358 lines
11 KiB
Verilog
358 lines
11 KiB
Verilog
// Eleven basic tests in here:
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// 1. shortint must be initialised before any initial or always block
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// 2. assignments to (signed) shortint with random numbers
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// 3. assignments to (signed) shortint with random values including X and Z
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// 4. converting unsigned integers to signed shortint
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// 5. converting signed integers to signed shortint
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// 6. converting integers including X and Z states to signed shortint
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// 7. trying signed sums (procedural, function, task and module)
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// 8. trying signed mults (procedural, function and task)
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// 9. trying relational operators
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// 10. smaller signed numbers to signed shortint (signed extension)
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// 11. trying some concatenations from bytes to shortints
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module ms_add (input shortint signed a, b, output shortint signed sc, ss);
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assign sc = a + b;
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always @(a, b) ss = a + b;
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endmodule
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module main;
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parameter N_REPS = 500; // repetition with random numbers
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parameter XZ_REPS = 500; // repetition with 'x 'z values
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parameter UMAX = 'h7fff;
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parameter MAX8 = 256;
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parameter LEN = 16;
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// variables used as golden references
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reg signed [LEN-1:0] ar; // holds numbers
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reg signed [LEN-1:0] ar_xz; // holds 'x and/or 'z in random positions
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reg signed [LEN-1:0] ar_expected;
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integer unsigned ui;
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integer signed si;
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reg signed [LEN/2-1:0] slice;
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// type assumed to be tested before hand
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byte signed pt1, pt2;
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// types to be tested
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shortint signed bu; // holds numbers
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shortint signed bu_xz; // 'x and 'z are attempted on this
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shortint signed bresult; // hold results from sums and mults
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shortint signed mcaresult; // wired to a module instance
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shortint signed mabresult; // also wired to a module instance
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integer i;
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// continuous assigments
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// type LHS type RHS
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// --------- ---------
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// shortint 4-value logic
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assign bu = ar;
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assign bu_xz = ar_xz;
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// module instantiation
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ms_add duv (.a(bu), .b(bu_xz), .sc(mcaresult), .ss(mabresult) );
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// all test
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initial begin
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// time 0 checkings (Section 6.4 of IEEE 1850 LRM)
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if (bu !== 16'b0 || bu_xz != 16'b0 || mcaresult !== 16'b0 || mabresult !== 16'b0)
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begin
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$display ("FAILED - time zero initialisation incorrect: %b %b", bu, bu_xz);
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$finish;
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end
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// driving shortint type with signed random numbers from a variable
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for (i = 0; i< N_REPS; i = i+1)
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begin
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#1;
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ar = $random % UMAX;
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#1;
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if (bu !== ar)
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begin
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$display ("FAILED - incorrect assigment to shortint: %b", bu);
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$finish;
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end
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end
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# 1;
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// attempting to drive variables having 'x 'z values into type signed shortint
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// 'x 'z injections (Section 4.3.2 of IEEE 1850 LRM)
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for (i = 0; i< XZ_REPS; i = i+1)
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begin
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#1;
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ar = $random % UMAX;
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ar_xz = xz_inject (ar);
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ar_expected = xz_expected (ar_xz);
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#1;
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if (bu_xz !== ar_expected) // 'x -> '0, 'z -> '0
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begin
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$display ("FAILED - incorrect assigment to shortint (when 'x 'z): %b", bu);
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$finish;
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end
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end
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// converting unsigned integers to signed shortint
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// truncation expected (Section 4.3.2 of IEEE 1850 LRM)
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for (i = 0; i< N_REPS; i = i+1)
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begin
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#1;
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ui = {$random} % 2*(UMAX+1); // full range as unsigned
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#1;
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force bu = ui;
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#1;
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if (bu !== ui[LEN-1:0])
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begin
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$display ("FAILED - incorrect truncation from unsigned integer to shortint: %b", bu);
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$finish;
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end
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end
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release bu;
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// converting signed integers to signed shortints
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// truncation expected (Section 4.3.2 of IEEE 1850 LRM)
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for (i = 0; i< N_REPS; i = i+1)
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begin
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#1;
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si = $random % UMAX;
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#1;
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force bu = si;
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#1;
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if (bu !== si[LEN-1:0])
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begin
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$display ("FAILED - incorrect truncation from signed integer to shortint: %b mismatchs %b", bu, si[LEN-1:0]);
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$finish;
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end
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end
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release bu;
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// converting signed integers having 'x 'z values into type signed shortint
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// 'x 'z injections (Section 4.3.2 of IEEE 1850 LRM)
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// truncation and coercion to zero expected
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for (i = 0; i< XZ_REPS; i = i+1)
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begin
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#1;
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si = $random;
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ar_xz = xz_inject (si[LEN-1:0]);
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si = {si[31:LEN], ar_xz};
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ar_expected = xz_expected (ar_xz);
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#1;
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force bu_xz = si;
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#1;
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if (bu_xz !== ar_expected) // 'x -> '0, 'z -> '0
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begin
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$display ("FAILED - incorrect conversion from integer (with 'x 'z) to shortint: %b mismatchs %b", bu_xz, ar_expected);
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$finish;
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end
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end
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release bu_xz;
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// trying signed sums
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for (i = 0; i< N_REPS; i = i+1)
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begin
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#1;
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ar = $random % UMAX;
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ar_xz = $random % UMAX;
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#1;
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bresult = bu + bu_xz;
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#1;
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if ( bresult !== s_sum(ar, ar_xz) )
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begin
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$display ("FAILED - incorrect addition of signed shortints: %0d mismatchs %0d", bresult, s_sum(ar, ar_xz));
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$finish;
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end
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// invoking shortint sum function
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if ( fs_sum (bu, bu_xz) !== s_sum(ar, ar_xz) )
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begin
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$display ("FAILED - incorrect addition of signed shortint in function");
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$finish;
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end
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// invoking shortint sum task
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ts_sum (bu, bu_xz, bresult);
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if ( bresult !== s_sum(ar, ar_xz) )
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begin
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$display ("FAILED - incorrect addition of signed shortint in task: %0d mismatchs %0d", bresult, s_sum(ar, ar_xz));
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$finish;
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end
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// checking shortint sum from module
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if ( mcaresult !== s_sum(ar, ar_xz) || mabresult !== s_sum(ar, ar_xz))
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begin
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$display ("FAILED - incorrect addition of signed shortint from module");
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$finish;
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end
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end
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// trying signed mults
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for (i = 0; i< N_REPS; i = i+1)
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begin
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#1;
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ar = ($random % UMAX) << LEN/2;
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ar_xz = ($random % UMAX) << (LEN/2 - 1);
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#1;
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bresult = bu * bu_xz; // truncated multiplication
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#1;
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if ( bresult !== sh_mul(ar, ar_xz) )
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begin
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$display ("FAILED - incorrect multiplication of signed shortints (truncated)");
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$finish;
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end
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#1;
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pt1 = $random;
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pt2 = $random;
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#1;
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bresult = pt1 * pt2; // shortint = byte x byte
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#1;
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if ( bresult !== s_mul(pt1, pt2) )
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begin
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$display ("FAILED - incorrect multiplication of signed shortints for input bytes");
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$finish;
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end
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// invoking shortint mult function (byte*byte)
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if ( fs_mul (pt1, pt2) !== s_mul(pt1, pt2) )
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begin
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$display ("FAILED - incorrect product of signed bytes for a function returning signed shortint");
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$finish;
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end
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// invoking shortint mult task (byte*byte)
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ts_mul (pt1, pt2, bresult);
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if ( bresult !== s_mul(pt1, pt2) )
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begin
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$display ("FAILED - incorrect product of signed bytes in task returning signed shortint");
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$finish;
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end
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end
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// trying relational operators
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for (i = 0; i< N_REPS; i = i+1)
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begin
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#1;
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ar = $random % UMAX;
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ar_xz = $random % UMAX;
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#1;
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if ( (bu < bu_xz ) !== (ar < ar_xz) )
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begin
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$display ("FAILED - incorrect 'less than' on signed shortints");
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$finish;
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end
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if ( (bu <= bu_xz ) !== (ar <= ar_xz) )
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begin
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$display ("FAILED - incorrect 'less than or equal' on signed shortints");
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$finish;
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end
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if ( (bu > bu_xz ) !== (ar > ar_xz) )
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begin
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$display ("FAILED - incorrect 'greater than' on signed shortints");
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$finish;
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end
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if ( (bu >= bu_xz ) !== (ar >= ar_xz) )
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begin
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$display ("FAILED - incorrect 'greater than or equal' than on signed shortints");
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$finish;
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end
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if ( (bu == bu_xz ) !== (ar == ar_xz) )
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begin
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$display ("FAILED - incorrect 'equal to' on signed shortints");
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$finish;
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end
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if ( (bu != bu_xz ) !== (ar != ar_xz) )
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begin
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$display ("FAILED - incorrect 'not equal to' on signed shortints");
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$finish;
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end
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end
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# 1;
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// signed small number to signed shorint
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for (i = 0; i < (1<<LEN/2); i = i+1)
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begin
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#1;
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slice = $random % 'h7f;
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force bu = slice;
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ar = slice;
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#1;
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if (bu !== ar)
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begin
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$display ("FAILED - incorrect signed extend to unsigned shortint");
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$finish;
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end
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end
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release bu;
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// trying concatenations
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for (i = 0; i< N_REPS; i = i+1)
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begin
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#1;
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pt1 = $random;
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pt2 = $random;
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#1;
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bresult = {pt1, pt2};
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#1;
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if ( bresult[15:8] !== pt1 || bresult[7:0] !== pt2)
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begin
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$display ("FAILED - incorrect concatenation of signed shortints");
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$finish;
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end
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end
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#1;
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$display("PASSED");
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end
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// this returns X and Z states into bit random positions for a value
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function [LEN-1:0] xz_inject (input signed [LEN-1:0] value);
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integer i, temp;
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begin
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temp = {$random} % 2*(UMAX+1);
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for (i=0; i<LEN; i=i+1)
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begin
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if (temp[i] == 1'b1)
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begin
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temp = $random % UMAX;
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if (temp <= 0)
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value[i] = 1'bx; // 'x noise
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else
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value[i] = 1'bz; // 'z noise
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end
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end
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xz_inject = value;
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end
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endfunction
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// this function returns bit positions with either X or Z to 0 for an input value
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function [LEN-1:0] xz_expected (input signed [LEN-1:0] value_xz);
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integer i;
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begin
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for (i=0; i<LEN; i=i+1)
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begin
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if (value_xz[i] === 1'bx || value_xz[i] === 1'bz )
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value_xz[i] = 1'b0; // forced to zero
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end
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xz_expected = value_xz;
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end
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endfunction
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// unsigned 4-value sum
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function signed [LEN-1:0] s_sum (input signed [LEN-1:0] a, b);
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s_sum = a + b;
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endfunction
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// signed shortint sum as function
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function shortint signed fs_sum (input shortint signed a, b);
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fs_sum = a + b;
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endfunction
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// signed shortint sum as task
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task ts_sum (input shortint signed a, b, output shortint signed c);
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c = a + b;
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endtask
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// unsigned 4-value truncated mults
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function signed [LEN-1:0] sh_mul (input signed [LEN-1:0] a, b);
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sh_mul = a * b;
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endfunction
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// unsigned 4-value mults
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function signed [LEN-1:0] s_mul (input signed [LEN/2-1:0] a, b);
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s_mul = a * b;
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endfunction
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// signed shortint mult as function
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function shortint signed fs_mul (input byte signed a, b);
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fs_mul = a * b;
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endfunction
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// signed shortint mult as task
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task ts_mul (input byte signed a, b, output shortint signed c);
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c = a * b;
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endtask
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endmodule
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