Модуль генерации сигнала от частоты. Можно юзать на светодиоде от разных модулей и ip ядер (например от mac или pcie), как индикатор правильной инициализации.
heart_beat.sv
heart_beat_tb.sv
heart_beat.sv
Код
#SV
`timescale 1ns / 10ps
module heart_beat #
(
parameter integer SPEED_GRADE = 2,
parameter IS_DEBUG = "false",
parameter IS_BLINK = "false"
)
(
input logic i_clk,
input logic i_s_rst_n,
output logic o_heart_beat
);
localparam integer RATE = (IS_DEBUG == "true") ? 120 : 120_000_000;
localparam integer MAX_COUNTER_VAL = RATE / (((SPEED_GRADE != 2 ) &&
(SPEED_GRADE != 3 ) &&
(SPEED_GRADE != 5 ) &&
(SPEED_GRADE != 6 )) ? 2 : SPEED_GRADE);
localparam integer COUNTER_WIDTH = $clog2(MAX_COUNTER_VAL);
localparam [COUNTER_WIDTH - 1: 0] CMP_COUNTER_VAL = MAX_COUNTER_VAL - 1'h1;
logic heart_beat;
logic mask;
logic [COUNTER_WIDTH - 1: 0] counter;
assign o_heart_beat = heart_beat & ((IS_BLINK == "true") ? '1 : mask);
always_ff @ (posedge i_clk) begin
if (i_s_rst_n == '0) begin
counter <= '0;
heart_beat <= '0;
end
else begin
if (counter == CMP_COUNTER_VAL) begin
heart_beat <= !heart_beat;
counter <= '0;
end
else begin
counter++;
end
end
end
generate
if (IS_BLINK == "false") begin
localparam integer MASK_COUNTER_PRE = 4;
localparam integer MASK_MAX_COUNTER_VAL = (MAX_COUNTER_VAL / MASK_COUNTER_PRE);
localparam integer MASK_COUNTER_WIDTH = $clog2(MASK_MAX_COUNTER_VAL);
localparam [COUNTER_WIDTH - 1: 0] MASK_CMP_COUNTER_VAL = MASK_MAX_COUNTER_VAL - 1'h1;
logic [MASK_COUNTER_WIDTH - 1: 0] mask_counter;
always_ff @ (posedge i_clk) begin
if (i_s_rst_n == '0) begin
mask <= '0;
mask_counter <= '0;
end
else begin
if (mask_counter == MASK_CMP_COUNTER_VAL) begin
mask <= !mask;
mask_counter <= '0;
end
else begin
mask_counter++;
end
end
end
end
endgenerate
endmodule
`timescale 1ns / 10ps
module heart_beat #
(
parameter integer SPEED_GRADE = 2,
parameter IS_DEBUG = "false",
parameter IS_BLINK = "false"
)
(
input logic i_clk,
input logic i_s_rst_n,
output logic o_heart_beat
);
localparam integer RATE = (IS_DEBUG == "true") ? 120 : 120_000_000;
localparam integer MAX_COUNTER_VAL = RATE / (((SPEED_GRADE != 2 ) &&
(SPEED_GRADE != 3 ) &&
(SPEED_GRADE != 5 ) &&
(SPEED_GRADE != 6 )) ? 2 : SPEED_GRADE);
localparam integer COUNTER_WIDTH = $clog2(MAX_COUNTER_VAL);
localparam [COUNTER_WIDTH - 1: 0] CMP_COUNTER_VAL = MAX_COUNTER_VAL - 1'h1;
logic heart_beat;
logic mask;
logic [COUNTER_WIDTH - 1: 0] counter;
assign o_heart_beat = heart_beat & ((IS_BLINK == "true") ? '1 : mask);
always_ff @ (posedge i_clk) begin
if (i_s_rst_n == '0) begin
counter <= '0;
heart_beat <= '0;
end
else begin
if (counter == CMP_COUNTER_VAL) begin
heart_beat <= !heart_beat;
counter <= '0;
end
else begin
counter++;
end
end
end
generate
if (IS_BLINK == "false") begin
localparam integer MASK_COUNTER_PRE = 4;
localparam integer MASK_MAX_COUNTER_VAL = (MAX_COUNTER_VAL / MASK_COUNTER_PRE);
localparam integer MASK_COUNTER_WIDTH = $clog2(MASK_MAX_COUNTER_VAL);
localparam [COUNTER_WIDTH - 1: 0] MASK_CMP_COUNTER_VAL = MASK_MAX_COUNTER_VAL - 1'h1;
logic [MASK_COUNTER_WIDTH - 1: 0] mask_counter;
always_ff @ (posedge i_clk) begin
if (i_s_rst_n == '0) begin
mask <= '0;
mask_counter <= '0;
end
else begin
if (mask_counter == MASK_CMP_COUNTER_VAL) begin
mask <= !mask;
mask_counter <= '0;
end
else begin
mask_counter++;
end
end
end
end
endgenerate
endmodule
heart_beat_tb.sv
Код
#SV
module heart_beat_tb;
//-------------------------------------------------- setup
localparam integer SPEED_GRADE = 2;
localparam IS_DEBUG = "true";
localparam IS_BLINK = "true";
localparam integer ITERATION = 1000;
//-------------------------------------------------- end setup
localparam integer CLOCK_PERIOD = 120;
localparam integer MAX_COUNTER_VAL = CLOCK_PERIOD - 1;
localparam integer TEST_ITERATION = ITERATION * MAX_COUNTER_VAL;
bit clk = '0;
bit s_rst_n = '1;
bit heart_beat = '0;
integer counter = 0;
heart_beat #
(
.SPEED_GRADE (SPEED_GRADE ),
.IS_DEBUG (IS_DEBUG ),
.IS_BLINK (IS_BLINK )
)
heart_beat_dut
(
.i_clk (clk ),
.i_s_rst_n (s_rst_n ),
.o_heart_beat (heart_beat)
);
always begin
#(CLOCK_PERIOD / 2) clk = !clk;
end
initial begin
s_rst_n <= '0;
@(posedge clk);
s_rst_n <= '1;
@(posedge clk);
repeat(TEST_ITERATION) begin
if (counter == MAX_COUNTER_VAL) begin
counter = 0;
end
else begin
counter++;
end
@(posedge clk);
end
$stop();
end
endmodule
module heart_beat_tb;
//-------------------------------------------------- setup
localparam integer SPEED_GRADE = 2;
localparam IS_DEBUG = "true";
localparam IS_BLINK = "true";
localparam integer ITERATION = 1000;
//-------------------------------------------------- end setup
localparam integer CLOCK_PERIOD = 120;
localparam integer MAX_COUNTER_VAL = CLOCK_PERIOD - 1;
localparam integer TEST_ITERATION = ITERATION * MAX_COUNTER_VAL;
bit clk = '0;
bit s_rst_n = '1;
bit heart_beat = '0;
integer counter = 0;
heart_beat #
(
.SPEED_GRADE (SPEED_GRADE ),
.IS_DEBUG (IS_DEBUG ),
.IS_BLINK (IS_BLINK )
)
heart_beat_dut
(
.i_clk (clk ),
.i_s_rst_n (s_rst_n ),
.o_heart_beat (heart_beat)
);
always begin
#(CLOCK_PERIOD / 2) clk = !clk;
end
initial begin
s_rst_n <= '0;
@(posedge clk);
s_rst_n <= '1;
@(posedge clk);
repeat(TEST_ITERATION) begin
if (counter == MAX_COUNTER_VAL) begin
counter = 0;
end
else begin
counter++;
end
@(posedge clk);
end
$stop();
end
endmodule
