reqack/lib/fork-ctrl.js

elastic logic circuit tools

'use strict';

const express = require('./express.js');

const forkCtrl = p => {

    let res = [];

    res = res.concat((p.targets.length > 1)
        ? 'reg  ' + p.targets.map((e, ei) => `ack${p.id}_${ei}_r`).join(', ')
        : []
    );

    res = res.concat((p.targets.length > 1)
        ? 'wire ' + p.targets.map((e, ei) => `ack${p.id}_${ei}_s`).join(', ')
        : []
    );

    res = res.concat((p.targets.length > 1)
        ? p.targets.map((e, ei) =>
            `assign req${p.id}_${ei} = req${p.id}m & ~ack${p.id}_${ei}_r`)
        : [`assign req${p.id}_0 = req${p.id}m`]
    );

    res = res.concat((p.targets.length > 1)
        ? p.targets.map((e, ei) =>
            `assign ack${p.id}_${ei}_s = ack${p.id}_${ei} | ~req${p.id}_${ei}`)
        : []
    );

    const ackm = (p.targets.length > 1)
        ? p.targets.map((e, ei) => `ack${p.id}_${ei}_s`).join(' & ')
        : `ack${p.id}_0`;

    res = res.concat(`assign ack${p.id}m = ${ackm}`);

    res = res.concat((p.targets.length > 1)
        ? p.targets.map((e, ei) =>
            `always @(posedge clk or negedge reset_n) if (~reset_n) ack${p.id}_${ei}_r <= 1'b0; else ack${p.id}_${ei}_r <= ack${p.id}_${ei}_s & ~ack${p.id}m`)
        : []
    );

    return `// edge:${p.id} fork
${express(res)}`;
};

module.exports = forkCtrl;