ModelSim PE problem or design problem? Give solution

bounds of part-select into are reversed modelsim

Hi all,

I have a piece of code as below. When Iam trying to simulate it in modelsim PE, it is giving me the following compilation errors.

Bounds of part-select into 'af_addr_r' are reversed.

My code is

localparam COL_WIDTH = `COLUMN_ADDRESS;
localparam ROW_WIDTH = `ROW_ADDRESS;
generate
if (COL_WIDTH == ROW_WIDTH-1) begin: gen_ddr_addr_col_0
assign ddr_addr_col = {af_addr_r[COL_WIDTH-1:10], 1'b0,
af_addr_r[9:0]};
end else begin
if (COL_WIDTH > 10) begin: gen_ddr_addr_col_1
assign ddr_addr_col = {{(ROW_WIDTH-COL_WIDTH-1){1'b0}},
af_addr_r[COL_WIDTH-1:10], 1'b0,
af_addr_r[9:0]};
end else begin: gen_ddr_addr_col_2
assign ddr_addr_col = {{(ROW_WIDTH-COL_WIDTH-1){1'b0}}, 1'b0,
af_addr_r[COL_WIDTH-1:0]};
end
end
endgenerate


Iam getting erros for only particular case. When rowaddress is 12 and column address is 10.

Thanks
vjm

Re: bounds of part-select into are reversed modelsim

Hi,

Did you fine the resolution for the issue.I am facing the same issue
with questa 6.6e.
If yes can you kindly guide me through the resolution

Thanks and Regards
Praween

how do you declare af_addr_r

af_addr_r[COL_WIDTH-1:10], with COL_WIDTH = `COLUMN_ADDRESS = 10, you have af_addr_r[9:10], I don't knwo how you declare this but in generate is [x:y], x is greatert or equal to y, isn't it?