+-- `Deep Thought', a softcore CPU implemented on a FPGA
+--
+-- Copyright (C) 2010 Markus Hofstaetter <markus.manrow@gmx.at>
+-- Copyright (C) 2010 Martin Perner <e0725782@student.tuwien.ac.at>
+-- Copyright (C) 2010 Stefan Rebernig <stefan.rebernig@gmail.com>
+-- Copyright (C) 2010 Manfred Schwarz <e0725898@student.tuwien.ac.at>
+-- Copyright (C) 2010 Bernhard Urban <lewurm@gmail.com>
+--
+-- 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 3 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
+
library IEEE;
use IEEE.std_logic_1164.all;
--RS232
constant UART_WIDTH : integer := 8;
subtype uart_data is std_logic_vector(UART_WIDTH-1 downto 0);
-constant BAUD_RATE_WITH : integer := 16;
-subtype baud_rate_l is std_logic_vector(BAUD_RATE_WITH-1 downto 0);
+constant BAUD_RATE_WIDTH : integer := 16;
+subtype baud_rate_l is std_logic_vector(BAUD_RATE_WIDTH-1 downto 0);
--CLKs
--constant CLK_FREQ_MHZ : real := 33.33;
--constant BAUD_RATE : integer := 115200;
--constant CLK_PER_BAUD : integer := integer((CLK_FREQ_MHZ * 1000000.0) / real(BAUD_RATE) - 0.5);
-constant CLK_PER_BAUD : integer := 434;
+-- constant CLK_PER_BAUD : integer := 434;
+-- constant CLK_PER_BAUD : integer := 2083; -- @uni, bei 20MHz und 9600 Baud
+-- constant CLK_PER_BAUD : integer := 50; -- @modelsim
component extension_uart is
--some modules won't need all inputs/outputs
generic (
-- active reset value
- RESET_VALUE : std_logic
+ RESET_VALUE : std_logic;
+ CLK_PER_BAUD : integer
);
port(
--System inputs
-- general extension interface
ext_reg : in extmod_rec;
data_out : out gp_register_t;
+
+ uart_int : out std_logic;
-- Input
bus_rx : in std_logic;
-- Ouput
component rs232_rx is
generic (
-- active reset value
- RESET_VALUE : std_logic
+ RESET_VALUE : std_logic;
+ SYNC_STAGES : integer range 2 to integer'high
);
port(
sys_res_n : in std_logic;
--Bus
- bus_rx : in std_logic;
+ bus_rx_unsync : in std_logic;
--To sendlogic
new_rx_data : out std_logic;