2.7. Optimizing module pins

This example demonstrate how to optimize the module pins based on the connectivity of the current instances.

Before Optimization

After Optimization

import logging

import spydrnet as sdn
from spydrnet_physical.composers.svg.composer import SVGComposer

logger = logging.getLogger('spydrnet_logs')
sdn.enable_file_logging(LOG_LEVEL="DEBUG", filename="pin_opt")

2.7.1. Example 1

with open("_simple_design.v", "w", encoding="UTF-8") as fp:
    fp.write('''
    module top(in0, out);
        input in0;
        output [1:0]out;

        block1 instance1 (.in0(in0), .in1(in0), .out(out[0]));
        block1 instance2 (.in0(in0), .in1(in0), .out(out[1]));

    endmodule

    `celldefine
    module block1(in0, in1, out);
        input in0;
        input in1;
        output out;

    endmodule
    `endcelldefine
    ''')


with open("_simple_design.v", "w", encoding="UTF-8") as fp:
    fp.write('''
    module top(in0, out);
        input in0;
        output out;

        wire mid_out;

        block1 instance1 (.in0(in0), .in1(mid_out), .out(out));
        block2 instance2 (.in0(in0), .in1(mid_out), .in3(mid_out), .out(mid_out));

    endmodule

    `celldefine
    module block1(in0, in1, out);
        input in0;
        input in1;
        output out;

    endmodule
    `endcelldefine

    `celldefine
    module block2(in0, in1, in3, out);
        input in0;
        input in1;
        input in3;
        output out;

    endmodule
    `endcelldefine
    ''')

netlist = sdn.parse("_simple_design.v")

composer = SVGComposer()
composer.run(netlist, file_out="_simple_design.svg")

next(netlist.get_definitions("block2")).OptPins()

composer = SVGComposer()
composer.run(netlist, file_out="_simple_design_post_opt_pins.svg")
sdn.compose(netlist, '_simple_design_post_opt_pins.v', skip_constraints=True)