From 1e064f29139a45061a8082914e9ee75c15e803a4 Mon Sep 17 00:00:00 2001
From: Alejandro Soto <alejandro@34project.org>
Date: Wed, 22 Nov 2023 01:24:41 -0600
Subject: rtl/gfx: implement fp->fixed conversion

---
 rtl/gfx/gfx_defs.sv   |  2 +-
 rtl/gfx/gfx_fp_fix.sv | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+), 1 deletion(-)
 create mode 100644 rtl/gfx/gfx_fp_fix.sv

(limited to 'rtl')

diff --git a/rtl/gfx/gfx_defs.sv b/rtl/gfx/gfx_defs.sv
index d95414a..913cb85 100644
--- a/rtl/gfx/gfx_defs.sv
+++ b/rtl/gfx/gfx_defs.sv
@@ -9,7 +9,7 @@
 // Target de 200MHz (reloj es 143MHz) con float16, rounding (muy) aproximado
 `define FP_ADD_STAGES 10 // ~401 LUTs
 `define FP_MUL_STAGES 5  // ~144 LUTs ~1 bloque DSP
-`define FP_INV_STAGES 3  // ~178 LUTs ~1 bloque DSP
+`define FP_FIX_STAGES 5  // ~345 LUTs
 
 typedef logic[`FLOAT_BITS - 1:0]  fp;
 typedef fp[1:0]                   vec2;
diff --git a/rtl/gfx/gfx_fp_fix.sv b/rtl/gfx/gfx_fp_fix.sv
new file mode 100644
index 0000000..b38e0e3
--- /dev/null
+++ b/rtl/gfx/gfx_fp_fix.sv
@@ -0,0 +1,34 @@
+`include "gfx/gfx_defs.sv"
+
+module gfx_fp_fix
+(
+	input  logic clk,
+
+	input  fp    in,
+	input  logic stall,
+
+	output fixed out
+);
+
+`ifndef VERILATOR
+	ip_fp_fix ip_fix
+	(
+		.a(in),
+		.q(out),
+		.en(!stall),
+		.areset(0),
+		.*
+	);
+`else
+	fp pop;
+
+	assign out = $c("taller::fp_fix(", pop, ")");
+
+	gfx_pipes #(.WIDTH($bits(in)), .DEPTH(`FP_FIX_STAGES)) pipes
+	(
+		.out(pop),
+		.*
+	);
+`endif
+
+endmodule
-- 
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