summaryrefslogtreecommitdiffhomepage
path: root/source/mdio_data_ti.v
blob: aef537dff354fe0b4fac2f78e85e14235be98ada (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
/*
 *   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
	



X-ray Engineering Services