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diff --git a/source/mdio.v b/source/mdio.v
deleted file mode 100644
index 3339dcc..0000000
--- a/source/mdio.v
+++ /dev/null
@@ -1,146 +0,0 @@
-/*
- *      mdio.v
- *
- *   Copyright (C) 2018, 2019 Mind Chasers Inc.
- *
- *   Licensed under the Apache License, Version 2.0 (the "License");
- *   you may not use this file except in compliance with the License.
- *   You may obtain a copy of the License at
- *
- *       http://www.apache.org/licenses/LICENSE-2.0
- *
- *   Unless required by applicable law or agreed to in writing, software
- *   distributed under the License is distributed on an "AS IS" BASIS,
- *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- *   See the License for the specific language governing permissions and
- *   limitations under the License.
- *
- *	function: MDIO HW driver / bit banger
- *	
- */
-
-
-`timescale 1ns /10ps
-
-module mdio(
-	input rstn,
-	input mdc,				// clock
-	
-	// mdio 
-	input mdi,
-	output reg mdo,
-	output reg mdo_oe,
-	
-	// mdio_controller interface
-	input rwn,				// read / write not
-	input [4:0] phy_addr,		
-	input [4:0] reg_addr,
-	input [15:0] di,
-	input ld,				// load, start
-	output reg run,
-	output done,            // mdio xfer is done
-	
-	// output port to converter
-	output reg [15:0] dout,
-	output we
-);
-	
-	reg [5:0] state;
-	reg [15:0] d;  
-	
-	// run state machine
-	// run starts when ld is asserted and finishes when done is asserted
-    always @(negedge mdc or negedge rstn)	
-		begin
-			if ( !rstn)
-				run <= 1'b0;
-			else if ( ld )
-				run <= 1'b1;				
-			else if ( done )
-				run <= 1'b0;
-		end
-
-
-	// increment state during run
-    always @(negedge mdc or negedge rstn) 
-		begin 
-			if ( !rstn )
-				state <= 0;
-			else if ( ld ) 
-				state <= 0;
-			else if ( run ) 
-				state <= state + 1;
-		end
-		
-	// register data for MDIO TX
-    always @(negedge mdc or negedge rstn)	
-		begin
-			if ( !rstn )
-				d <= 0;
-			else if ( ld )
-				d <= di;				
-		end
-				
-	// done combo logic
-	assign done = ( state == 6'd36 ) ? 1'b1 : 1'b0;
-
-	// only assert we on mdio reads 
-	assign we = done && rwn;	
-				
-	// mdo_oe logic
-	always @(*)
-		begin
-			mdo_oe = 1'b0;
-			if ( run && !rwn && state < 6'd36 )
-				mdo_oe = 1'b1;
-			else if ( run && rwn && state < 6'd14 )
-				mdo_oe = 1'b1;
-		end			
-	
-	// mdo mux
-	always @(*)
-		begin
-			mdo = 1'b0;
-			casez(state)
-				6'h0: 	mdo = 1'b0;
-				6'h1: 	mdo = 1'b1;
-				6'h2: 	if (rwn)
-							mdo = 1'b1;
-						else
-							mdo = 1'b0;
-				6'h3: 	if (rwn)
-							mdo = 1'b0;
-						else
-							mdo = 1'b1;
-				6'h4:	mdo = phy_addr[4];
-				6'h5:	mdo = phy_addr[3];
-				6'h6:	mdo = phy_addr[2];
-				6'h7:	mdo = phy_addr[1];
-				6'h8:	mdo = phy_addr[0];
-				6'h9:	mdo = reg_addr[4];
-				6'ha:	mdo = reg_addr[3];
-				6'hb:	mdo = reg_addr[2];
-				6'hc:	mdo = reg_addr[1];
-				6'hd:	mdo = reg_addr[0];
-				6'he: 	mdo = 1'b1;			// it's a don't care if we're doing a read
-				6'hf:	mdo = 1'b0;
-				6'h1?:	mdo = rwn ? 1'b1 : d[31-state];		// msbit
-				default: mdo = 1'b1;
-			endcase
-		end	
-		
-		
-	/*
-	*	capture mdi on rising edge
-	* 	data out shift register 
-	*	( shift into it from mdio to parallel reg )
-	*/
-    always @(posedge mdc or negedge rstn)	
-		begin
-			if ( !rstn )
-				dout <= 16'h0;
-			else if ( rwn && run && ( state >= 16 && state <= 31 ))
-				dout <= { dout[14:0], mdi };
-		end
-	
-endmodule