rtl/gfx: implement skid buffers

1 files changed, 9 insertions, 3 deletions

diff --git a/rtl/gfx/fold_flow.sv b/rtl/gfx/fold_flow.sv
index 718786e..1d9c0f2 100644
--- a/rtl/gfx/fold_flow.sv
+++ b/rtl/gfx/fold_flow.sv
@@ -15,17 +15,23 @@ module fold_flow
 	              feedback_last
 );
 
+	logic skid_ready;
 	index4 rounds[`FP_ADD_STAGES], last_round;
 
-	assign stall = out_valid && !out_ready;
-	assign in_ready = !stall && !feedback;
-	assign out_valid = last_round == `INDEX4_MAX;
+	assign in_ready = skid_ready && !feedback;
 
 	assign feedback = last_round[1] ^ last_round[0];
 	assign feedback_last = last_round[1];
 
 	assign last_round = rounds[`FP_ADD_STAGES - 1];
 
+	skid_flow skid
+	(
+		.in_valid(last_round == `INDEX4_MAX),
+		.in_ready(skid_ready),
+		.*
+	);
+
 	always_ff @(posedge clk or negedge rst_n)
 		if (!rst_n)
 			rounds[0] <= `INDEX4_MIN;