multiplier.md

Multiplier

ROHD HCL provides a multiplier module to get the product from a list of logic. As of now, we have

• Carry Save Multiplier

Carry Save Multiplier

Carry save multiplier is a digital circuit used for performing multiplication operations. It is particularly useful in applications that require high speed multiplication, such as digital signal processing.

The CarrySaveMultiplier module in ROHD-HCL accept input parameters the clock clk signal, reset reset signal, Logics' a and b as the input pin and the name of the module name. Note that the width of the inputs must be the same or RohdHclException will be thrown.

An example is shown below to multiply two inputs of signals that have 4-bits of width.

const widthLength = 4;
final a = Logic(name: 'a', width: widthLength);
final b = Logic(name: 'b', width: widthLength);
final reset = Logic(name: 'reset');
final clk = SimpleClockGenerator(10).clk;

final csm = CarrySaveMultiplier(clk: clk, reset: reset, a, b);

await csm.build();

reset.inject(0);

Simulator.setMaxSimTime(10000);

unawaited(Simulator.run());

Future<void> waitCycles(int numCycles) async {
    for (var i = 0; i < numCycles; i++) {
        await clk.nextPosedge;
    }
}

a.put(10);
b.put(3);

await waitCycles(csm.latency).then(
    (value) {
        print(csm.product.value.toInt());
    },
);

Simulator.endSimulation();