Initial commit of files

SoftwareDefined/HackRF/hackrf-2015.07.2/firmware/cpld/sgpio_if_passthrough/top.vhd

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+--
+-- Copyright 2012 Jared Boone
+--
+-- This file is part of HackRF.
+--
+-- This program is free software; you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation; either version 2, or (at your option)
+-- any later version.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+--
+-- You should have received a copy of the GNU General Public License
+-- along with this program; see the file COPYING.  If not, write to
+-- the Free Software Foundation, Inc., 51 Franklin Street,
+-- Boston, MA 02110-1301, USA.
+
+library IEEE;
+use IEEE.STD_LOGIC_1164.ALL;
+
+library UNISIM;
+use UNISIM.vcomponents.all;
+
+entity top is
+    Port(
+        SGPIO           : inout std_logic_vector(15 downto 0);
+           
+        DA              : in    std_logic_vector(7 downto 0);
+        DD              : out   std_logic_vector(9 downto 0);
+
+        CODEC_CLK       : in    std_logic;
+        CODEC_X2_CLK    : in    std_logic;
+           
+        B1AUX           : in    std_logic_vector(16 downto 9);
+        B2AUX           : inout std_logic_vector(16 downto 1)
+    );
+
+end top;
+
+architecture Behavioral of top is
+    type transfer_direction is (to_sgpio, from_sgpio);
+    signal transfer_direction_i : transfer_direction;
+
+begin
+    
+    transfer_direction_i <= to_sgpio when B1AUX(9) = '0'
+                                     else from_sgpio;
+
+    DD <= (DD'high => '1', others => '0');
+    
+    B2AUX <= SGPIO when transfer_direction_i = from_sgpio
+                   else (others => 'Z');
+
+    SGPIO <= B2AUX when transfer_direction_i = to_sgpio
+                   else (others => 'Z');
+    
+end Behavioral;