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https://opencores.org/ocsvn/wb_uart/wb_uart/trunk
Subversion Repositories wb_uart
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/wb_uart/trunk/src/uart_baudgen.vhd
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-- |
-- UART Baudrate generator |
-- |
-- Author: Sebastian Witt |
-- Date: 27.01.2008 |
-- Version: 1.1 |
-- |
-- This code is free software; you can redistribute it and/or |
-- modify it under the terms of the GNU Lesser General Public |
-- License as published by the Free Software Foundation; either |
-- version 2.1 of the License, or (at your option) any later version. |
-- |
-- This code 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 |
-- Lesser General Public License for more details. |
-- |
-- You should have received a copy of the GNU Lesser General Public |
-- License along with this library; if not, write to the |
-- Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
-- Boston, MA 02111-1307 USA |
-- |
|
LIBRARY IEEE; |
USE IEEE.std_logic_1164.all; |
USE IEEE.numeric_std.all; |
|
-- Serial UART baudrate generator |
entity uart_baudgen is |
port ( |
CLK : in std_logic; -- Clock |
RST : in std_logic; -- Reset |
CE : in std_logic; -- Clock enable |
CLEAR : in std_logic; -- Reset generator (synchronization) |
DIVIDER : in std_logic_vector(15 downto 0); -- Clock divider |
BAUDTICK : out std_logic -- 16xBaudrate tick |
); |
end uart_baudgen; |
|
architecture rtl of uart_baudgen is |
-- Signals |
signal iCounter : unsigned(15 downto 0); |
begin |
-- Baudrate counter |
BG_COUNT: process (CLK, RST) |
begin |
if (RST = '1') then |
iCounter <= (others => '0'); |
BAUDTICK <= '0'; |
elsif (CLK'event and CLK = '1') then |
if (CLEAR = '1') then |
iCounter <= (others => '0'); |
elsif (CE = '1') then |
iCounter <= iCounter + 1; |
end if; |
|
BAUDTICK <= '0'; |
if (iCounter = unsigned(DIVIDER)) then |
iCounter <= (others => '0'); |
BAUDTICK <= '1'; |
end if; |
end if; |
end process; |
|
end rtl; |
|
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