59 lines
1.7 KiB
Systemverilog
59 lines
1.7 KiB
Systemverilog
|
//---------------------------------------------------------------------------------------
|
||
|
|
// filename: cmd_line_buffer.sv
|
||
|
|
// description: command line buffer
|
||
|
|
// author: leguoqing@paisat.cn
|
||
|
|
//---------------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
module cmd_line_buffer
|
||
|
|
#(
|
||
|
|
parameter MODULE_FREQ_HZ = 50,
|
||
|
|
parameter BUF_SIZE = 4096,
|
||
|
|
parameter MAX_LINE_LEN = 256
|
||
|
|
)(
|
||
|
|
input logic clk,
|
||
|
|
input logic resetn,
|
||
|
|
|
||
|
|
// interface to byte stream of CLI
|
||
|
|
input logic byte_in_valid,
|
||
|
|
input logic [7:0] byte_in_data,
|
||
|
|
output logic byte_in_ready,
|
||
|
|
|
||
|
|
output logic byte_out_valid,
|
||
|
|
output logic [7:0] byte_out_data,
|
||
|
|
input logic byte_out_ready,
|
||
|
|
|
||
|
|
// interface to cli2axil
|
||
|
|
input logic from_cli_valid,
|
||
|
|
input logic [7:0] from_cli_data,
|
||
|
|
output logic from_cli_ready,
|
||
|
|
|
||
|
|
output logic to_cli_valid,
|
||
|
|
output logic [7:0] to_cli_data,
|
||
|
|
output logic to_cli_last,
|
||
|
|
input logic to_cli_ready
|
||
|
|
|
||
|
|
);
|
||
|
|
|
||
|
|
localparam integer MODULE_FREQ_MHZ = MODULE_FREQ_HZ / 1e6;
|
||
|
|
localparam integer MAX_LINE_CNT = BUF_SIZE / MAX_LINE_LEN;
|
||
|
|
localparam integer PTR_WIDTH = $clog2(BUF_SIZE);
|
||
|
|
localparam integer LINE_LEN_WIDTH = $clog2(MAX_LINE_LEN);
|
||
|
|
localparam integer LINE_CNT_WIDTH = $clog2(MAX_LINE_CNT);
|
||
|
|
|
||
|
|
|
||
|
|
// RX buffer
|
||
|
|
logic [7:0] rx_buffer [0:BUF_SIZE-1];
|
||
|
|
|
||
|
|
logic
|
||
|
|
|
||
|
|
logic [PTR_WIDTH-1:0] wr_ptr;
|
||
|
|
logic [PTR_WIDTH-1:0] rd_ptr;
|
||
|
|
|
||
|
|
logic [LINE_CNT_WIDTH:0] wr_idx;
|
||
|
|
logic [LINE_CNT_WIDTH:0] rd_idx;
|
||
|
|
logic [LINE_CNT_WIDTH:0] history_idx;
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
endmodule
|