Analysis & Synthesis Error(13224): Verilog HDL or VHDL error "..:" index -8 is out of range [15:0]..

Hi Sheng,

Thank you for your answer.

What you are saying is correct, but it cannot be the cause of this error.

==========

Lines 21, 26 and 27 of vector_capture_synth_top.sv are:

21: parameter W_MCDMA_DATA = 256;

26: parameter W_MODULE_DATA = 16; // Supported data widths (8 bits to 256 bits) power of 2 (2^3 to 2^8)

27: parameter W_MODULE_DESC = 204; // less than or equal to 256

==========

Lines 66 to 70 of vector_capture.sv are:

66: localparam c_DESCBYTEALIGNBITS = ((W_MODULE_DESC % > 0) ? (8 - (W_MODULE_DESC % 8)) : 3'b0;

c_DESCBYTEALIGNBITS = ((204 % > 0) ? (8 - (204 % 8)) : 3'b0

c_DESCBYTEALIGNBITS = (4 > 0) ? (8 - 4) : 3'b0

c_DESCBYTEALIGNBITS = 4

67: logic [((W_MODULE_DESC + c_DESCBYTEALIGNBITS) - 1):0] s_in_desc; // Configuration bus from feeder module

logic [((204 + 4) - 1):0] s_in_desc;

logic [207:0] s_in_desc;

68: localparam c_IN_DESC_BYTE_CNT = ((W_MODULE_DESC + c_DESCBYTEALIGNBITS)/8);

c_IN_DESC_BYTE_CNT = ((204 + 4)/8)

c_IN_DESC_BYTE_CNT = ((208)/8)

c_IN_DESC_BYTE_CNT = 26

69: localparam c_IN_DATA_BYTE_CNT = (W_MODULE_DATA/8);

c_IN_DATA_BYTE_CNT = (16/8)

c_IN_DATA_BYTE_CNT = 2

70: localparam c_OUT_DATA_BYTE_CNT = (W_MCDMA_DATA/8);

c_OUT_DATA_BYTE_CNT = (256/8)

c_OUT_DATA_BYTE_CNT = 32

==========

Lines 140 to 144 of vector_capture.sv are:

140: for (int c = c_IN_DESC_BYTE_CNT; c < c_OUT_DATA_BYTE_CNT; c++)

(int c = 26; c < 32; c++)

Within this for loop, c can take only 26, 27, 28, 29, 30 and 31

141: begin

142: if (c < (c_IN_DESC_BYTE_CNT + (c_IN_DATA_BYTE_CNT - s_in_empty)))

(c < (26 + (2 - s_in_empty)))

(c < (28 - s_in_empty))

Note: s_in_empty is a single bit.

Within this if statement:

If s_in_empty = 0, (c < (28 - 0)) and c can be either 26 or 27

If s_in_empty = 1, (c < (28 - 1)) and c can be either 26

143: s_output_data[c] <= s_in_data[((W_MODULE_DATA - ((c - c_IN_DESC_BYTE_CNT) * 8)) - 1) -: 8];

If c takes 26

s_output_data[26] <= s_in_data[((16 - ((26 - 26) * 8)) - 1) -: 8];

s_output_data[26] <= s_in_data[((16 - ((0) * 8)) - 1) -: 8];

s_output_data[26] <= s_in_data[((16 - (0) - 1) -: 8];

s_output_data[26] <= s_in_data[((16 - 1) -: 8];

s_output_data[26] <= s_in_data[15 -: 8];

s_output_data[26] <= s_in_data[15 : 8];

If c takes 27

s_output_data[26] <= s_in_data[((16 - ((27 - 26) * 8)) - 1) -: 8];

s_output_data[26] <= s_in_data[((16 - ((1) * 8)) - 1) -: 8];

s_output_data[26] <= s_in_data[((16 - (8) - 1) -: 8];

s_output_data[26] <= s_in_data[((8 - 1) -: 8];

s_output_data[26] <= s_in_data[7 -: 8];

s_output_data[26] <= s_in_data[7 : 0];

144: end

From the above calculations, c cannot take any values that drives index of s_in_data to be -8.

Regards,

Ranesh