rfnoc: lib: introduce ctrl-port interface and BFM

Original-commit: 886cf97ad5d494b20c6fff0a53113f6096d458c7

lib/rfnoc/utils/ctrlport_if_terminator.sv

@@ -0,0 +1,44 @@
+//
+// Copyright 2025 Ettus Research, a National Instruments Brand
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+//
+// Module: ctrlport_if_terminator
+//
+// Description:
+//
+//   Returns an error for all ctrlport requests in given address range.
+//
+// Parameters:
+//
+//  BASE_ADDRESS : First address to generate response for.
+//  WINDOW_SIZE  : Size of the address space.
+//                 Last address in range will be BASE_ADDRESS + WINDOW_SIZE - 1.
+//
+
+module ctrlport_if_terminator #(
+  int BASE_ADDRESS = 0,
+  int WINDOW_SIZE  = 32
+)(
+  ctrlport_if.slave s_ctrlport
+);
+
+  import ctrlport_pkg::*;
+
+  // drive acknowledgement on requests but not on reset
+  always_ff @(posedge s_ctrlport.clk) begin
+    if (s_ctrlport.rst) begin
+      s_ctrlport.resp.ack <= 1'b0;
+    end else if ((s_ctrlport.req.addr >= BASE_ADDRESS) &&
+      (s_ctrlport.req.addr < BASE_ADDRESS + WINDOW_SIZE)) begin
+      s_ctrlport.resp.ack <= s_ctrlport.req.wr | s_ctrlport.req.rd;
+    end else begin
+      s_ctrlport.resp.ack <= 1'b0;
+    end
+  end
+
+  // other outputs are fixed
+  assign s_ctrlport.resp.status = STS_CMDERR;
+  assign s_ctrlport.resp.data = '0;
+
+endmodule