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
|
//
// Copyright 2013 Ettus Research LLC
// Copyright 2018 Ettus Research, a National Instruments Company
//
// SPDX-License-Identifier: LGPL-3.0-or-later
//
module pcie_basic_regs #(
parameter SIGNATURE = 32'h0,
parameter CLK_FREQ = 32'h0
) (
input clk,
input reset,
input [63:0] regi_tdata,
input regi_tvalid,
output regi_tready,
output [63:0] rego_tdata,
output rego_tvalid,
input rego_tready,
input [31:0] misc_status
);
localparam PCIE_FPGA_SIG_VAL = SIGNATURE;
localparam PCIE_FPGA_COUNTER_FREQ = CLK_FREQ;
localparam PCIE_REG_ADDR_MASK = 20'h001FF;
localparam PCIE_FPGA_SIG_REG_ADDR = 20'h00000; //32-bit
localparam PCIE_FPGA_COUNTER_LO_REG_ADDR = 20'h00004; //32-bit
localparam PCIE_FPGA_COUNTER_HI_REG_ADDR = 20'h00008; //32-bit
localparam PCIE_FPGA_COUNTER_FREQ_ADDR = 20'h0000C; //32-bit
localparam PCIE_FPGA_SCRATCH0_ADDR = 20'h00010; //32-bit
localparam PCIE_FPGA_SCRATCH1_ADDR = 20'h00014; //32-bit
localparam PCIE_FPGA_MISC_STATUS_ADDR = 20'h00020; //32-bit
localparam PCIE_FPGA_USR_SIG_REG_ADDR = 20'h00030; //128-bit
wire regi_wr, regi_rd;
wire [19:0] regi_addr, regi_addr_local;
wire [31:0] regi_payload;
reg [31:0] rego_payload;
ioport2_msg_decode regi_decoder (
.message(regi_tdata), .wr_request(regi_wr), .rd_request(regi_rd),
.address(regi_addr), .data(regi_payload)
);
ioport2_msg_encode rego_encoder (
.rd_response(1'b1), .data(rego_payload), .message(rego_tdata)
);
assign regi_tready = (regi_tvalid & regi_wr) | rego_tready;
assign rego_tvalid = regi_tvalid & regi_rd;
assign regi_addr_local = regi_addr & PCIE_REG_ADDR_MASK;
//Counter counting bus_clk cycles
reg [63:0] bus_counter;
always @(posedge clk) begin
if (reset) bus_counter <= 64'h0;
else bus_counter <= bus_counter + 1;
end
//Scratch registers
reg [63:0] scratch;
always @(posedge clk) begin
if (reset)
scratch <= 64'h0;
else if (regi_tvalid & regi_tready & regi_wr)
if (regi_addr_local == PCIE_FPGA_SCRATCH0_ADDR)
scratch[31:0] <= regi_payload;
else if (regi_addr_local == PCIE_FPGA_SCRATCH1_ADDR)
scratch[63:32] <= regi_payload;
end
//User signature register
reg [127:0] usr_signature;
always @(posedge clk) begin
if (reset)
usr_signature <= 128'h0;
else if (regi_tvalid & regi_tready & regi_wr)
if (regi_addr_local == (PCIE_FPGA_USR_SIG_REG_ADDR + 20'h00000))
usr_signature[31:0] <= regi_payload;
else if (regi_addr_local == (PCIE_FPGA_USR_SIG_REG_ADDR + 20'h00004))
usr_signature[63:32] <= regi_payload;
else if (regi_addr_local == (PCIE_FPGA_USR_SIG_REG_ADDR + 20'h00008))
usr_signature[95:64] <= regi_payload;
else if (regi_addr_local == (PCIE_FPGA_USR_SIG_REG_ADDR + 20'h0000C))
usr_signature[127:96] <= regi_payload;
end
always @(*) begin
case (regi_addr_local)
PCIE_FPGA_SIG_REG_ADDR: rego_payload = PCIE_FPGA_SIG_VAL;
PCIE_FPGA_COUNTER_LO_REG_ADDR: rego_payload = bus_counter[31:0];
PCIE_FPGA_COUNTER_HI_REG_ADDR: rego_payload = bus_counter[63:32];
PCIE_FPGA_COUNTER_FREQ_ADDR: rego_payload = PCIE_FPGA_COUNTER_FREQ;
PCIE_FPGA_SCRATCH0_ADDR: rego_payload = scratch[31:0];
PCIE_FPGA_SCRATCH1_ADDR: rego_payload = scratch[63:32];
PCIE_FPGA_MISC_STATUS_ADDR: rego_payload = misc_status;
PCIE_FPGA_USR_SIG_REG_ADDR + 20'h00000: rego_payload = usr_signature[31:0];
PCIE_FPGA_USR_SIG_REG_ADDR + 20'h00004: rego_payload = usr_signature[63:32];
PCIE_FPGA_USR_SIG_REG_ADDR + 20'h00008: rego_payload = usr_signature[95:64];
PCIE_FPGA_USR_SIG_REG_ADDR + 20'h0000C: rego_payload = usr_signature[127:96];
default: rego_payload = 32'hFFFFFFFF;
endcase
end
endmodule
|
