examples: Add udp usp gth sgmii example.

examples/udp_usp_gth_sgmii.yml

@@ -0,0 +1,24 @@
+#
+# This file is part of LiteEth.
+#
+# Copyright (c) 2020-2023 Florent Kermarrec <florent@enjoy-digital.fr>
+# SPDX-License-Identifier: BSD-2-Clause
+
+# PHY ----------------------------------------------------------------------
+phy:          USP_GTH_1000BASEX
+vendor:       xilinx
+toolchain:    vivado
+
+# Core ---------------------------------------------------------------------
+clk_freq:    125e6
+core:        udp
+data_width:  32
+
+# UDP Ports --------------------------------------------------------------------
+udp_ports:   {
+  "udp0": {
+    "data_width"    : 32,
+    "tx_fifo_depth" : 1024,
+    "rx_fifo_depth" : 1024,
+  },
+}