added sarlogic verilog code
diff --git a/verilog/sarlogic/sarlogic.v b/verilog/sarlogic/sarlogic.v
new file mode 100755
index 0000000..fe656f5
--- /dev/null
+++ b/verilog/sarlogic/sarlogic.v
@@ -0,0 +1,152 @@
+`timescale 1ns/10ps
+
+// Classic SAR algorithm + Offset calibration.
+
+module sarlogic(
+ input clk,
+ input rstn,
+ input en,
+ input comp,
+ input cal,
+ output valid,
+ output [9:0] result,
+ output sample,
+ output [9:0] ctlp,
+ output [9:0] ctln,
+ output [4:0] trim,
+ output [4:0] trimb,
+ output clkc);
+
+ reg calibrate;
+ reg [2:0] state;
+ reg [9:0] mask;
+ reg [4:0] trim_mask;
+ reg [9:0] result;
+ reg [4:0] trim_val;
+ reg sample;
+ reg co_clk;
+ reg en_co_clk;
+ reg [3:0] cal_count;
+ reg [3:0] cal_itt;
+ reg res_valid;
+
+ parameter sInit=0, sWait=1, sSample=2, sConv=3, sDone=4, sCal=5;
+
+ initial begin
+ state <= sInit;
+ mask <= 0;
+ trim_mask <= 0;
+ result <= 0;
+ co_clk <= 0;
+ en_co_clk <= 0;
+ cal_itt <= 0;
+ cal_count <= 7;
+ trim_val <= 0;
+ calibrate <= 0;
+ res_valid <= 0;
+ end
+
+ always @(clk) begin
+ clkc <= (~clk & en_co_clk);
+ end
+
+ always @(posedge clk or negedge rstn) begin
+
+ if (!rstn) begin
+ state <= sInit;
+ mask <= 0;
+ trim_mask <= 0;
+ result <= 0;
+ co_clk <= 0;
+ en_co_clk <= 0;
+ cal_itt <= 0;
+ cal_count <= 7;
+ trim_val <= 0;
+ calibrate <= 0;
+ res_valid <= 0;
+ end
+ else begin
+ case (state)
+
+ sInit : begin
+ trim_val <= 5'b10000;
+ state <= sWait;
+ end
+
+ sWait : begin
+ if(en) begin
+ result <= 0;
+ cal_itt <= 0;
+ cal_count <= 7;
+ state <= sSample;
+ calibrate <= cal;
+ mask <= 10'b1000000000;
+ en_co_clk <= 1;
+ res_valid <= 0;
+ end
+ else state <= sWait;
+ end
+
+ sSample : begin
+ if (calibrate) begin
+ state <= sCal;
+ trim_val <= 5'b00000;
+ trim_mask <= 5'b10000;
+ end
+ else begin
+ state <= sConv;
+ end
+ end
+
+ sConv : begin
+ if (comp) result <= result | mask;
+ mask <= mask >> 1;
+ if (mask[0]) begin
+ state <= sDone;
+ en_co_clk <=0;
+ end
+ end
+
+ sCal: begin
+ if(cal_itt == 7) begin
+ if (cal_count > 7) begin
+ trim_val <= trim_val | trim_mask;
+ end
+ trim_mask <= trim_mask >> 1;
+ if (trim_mask[0]) begin
+ state <= sDone;
+ en_co_clk <=0;
+ calibrate <= 0;
+ end else begin
+ cal_itt = 0;
+ state <= sCal;
+ end
+ cal_count <= 7;
+ end else begin
+ if (comp) begin
+ cal_count <= cal_count - 1;
+ end else begin
+ cal_count <= cal_count + 1;
+ end
+ cal_itt <= cal_itt + 1;
+ end
+ end
+
+ sDone : begin
+ state <= sWait;
+ res_valid <= 1;
+ end
+
+ endcase
+ end
+ end
+
+ assign trim = (trim_val | trim_mask );
+ assign trimb = ~(trim_val | trim_mask);
+ assign sample = (state==sSample) || (state==sCal);
+ assign valid = (1 && res_valid);
+ assign ctlp = result | mask;
+ assign ctln = ~(result | mask);
+
+endmodule
+
