
            outputs.y37.next = outputs_2nd_stage[3].out7
            outputs.y40.next = outputs_2nd_stage[4].out0
            outputs.y41.next = outputs_2nd_stage[4].out1
            outputs.y42.next = outputs_2nd_stage[4].out2
            outputs.y43.next = outputs_2nd_stage[4].out3
            outputs.y44.next = outputs_2nd_stage[4].out4
            outputs.y45.next = outputs_2nd_stage[4].out5
            outputs.y46.next = outputs_2nd_stage[4].out6
            outputs.y47.next = outputs_2nd_stage[4].out7
            outputs.y50.next = outputs_2nd_stage[5].out0
            outputs.y51.next = outputs_2nd_stage[5].out1
            outputs.y52.next = outputs_2nd_stage[5].out2
            outputs.y53.next = outputs_2nd_stage[5].out3
            outputs.y54.next = outputs_2nd_stage[5].out4
            outputs.y55.next = outputs_2nd_stage[5].out5
            outputs.y56.next = outputs_2nd_stage[5].out6
            outputs.y57.next = outputs_2nd_stage[5].out7
            outputs.y60.next = outputs_2nd_stage[6].out0
            outputs.y61.next = outputs_2nd_stage[6].out1
            outputs.y62.next = outputs_2nd_stage[6].out2
            outputs.y63.next = outputs_2nd_stage[6].out3
            outputs.y64.next = outputs_2nd_stage[6].out4
            outputs.y65.next = outputs_2nd_stage[6].out5
            outputs.y66.next = outputs_2nd_stage[6].out6
            outputs.y67.next = outputs_2nd_stage[6].out7
            outputs.y70.next = outputs_2nd_stage[7].out0
            outputs.y71.next = outputs_2nd_stage[7].out1
            outputs.y72.next = outputs_2nd_stage[7].out2
            outputs.y73.next = outputs_2nd_stage[7].out3
            outputs.y74.next = outputs_2nd_stage[7].out4
            outputs.y75.next = outputs_2nd_stage[7].out5
            outputs.y76.next = outputs_2nd_stage[7].out6
            outputs.y77.next = outputs_2nd_stage[7].out7

    return second_stage_output, first_stage_to_second, first_1d, stage_2_insts