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+/*
+ *   mdio_data_ti.v  ( TI DP83867 PHY )
+ *
+ *   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 ROM for TI DP83867 PHY 
+ *	
+ */
+
+
+
+`timescale 1ns /10ps
+
+module mdio_data_ti #(parameter ADDR_SZ = 7)
+(
+	// params that alter the data returned
+	input [4:0] page,
+	input [4:0] reg_addr,
+	input [7:0] data_in_h,
+	input [7:0] data_in_l,
+	
+	// ROM interface
+	input oe,
+	input [ADDR_SZ-1:0]ad,	
+	output [7:0]d
+);
+
+localparam R = 8'h20;
+localparam W = 8'h00;
+localparam EOP = 8'h80;
+
+localparam REGCR = 5'h0d;
+localparam ADDAR = 5'h0e;
+
+reg [7:0]data;
+
+assign d = oe ? data : 8'hzz;
+
+// register 22 is page       
+always @ (*)
+begin
+	case (ad)	
+		/* 
+			Subroutine: SGMII Init ( i ) Not Needed for TI PHY, but read PHY Control Register (PHYCR), Address 0x0010
+		*/	
+		
+		// read the PHYCR register, SGMII Enable is bill 11
+		0: data = R|8'h10;		// pg 18, reg 20
+		
+		/* 
+			Subroutine: Read Live Status ( s )
+		*/
+		// read the live copper status PHYSTS (0x17) 
+		20 : data = R|8'h11;	// read addr[17]
+		
+		/* 
+			Subroutine: Dump Registers 0:3
+		*/
+		25: data = R|8'd0;
+		26 : data = R|8'd1;
+		27 : data = R|8'd2;
+		28 : data = R|8'd3;
+		
+		/* 
+			Subroutine: : Loopback ( 0_0.14 )
+		*/
+		40 : data = W|8'd0;				// write addr[0]
+		44 : data = 8'b01000000;		// collision, speed select, reserved
+		45 : data = 8'b01010001;		// reset, loopback, speed, AN enable, power down, isolate, restart AN, duplex;
+		
+		// read it back
+		46: data = R|8'd0;
+		
+		/* 
+			Subroutine: : Read a register.
+		*/
+		48: data = { 3'b001, reg_addr };
+		
+		/* 
+			Subroutine: : Write a register.
+		*/
+		50: data = { 3'b000, reg_addr };
+		51: data = data_in_l;
+		52: data = data_in_h;
+		// read it back		
+		// 53: data = { 3'b001, reg_addr };
+		
+		// y: extended read
+		60: data = {3'b000 , REGCR };		
+		61: data = 8'h1f;
+		62: data = 8'h00;
+		// Write the extended address to 0xe
+		63: data = { 3'b000, ADDAR };
+		64: data = data_in_l;
+		65: data = data_in_h;
+		// Write 0x401f to 0xd
+		66: data = { 3'b000, REGCR };
+		67: data = 8'h1f;
+		68: data = 8'h40;
+		// Read value in extended register: read 0x0E
+		69: data = { 3'b001, ADDAR  };		
+		
+		// z: extended write
+		// Write value in extended register: 0x0E
+		80: data = { 3'b000, ADDAR };
+		81: data = data_in_l;
+		82: data = data_in_h;
+		// read it back		
+		83: data = { 3'b001, ADDAR  };
+		
+		default: data = R|EOP;
+	endcase
+end
+
+endmodule
+