Progress in presentation

manual/PRESENTATION_ExOth/axis_master.v

@@ -0,0 +1,27 @@
+module axis_master(aclk, aresetn, tvalid, tready, tdata);
+    input aclk, aresetn, tready;
+    output reg tvalid;
+    output reg [7:0] tdata;
+
+    reg [31:0] state;
+    always @(posedge aclk) begin
+        if (!aresetn) begin
+	    state <= 314159265;
+	    tvalid <= 0;
+	    tdata <= 'bx;
+	end else begin
+	    if (tvalid && tready)
+	    	tvalid <= 0;
+	    if (!tvalid || !tready) begin
+	    //             ^- should be not inverted!
+                state = state ^ state << 13;
+                state = state ^ state >> 7;
+                state = state ^ state << 17;
+		if (state[9:8] == 0) begin
+		    tvalid <= 1;
+		    tdata <= state;
+		end
+	    end
+	end
+    end
+endmodule