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author | Yann Herklotz <git@yannherklotz.com> | 2022-02-28 12:49:35 +0000 |
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committer | Yann Herklotz <git@yannherklotz.com> | 2022-02-28 12:49:35 +0000 |
commit | 88d015ba178665ee21b282f364ccf047522e3b1c (patch) | |
tree | d1b642922e8d3cf5559285a86dfce5d5e0860e64 /ip/div_unsigned.v | |
parent | 1252ed9252abc91dec15a240e2866d5344d3d81f (diff) | |
download | vericert-88d015ba178665ee21b282f364ccf047522e3b1c.tar.gz vericert-88d015ba178665ee21b282f364ccf047522e3b1c.zip |
Rename IP using systemverilog extension
Diffstat (limited to 'ip/div_unsigned.v')
-rw-r--r-- | ip/div_unsigned.v | 146 |
1 files changed, 0 insertions, 146 deletions
diff --git a/ip/div_unsigned.v b/ip/div_unsigned.v deleted file mode 100644 index db70758..0000000 --- a/ip/div_unsigned.v +++ /dev/null @@ -1,146 +0,0 @@ -///////////////////////////////////////////////////////////////////// -//// //// -//// Non-restoring unsigned divider //// -//// //// -//// Author: Richard Herveille //// -//// richard@asics.ws //// -//// www.asics.ws //// -//// //// -///////////////////////////////////////////////////////////////////// -//// //// -//// Copyright (C) 2002 Richard Herveille //// -//// richard@asics.ws //// -//// //// -//// This source file may be used and distributed without //// -//// restriction provided that this copyright statement is not //// -//// removed from the file and that any derivative work contains //// -//// the original copyright notice and the associated disclaimer.//// -//// //// -//// THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY //// -//// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED //// -//// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS //// -//// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR //// -//// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, //// -//// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES //// -//// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE //// -//// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR //// -//// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF //// -//// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT //// -//// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT //// -//// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE //// -//// POSSIBILITY OF SUCH DAMAGE. //// -//// //// -///////////////////////////////////////////////////////////////////// - -`timescale 1 ns / 1 ns - -module div_unsigned(clock, clken, numer, denom, quotient, remain); - - // - // parameters - // - parameter stages = 32; // controls # of pipeline stages - localparam width = stages; - parameter z_width = 2*width; // internally used width - - parameter width_n = width; // width of numerator and quotient <= width - parameter width_d = width; // width of denominator and remainder <= width - - // - // inputs & outputs - // - input clock; // system clock - input clken; // clock enable - - input [width_n -1:0] numer; // dividend - input [width_d -1:0] denom; // divisor - output [width_n -1:0] quotient; // quotient - output [width_d -1:0] remain; // remainder - reg [width_n-1:0] quotient = {(width_n){1'b0}}; - reg [width_d-1:0] remain = {(width_d){1'b0}}; - - // - // functions - // - function [z_width:0] gen_s; - input [z_width:0] si; - input [z_width:0] di; - begin - if(si[z_width]) - gen_s = {si[z_width-1:0], 1'b0} + di; - else - gen_s = {si[z_width-1:0], 1'b0} - di; - end - endfunction - - function [width-1:0] gen_q; - input [width-1:0] qi; - input [z_width:0] si; - begin - gen_q = {qi[width-2:0], ~si[z_width]}; - end - endfunction - - function [width-1:0] assign_s; - input [z_width:0] si; - input [z_width:0] di; - reg [z_width:0] tmp; - begin - if(si[z_width]) - tmp = si + di; - else - tmp = si; - - assign_s = tmp[z_width-1:z_width-width]; - end - endfunction - - // - // variables - // - reg [width-1:0] q_pipe [width-1:0]; - reg [z_width:0] s_pipe [width:0]; - reg [z_width:0] d_pipe [width:0]; - - integer n0, n1, n2; - - // generate divisor (d) pipe - always @(denom) - begin - d_pipe[0] <= {1'b0, {(width-width_d){1'b0}}, denom, {(z_width-width){1'b0}} }; - end - - always @(posedge clock) - if(clken) - for(n0=1; n0 <= width; n0=n0+1) - d_pipe[n0] <= d_pipe[n0-1]; - - // generate internal remainder pipe - always @(numer) - begin - s_pipe[0] <= {{(width){1'b0}}, {(width-width_d){1'b0}}, numer}; - end - - always @(posedge clock) - if(clken) - for(n1=1; n1 <= width; n1=n1+1) - s_pipe[n1] <= gen_s(s_pipe[n1-1], d_pipe[n1-1]); - - // generate quotient pipe - always @(posedge clock) - q_pipe[0] <= 0; - - always @(posedge clock) - if(clken) - for(n2=1; n2 < width; n2=n2+1) - q_pipe[n2] <= gen_q(q_pipe[n2-1], s_pipe[n2]); - - - always @(posedge clock) - if(clken) - quotient <= gen_q(q_pipe[width-1], s_pipe[width]); - - always @(posedge clock) - if(clken) - remain <= assign_s(s_pipe[width], d_pipe[width]); -endmodule |