platform/wavelet3d: add sched debug agent

1 files changed, 50 insertions, 0 deletions

diff --git a/platform/wavelet3d/gfx_sim_debug.sv b/platform/wavelet3d/gfx_sim_debug.sv
new file mode 100644
index 0000000..4b4622a
--- /dev/null
+++ b/platform/wavelet3d/gfx_sim_debug.sv
@@ -0,0 +1,50 @@
+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