NV_NVDLA_CACC_CALC_int8.v

// ================================================================
// NVDLA Open Source Project
//
// Copyright(c) 2016 - 2017 NVIDIA Corporation. Licensed under the
// NVDLA Open Hardware License; Check "LICENSE" which comes with
// this distribution for more information.
// ================================================================
// File Name: NV_NVDLA_CACC_CALC_int8.v
module NV_NVDLA_CACC_CALC_int8 (
   nvdla_core_clk
  ,nvdla_core_rstn
  ,cfg_truncate
  ,in_data
  ,in_op
  ,in_op_valid
  ,in_sel
  ,in_valid
  ,out_final_data
  ,out_final_sat
  ,out_final_valid
  ,out_partial_data
  ,out_partial_valid
  );
input [4:0] cfg_truncate;
input [21:0] in_data;
input [33:0] in_op;
input in_op_valid;
input in_sel;
input in_valid;
output [31:0] out_final_data;
output out_final_sat;
output out_final_valid;
output [33:0] out_partial_data;
output out_partial_valid;
input nvdla_core_clk;
input nvdla_core_rstn;
reg [32:0] i_sat_bits;
reg i_sat_sel;
reg i_sat_vld;
reg [34:0] i_sum_pd;
reg [31:0] out_final_data;
reg out_final_sat;
reg out_final_valid;
reg [33:0] out_partial_data;
reg out_partial_valid;
wire [21:0] di_pd;
wire [31:0] i_final_result;
wire i_final_vld;
wire i_guide;
wire [33:0] i_partial_result;
wire i_partial_vld;
wire i_point5;
wire [31:0] i_pos_pd;
wire [33:0] i_pre_sft_pd;
wire [33:0] i_sat_pd;
wire i_sat_sign;
wire i_sel;
wire [31:0] i_sft_max;
wire i_sft_need_sat;
wire [33:0] i_sft_pd;
wire [14:0] i_stick;
wire i_sum_msb;
wire [34:0] i_sum_pd_nxt;
wire i_sum_sign;
wire [31:0] i_tru_pd;
wire i_vld;
wire [33:0] in_mask_op;
wire mon_pos_pd_c;
wire [33:0] oi_pd;
assign i_sel = in_sel;
assign i_vld = in_valid;
assign in_mask_op = in_op_valid ? in_op[33:0] : 34'b0;
assign di_pd = in_data[21:0];
assign oi_pd = in_mask_op[33:0];
always @(posedge nvdla_core_clk or negedge nvdla_core_rstn) begin
  if (!nvdla_core_rstn) begin
    i_sat_vld <= 1'b0;
  end else begin
  i_sat_vld <= i_vld;
  end
end
always @(posedge nvdla_core_clk or negedge nvdla_core_rstn) begin
  if (!nvdla_core_rstn) begin
    i_sat_sel <= 1'b0;
  end else begin
  if ((i_vld) == 1'b1) begin
    i_sat_sel <= i_sel;
// VCS coverage off
  end else if ((i_vld) == 1'b0) begin
  end else begin
    i_sat_sel <= 'bx; // spyglass disable STARC-2.10.1.6 W443 NoWidthInBasedNum-ML -- (Constant containing x or z used, Based number `bx contains an X, Width specification missing for based number)
// VCS coverage on
  end
  end
end
//====================
// Addition
//====================
assign i_sum_pd_nxt[34:0] = $signed(di_pd) + $signed(oi_pd);
always @(posedge nvdla_core_clk) begin
  if ((i_vld) == 1'b1) begin
    i_sum_pd <= i_sum_pd_nxt;
// VCS coverage off
  end else if ((i_vld) == 1'b0) begin
  end else begin
    i_sum_pd <= 'bx; // spyglass disable STARC-2.10.1.6 W443 NoWidthInBasedNum-ML -- (Constant containing x or z used, Based number `bx contains an X, Width specification missing for based number)
// VCS coverage on
  end
end
//====================
// narrow down to 34bit, and need satuation only
//====================
assign i_sum_sign = i_sum_pd[34 +1 -1];
assign i_sum_msb = i_sum_pd[34 +1 -2];
assign i_sat_sign = i_sum_sign;
always @(
  i_sum_sign
  or i_sum_msb
  or i_sum_pd
  ) begin
    if (i_sum_sign ^ i_sum_msb) begin // overflow, need satuation
        i_sat_bits = {33{~i_sum_sign}};
    end else begin
        i_sat_bits = i_sum_pd[32:0];
    end
end
assign i_sat_pd = {i_sat_sign,i_sat_bits};
assign i_partial_result = i_sat_pd;
//====================
// narrow down to 32bit, and need rounding and satuation
//====================
assign i_pre_sft_pd = i_sat_sel ? i_sat_pd[33:0] : {34{1'b0}};
assign {i_sft_pd[33:0], i_guide, i_stick[14:0]} = ($signed({i_pre_sft_pd, 16'b0}) >>> cfg_truncate);
assign i_sft_need_sat = (i_sat_sign & ~(&i_sft_pd[32:31])) |
                        (~i_sat_sign & (|i_sft_pd[32:31])) |
                        (~i_sat_sign & (&{i_sft_pd[30:0], i_point5}));
assign i_sft_max = i_sat_sign ? {1'b1, 31'b0} : ~{1'b1, 31'b0};
assign i_point5 = i_sat_sel & i_guide & (~i_sat_sign | (|i_stick));
assign {mon_pos_pd_c, i_pos_pd[31:0]} = i_sft_pd[31:0] + i_point5;
assign i_tru_pd = i_pos_pd;
assign i_final_result = i_sft_need_sat ? i_sft_max : i_tru_pd;
assign i_partial_vld = i_sat_vld & ~i_sat_sel;
assign i_final_vld = i_sat_vld & i_sat_sel;
//====================
always @(posedge nvdla_core_clk or negedge nvdla_core_rstn) begin
  if (!nvdla_core_rstn) begin
    out_partial_valid <= 1'b0;
  end else begin
  out_partial_valid <= i_partial_vld;
  end
end
// spyglass disable_block STARC05-3.3.1.4b
always @(posedge nvdla_core_clk) begin
  if ((i_partial_vld) == 1'b1) begin
    out_partial_data <= i_partial_result;
// VCS coverage off
  end else if ((i_partial_vld) == 1'b0) begin
  end else begin
    out_partial_data <= 'bx; // spyglass disable STARC-2.10.1.6 W443 NoWidthInBasedNum-ML -- (Constant containing x or z used, Based number `bx contains an X, Width specification missing for based number)
// VCS coverage on
  end
end
// spyglass enable_block STARC05-3.3.1.4b
always @(posedge nvdla_core_clk or negedge nvdla_core_rstn) begin
  if (!nvdla_core_rstn) begin
    out_final_valid <= 1'b0;
  end else begin
  out_final_valid <= i_final_vld;
  end
end
always @(posedge nvdla_core_clk or negedge nvdla_core_rstn) begin
  if (!nvdla_core_rstn) begin
    out_final_sat <= 1'b0;
  end else begin
  out_final_sat <= i_final_vld & i_sft_need_sat;
  end
end
// spyglass disable_block STARC05-3.3.1.4b
always @(posedge nvdla_core_clk) begin
  if ((i_final_vld) == 1'b1) begin
    out_final_data <= i_final_result;
// VCS coverage off
  end else if ((i_final_vld) == 1'b0) begin
  end else begin
    out_final_data <= 'bx; // spyglass disable STARC-2.10.1.6 W443 NoWidthInBasedNum-ML -- (Constant containing x or z used, Based number `bx contains an X, Width specification missing for based number)
// VCS coverage on
  end
end
// spyglass enable_block STARC05-3.3.1.4b
//VCS coverage off
`ifndef DISABLE_FUNCPOINT
  `ifdef ENABLE_FUNCPOINT
    reg funcpoint_cover_off;
    initial begin
        if ( $test$plusargs( "cover_off" ) ) begin
            funcpoint_cover_off = 1'b1;
        end else begin
            funcpoint_cover_off = 1'b0;
        end
    end
    property cacc_calc_int8__partial_sum_need_sat__0_cov;
        disable iff((nvdla_core_rstn !== 1) || funcpoint_cover_off)
        @(posedge nvdla_core_clk)
        i_sum_sign ^ i_sum_msb;
    endproperty
// Cover 0 : "i_sum_sign ^ i_sum_msb"
    FUNCPOINT_cacc_calc_int8__partial_sum_need_sat__0_COV : cover property (cacc_calc_int8__partial_sum_need_sat__0_cov);
  `endif
`endif
//VCS coverage on
//VCS coverage off
`ifndef DISABLE_FUNCPOINT
  `ifdef ENABLE_FUNCPOINT
    property cacc_calc_int8__out32_need_sat_pos__1_cov;
        disable iff((nvdla_core_rstn !== 1) || funcpoint_cover_off)
        @(posedge nvdla_core_clk)
        i_sft_need_sat & ~i_sat_sign & ~i_point5;
    endproperty
// Cover 1 : "i_sft_need_sat & ~i_sat_sign & ~i_point5"
    FUNCPOINT_cacc_calc_int8__out32_need_sat_pos__1_COV : cover property (cacc_calc_int8__out32_need_sat_pos__1_cov);
  `endif
`endif
//VCS coverage on
//VCS coverage off
`ifndef DISABLE_FUNCPOINT
  `ifdef ENABLE_FUNCPOINT
    property cacc_calc_int8__out32_round_need_sat_pos__2_cov;
        disable iff((nvdla_core_rstn !== 1) || funcpoint_cover_off)
        @(posedge nvdla_core_clk)
        i_sft_need_sat & ~i_sat_sign & i_point5;
    endproperty
// Cover 2 : "i_sft_need_sat & ~i_sat_sign & i_point5"
    FUNCPOINT_cacc_calc_int8__out32_round_need_sat_pos__2_COV : cover property (cacc_calc_int8__out32_round_need_sat_pos__2_cov);
  `endif
`endif
//VCS coverage on
//VCS coverage off
`ifndef DISABLE_FUNCPOINT
  `ifdef ENABLE_FUNCPOINT
    property cacc_calc_int8__out32_round_need_sat_neg__3_cov;
        disable iff((nvdla_core_rstn !== 1) || funcpoint_cover_off)
        @(posedge nvdla_core_clk)
        i_sft_need_sat & i_sat_sign;
    endproperty
// Cover 3 : "i_sft_need_sat & i_sat_sign"
    FUNCPOINT_cacc_calc_int8__out32_round_need_sat_neg__3_COV : cover property (cacc_calc_int8__out32_round_need_sat_neg__3_cov);
  `endif
`endif
//VCS coverage on
endmodule // NV_NVDLA_CACC_CALC_int8