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[/] [robust_axi_fabric/] [trunk/] [src/] [gen/] [prgen_fifo.v] - Rev 2
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OUTFILE prgen_fifo.v module prgen_fifo(PORTS); parameter WIDTH = 8; parameter DEPTH_FULL = 8; parameter SINGLE = DEPTH_FULL == 1; parameter DEPTH = SINGLE ? 1 : DEPTH_FULL -1; parameter DEPTH_BITS = (DEPTH <= 2) ? 1 : (DEPTH <= 4) ? 2 : (DEPTH <= 8) ? 3 : (DEPTH <= 16) ? 4 : (DEPTH <= 32) ? 5 : (DEPTH <= 64) ? 6 : (DEPTH <= 128) ? 7 : (DEPTH <= 256) ? 8 : 0; //0 is ilegal parameter LAST_LINE = DEPTH-1; input clk; input reset; input push; input pop; input [WIDTH-1:0] din; output [WIDTH-1:0] dout; //output next; output empty; output full; wire reg_push; wire reg_pop; wire fifo_push; wire fifo_pop; reg [DEPTH-1:0] fullness_in; reg [DEPTH-1:0] fullness_out; reg [DEPTH-1:0] fullness; reg [WIDTH-1:0] fifo [DEPTH-1:0]; wire fifo_empty; wire next; reg [WIDTH-1:0] dout; reg dout_empty; reg [DEPTH_BITS-1:0] ptr_in; reg [DEPTH_BITS-1:0] ptr_out; assign reg_push = push & fifo_empty & (dout_empty | pop); assign reg_pop = pop & fifo_empty; assign fifo_push = !SINGLE & push & (~reg_push); assign fifo_pop = !SINGLE & pop & (~reg_pop); always @(posedge clk or posedge reset) if (reset) begin dout <= #FFD {WIDTH{1'b0}}; dout_empty <= #FFD 1'b1; end else if (reg_push) begin dout <= #FFD din; dout_empty <= #FFD 1'b0; end else if (reg_pop) begin dout <= #FFD {WIDTH{1'b0}}; dout_empty <= #FFD 1'b1; end else if (fifo_pop) begin dout <= #FFD fifo[ptr_out]; dout_empty <= #FFD 1'b0; end always @(posedge clk or posedge reset) if (reset) ptr_in <= #FFD {DEPTH_BITS{1'b0}}; else if (fifo_push) ptr_in <= #FFD ptr_in == LAST_LINE ? 0 : ptr_in + 1'b1; always @(posedge clk or posedge reset) if (reset) ptr_out <= #FFD {DEPTH_BITS{1'b0}}; else if (fifo_pop) ptr_out <= #FFD ptr_out == LAST_LINE ? 0 : ptr_out + 1'b1; always @(posedge clk) if (fifo_push) fifo[ptr_in] <= #FFD din; always @(/*AUTOSENSE*/fifo_push or ptr_in) begin fullness_in = {DEPTH{1'b0}}; fullness_in[ptr_in] = fifo_push; end always @(/*AUTOSENSE*/fifo_pop or ptr_out) begin fullness_out = {DEPTH{1'b0}}; fullness_out[ptr_out] = fifo_pop; end always @(posedge clk or posedge reset) if (reset) fullness <= #FFD {DEPTH{1'b0}}; else if (fifo_push | fifo_pop) fullness <= #FFD (fullness & (~fullness_out)) | fullness_in; assign next = |fullness; assign fifo_empty = ~next; assign empty = fifo_empty & dout_empty; assign full = SINGLE ? !dout_empty : &fullness; endmodule
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