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module gfx_sim_debug
import gfx::*;
(
input logic clk,
rst_n,
gfx_axil.s axis
);
enum int unsigned
{
INPUT,
STALL
} state;
assign axis.rvalid = 0;
assign axis.arready = 0;
assign axis.awready = 1;
always_comb
unique case (state)
INPUT: begin
axis.wready = 1;
axis.bvalid = axis.wvalid;
end
STALL: begin
axis.wready = 0;
axis.bvalid = 1;
end
endcase
always_ff @(posedge clk or negedge rst_n)
if (~rst_n)
state <= INPUT;
else
unique case (state)
INPUT:
if (axis.wvalid) begin
$display("%c", axis.wdata[7:0]);
if (~axis.bready)
state <= STALL;
end
STALL:
if (axis.bready)
state <= INPUT;
endcase
endmodule
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