Assignment

Assignment statement is variable = expression;. Unlike SystemVerilog, assignment operator is = in both always_comb and always_ff. There are other assignment operators:

• +=: addition assignment
• -=: subtraction assignment
• *=: multiplication assignment
• /=: division assignment
• %=: remainder assignment
• &=: bitwise AND assignment
• |=: bitwise OR assignment
• ^=: bitwise XOR assignment
• <<=: logical left shift assignment
• >>=: logical right shift assignment
• <<<=: arithmetic left shift assignment
• >>>=: arithmetic right shift assignment

module ModuleA (
    i_clk: input clock,
) {
    let a: logic<10> = 1;
    var b: logic<10>;
    var c: logic<10>;
    var d: logic<10>;
    var e: logic<10>;

    always_comb {
        b =  a + 1;
        c += a + 1;
    }

    always_ff (i_clk) {
        d =  a + 1;
        e -= a + 1;
    }
}