rtl/gfx: implement non-synthesizable matrix multiplier

1 files changed, 40 insertions, 0 deletions

diff --git a/rtl/gfx/gfx.sv b/rtl/gfx/gfx.sv
new file mode 100644
index 0000000..ab2bcce
--- /dev/null
+++ b/rtl/gfx/gfx.sv
@@ -0,0 +1,40 @@
+`include "gfx/gfx_defs.sv"
+
+module gfx
+(
+	input  logic       clk,
+	                   rst_n,
+
+	input  logic[4:0]  cmd_address,
+	input  logic       cmd_read,
+	                   cmd_write,
+	input  logic[31:0] cmd_writedata,
+	output logic[31:0] cmd_readdata
+);
+
+	mat4 a, b, q, hold_q;
+	logic start, done;
+
+	assign cmd_readdata = hold_q[cmd_address[3:2]][cmd_address[1:0]];
+
+	mat_mat_mul mul
+	(
+		.*
+	);
+
+	always_ff @(posedge clk) begin
+		if (cmd_write) begin
+			if (cmd_address[4])
+				a[cmd_address[3:2]][cmd_address[1:0]] <= cmd_writedata;
+			else
+				b[cmd_address[3:2]][cmd_address[1:0]] <= cmd_writedata;
+		end
+
+		if (done)
+			hold_q <= q;
+	end
+
+	always_ff @(posedge clk or negedge rst_n)
+		start <= !rst_n ? 0 : (cmd_write && cmd_address == 5'b11111);
+
+endmodule