fpga: x400: zbx: Add support for ZBX CPLD

Co-authored-by: Cherwa Vang <cherwa.vang@ni.com>
Co-authored-by: Martin Braun <martin.braun@ettus.com>
Co-authored-by: Max Köhler <max.koehler@ni.com>
Co-authored-by: Paul Butler <paul.butler@ni.com>


Original-commit: 99b841c75aa91709090cbf4046bf51b7ffb4f612

top/x400/dboards/zbx/cpld/ctrlport_window.v

@@ -0,0 +1,73 @@
+//
+// Copyright 2021 Ettus Research, a National Instruments Brand
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+//
+// Module: ctrlport_window
+//
+// Description:
+//   Copy requests from slave to master interface when s_ctrlport_req_addr is in
+//   address range specified by BASE_ADDRESS and WINDOW_SIZE. The modules does
+//   not use any registers and therefore does not need ctrlport_clk and
+//   ctrlport_rst.
+//
+
+`default_nettype none
+
+module ctrlport_window #(
+  parameter BASE_ADDRESS = 0,
+  parameter WINDOW_SIZE  = 32
+) (
+  // Slave Interface
+  input  wire        s_ctrlport_req_wr,
+  input  wire        s_ctrlport_req_rd,
+  input  wire [19:0] s_ctrlport_req_addr,
+  input  wire [ 9:0] s_ctrlport_req_portid,
+  input  wire [15:0] s_ctrlport_req_rem_epid,
+  input  wire [ 9:0] s_ctrlport_req_rem_portid,
+  input  wire [31:0] s_ctrlport_req_data,
+  input  wire [ 3:0] s_ctrlport_req_byte_en,
+  input  wire        s_ctrlport_req_has_time,
+  input  wire [63:0] s_ctrlport_req_time,
+  output wire        s_ctrlport_resp_ack,
+  output wire [ 1:0] s_ctrlport_resp_status,
+  output wire [31:0] s_ctrlport_resp_data,
+
+  // Master Interface
+  output wire        m_ctrlport_req_wr,
+  output wire        m_ctrlport_req_rd,
+  output wire [19:0] m_ctrlport_req_addr,
+  output wire [ 9:0] m_ctrlport_req_portid,
+  output wire [15:0] m_ctrlport_req_rem_epid,
+  output wire [ 9:0] m_ctrlport_req_rem_portid,
+  output wire [31:0] m_ctrlport_req_data,
+  output wire [ 3:0] m_ctrlport_req_byte_en,
+  output wire        m_ctrlport_req_has_time,
+  output wire [63:0] m_ctrlport_req_time,
+  input  wire        m_ctrlport_resp_ack,
+  input  wire [ 1:0] m_ctrlport_resp_status,
+  input  wire [31:0] m_ctrlport_resp_data
+);
+
+  // Mask write and read flag
+  wire address_in_range = (s_ctrlport_req_addr >= BASE_ADDRESS) && (s_ctrlport_req_addr < BASE_ADDRESS + WINDOW_SIZE);
+  assign m_ctrlport_req_wr = s_ctrlport_req_wr & address_in_range;
+  assign m_ctrlport_req_rd = s_ctrlport_req_rd & address_in_range;
+
+  // Forward all other signals untouched.
+  assign m_ctrlport_req_addr       = s_ctrlport_req_addr;
+  assign m_ctrlport_req_portid     = s_ctrlport_req_portid;
+  assign m_ctrlport_req_rem_epid   = s_ctrlport_req_rem_epid;
+  assign m_ctrlport_req_rem_portid = s_ctrlport_req_rem_portid;
+  assign m_ctrlport_req_data       = s_ctrlport_req_data;
+  assign m_ctrlport_req_byte_en    = s_ctrlport_req_byte_en;
+  assign m_ctrlport_req_has_time   = s_ctrlport_req_has_time;
+  assign m_ctrlport_req_time       = s_ctrlport_req_time;
+
+  assign s_ctrlport_resp_ack    = m_ctrlport_resp_ack;
+  assign s_ctrlport_resp_status = m_ctrlport_resp_status;
+  assign s_ctrlport_resp_data   = m_ctrlport_resp_data;
+
+endmodule
+
+`default_nettype wire