+++ /dev/null
-module cmd_reader
- (//System
- input reset, input txclk, input [31:0] timestamp_clock,
- //FX2 Side
- output reg skip, output reg rdreq,
- input [31:0] fifodata, input pkt_waiting,
- //Rx side
- input rx_WR_enabled, output reg [15:0] rx_databus,
- output reg rx_WR, output reg rx_WR_done,
- //register io
- input wire [31:0] reg_data_out, output reg [31:0] reg_data_in,
- output reg [6:0] reg_addr, output reg [1:0] reg_io_enable,
- output wire [14:0] debug, output reg stop, output reg [15:0] stop_time);
-
- // States
- parameter IDLE = 4'd0;
- parameter HEADER = 4'd1;
- parameter TIMESTAMP = 4'd2;
- parameter WAIT = 4'd3;
- parameter TEST = 4'd4;
- parameter SEND = 4'd5;
- parameter PING = 4'd6;
- parameter WRITE_REG = 4'd7;
- parameter WRITE_REG_MASKED = 4'd8;
- parameter READ_REG = 4'd9;
- parameter DELAY = 4'd14;
-
- `define OP_PING_FIXED 8'd0
- `define OP_PING_FIXED_REPLY 8'd1
- `define OP_WRITE_REG 8'd2
- `define OP_WRITE_REG_MASKED 8'd3
- `define OP_READ_REG 8'd4
- `define OP_READ_REG_REPLY 8'd5
- `define OP_DELAY 8'd12
-
- reg [6:0] payload;
- reg [6:0] payload_read;
- reg [3:0] state;
- reg [15:0] high;
- reg [15:0] low;
- reg pending;
- reg [31:0] value0;
- reg [31:0] value1;
- reg [31:0] value2;
- reg [1:0] lines_in;
- reg [1:0] lines_out;
- reg [1:0] lines_out_total;
-
- `define JITTER 5
- `define OP_CODE 31:24
- `define PAYLOAD 8:2
-
- wire [7:0] ops;
- assign ops = value0[`OP_CODE];
- assign debug = {state[3:0], lines_out[1:0], pending, rx_WR, rx_WR_enabled, value0[2:0], ops[2:0]};
-
- always @(posedge txclk)
- if (reset)
- begin
- pending <= 0;
- state <= IDLE;
- skip <= 0;
- rdreq <= 0;
- rx_WR <= 0;
- reg_io_enable <= 0;
- reg_data_in <= 0;
- reg_addr <= 0;
- stop <= 0;
- end
- else case (state)
- IDLE :
- begin
- payload_read <= 0;
- skip <= 0;
- lines_in <= 0;
- if(pkt_waiting)
- begin
- state <= HEADER;
- rdreq <= 1;
- end
- end
-
- HEADER :
- begin
- payload <= fifodata[`PAYLOAD];
- state <= TIMESTAMP;
- end
-
- TIMESTAMP :
- begin
- value0 <= fifodata;
- state <= WAIT;
- rdreq <= 0;
- end
-
- WAIT :
- begin
- // Let's send it
- if ((value0 <= timestamp_clock + `JITTER
- && value0 > timestamp_clock)
- || value0 == 32'hFFFFFFFF)
- state <= TEST;
- // Wait a little bit more
- else if (value0 > timestamp_clock + `JITTER)
- state <= WAIT;
- // Outdated
- else if (value0 < timestamp_clock)
- begin
- state <= IDLE;
- skip <= 1;
- end
- end
-
- TEST :
- begin
- reg_io_enable <= 0;
- rx_WR <= 0;
- rx_WR_done <= 1;
- stop <= 0;
- if (payload_read == payload)
- begin
- skip <= 1;
- state <= IDLE;
- rdreq <= 0;
- end
- else
- begin
- value0 <= fifodata;
- lines_in <= 2'd1;
- rdreq <= 1;
- payload_read <= payload_read + 7'd1;
- lines_out <= 0;
- case (fifodata[`OP_CODE])
- `OP_PING_FIXED:
- begin
- state <= PING;
- end
- `OP_WRITE_REG:
- begin
- state <= WRITE_REG;
- pending <= 1;
- end
- `OP_WRITE_REG_MASKED:
- begin
- state <= WRITE_REG_MASKED;
- pending <= 1;
- end
- `OP_READ_REG:
- begin
- state <= READ_REG;
- end
- `OP_DELAY:
- begin
- state <= DELAY;
- end
- default:
- begin
- //error, skip this packet
- skip <= 1;
- state <= IDLE;
- end
- endcase
- end
- end
-
- SEND:
- begin
- rdreq <= 0;
- rx_WR_done <= 0;
- if (pending)
- begin
- rx_WR <= 1;
- rx_databus <= high;
- pending <= 0;
- if (lines_out == lines_out_total)
- state <= TEST;
- else case (ops)
- `OP_READ_REG:
- begin
- state <= READ_REG;
- end
- default:
- begin
- state <= TEST;
- end
- endcase
- end
- else
- begin
- if (rx_WR_enabled)
- begin
- rx_WR <= 1;
- rx_databus <= low;
- pending <= 1;
- lines_out <= lines_out + 2'd1;
- end
- else
- rx_WR <= 0;
- end
- end
-
- PING:
- begin
- rx_WR <= 0;
- rdreq <= 0;
- rx_WR_done <= 0;
- lines_out_total <= 2'd1;
- pending <= 0;
- state <= SEND;
- high <= {`OP_PING_FIXED_REPLY, 8'd2};
- low <= value0[15:0];
- end
-
- READ_REG:
- begin
- rx_WR <= 0;
- rx_WR_done <= 0;
- rdreq <= 0;
- lines_out_total <= 2'd2;
- pending <= 0;
- state <= SEND;
- if (lines_out == 0)
- begin
- high <= {`OP_READ_REG_REPLY, 8'd6};
- low <= value0[15:0];
- reg_io_enable <= 2'd3;
- reg_addr <= value0[6:0];
- end
- else
- begin
- high <= reg_data_out[31:16];
- low <= reg_data_out[15:0];
- end
- end
-
- WRITE_REG:
- begin
- rx_WR <= 0;
- if (pending)
- pending <= 0;
- else
- begin
- if (lines_in == 2'd1)
- begin
- payload_read <= payload_read + 7'd1;
- lines_in <= lines_in + 2'd1;
- value1 <= fifodata;
- rdreq <= 0;
- end
- else
- begin
- reg_io_enable <= 2'd2;
- reg_data_in <= value1;
- reg_addr <= value0[6:0];
- state <= TEST;
- end
- end
- end
-
- WRITE_REG_MASKED:
- begin
- rx_WR <= 0;
- if (pending)
- pending <= 0;
- else
- begin
- if (lines_in == 2'd1)
- begin
- rdreq <= 1;
- payload_read <= payload_read + 7'd1;
- lines_in <= lines_in + 2'd1;
- value1 <= fifodata;
- end
- else if (lines_in == 2'd2)
- begin
- rdreq <= 0;
- payload_read <= payload_read + 7'd1;
- lines_in <= lines_in + 2'd1;
- value2 <= fifodata;
- end
- else
- begin
- reg_io_enable <= 2'd2;
- reg_data_in <= (value1 & value2);
- reg_addr <= value0[6:0];
- state <= TEST;
- end
- end
- end
-
- DELAY :
- begin
- rdreq <= 0;
- stop <= 1;
- stop_time <= value0[15:0];
- state <= TEST;
- end
-
- default :
- begin
- //error state handling
- state <= IDLE;
- end
- endcase
-endmodule
projects / debian / gnuradio / blobdiff