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module range_shift_mask(
input logic [2:0] addr_i,
input logic [7:0] data_i,
input logic [2:0] addr_o,
output logic [7:0] data_o
);
(* nowrshmsk = 0 *)
struct packed {
logic [7:0] msb;
logic [0:3][7:0] data;
logic [7:0] lsb;
} s;
always_comb begin
s = '1;
s.data[addr_i] = data_i;
data_o = s.data[addr_o];
end
endmodule
module range_case(
input logic [2:0] addr_i,
input logic [7:0] data_i,
input logic [2:0] addr_o,
output logic [7:0] data_o
);
(* nowrshmsk = 1 *)
struct packed {
logic [7:0] msb;
logic [0:3][7:0] data;
logic [7:0] lsb;
} s;
always_comb begin
s = '1;
s.data[addr_i] = data_i;
data_o = s.data[addr_o];
end
endmodule
module top;
logic [7:0] data_shift_mask1;
range_shift_mask range_shift_mask1(3'd1, 8'h7e, 3'd1, data_shift_mask1);
logic [7:0] data_shift_mask2;
range_shift_mask range_shift_mask2(3'd1, 8'h7e, 3'd2, data_shift_mask2);
logic [7:0] data_shift_mask3;
range_shift_mask range_shift_mask3(3'd1, 8'h7e, 3'd4, data_shift_mask3);
always_comb begin
assert(data_shift_mask1 === 8'h7e);
assert(data_shift_mask2 === 8'hff);
assert(data_shift_mask3 === 8'hxx);
end
logic [7:0] data_case1;
range_case range_case1(3'd1, 8'h7e, 3'd1, data_case1);
logic [7:0] data_case2;
range_case range_case2(3'd1, 8'h7e, 3'd2, data_case2);
logic [7:0] data_case3;
range_case range_case3(3'd1, 8'h7e, 3'd4, data_case3);
always_comb begin
assert(data_case1 === 8'h7e);
assert(data_case2 === 8'hff);
assert(data_case3 === 8'hxx);
end
endmodule
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