verilog/rtl/ips/axi/axi_spi_slave/spi_slave_rx.v

module spi_slave_rx (
	sclk,
	cs,
	sdi0,
	sdi1,
	sdi2,
	sdi3,
	en_quad_in,
	counter_in,
	counter_in_upd,
	data,
	data_ready
);
	input wire sclk;
	input wire cs;
	input wire sdi0;
	input wire sdi1;
	input wire sdi2;
	input wire sdi3;
	input wire en_quad_in;
	input wire [7:0] counter_in;
	input wire counter_in_upd;
	output wire [31:0] data;
	output reg data_ready;
	reg [31:0] data_int;
	reg [31:0] data_int_next;
	reg [7:0] counter;
	reg [7:0] counter_trgt;
	reg [7:0] counter_next;
	reg [7:0] counter_trgt_next;
	reg running;
	reg running_next;
	assign data = data_int_next;
	always @(*) begin
		if (counter_in_upd)
			counter_trgt_next = counter_in;
		else if ((counter_trgt == 8'h01) && !en_quad_in)
			counter_trgt_next = 8'h07;
		else
			counter_trgt_next = counter_trgt;
		if (counter_in_upd)
			running_next = 1'b1;
		else if (counter == counter_trgt)
			running_next = 1'b0;
		else
			running_next = running;
		if (running) begin
			if (counter == counter_trgt) begin
				counter_next = 'h0;
				data_ready = 1'b1;
			end
			else begin
				counter_next = counter + 1;
				data_ready = 1'b0;
			end
			if (en_quad_in)
				data_int_next = {data_int[27:0], sdi3, sdi2, sdi1, sdi0};
			else
				data_int_next = {data_int[30:0], sdi0};
		end
		else begin
			counter_next = counter;
			data_ready = 1'b0;
			data_int_next = data_int;
		end
	end
	always @(posedge sclk or posedge cs)
		if (cs == 1'b1) begin
			counter <= 0;
			counter_trgt <= 'h1;
			data_int <= 'h0;
			running <= 'h1;
		end
		else begin
			counter <= counter_next;
			counter_trgt <= counter_trgt_next;
			data_int <= data_int_next;
			running <= running_next;
		end
endmodule