| Line 1... |
Line 1... |
-------------------------------------------------------------------------------------------------100
|
-------------------------------------------------------------------------------------------------100
|
--| Modular Oscilloscope
|
--| Modular Oscilloscope
|
--| UNSL - Argentine
|
--| UNSL - Argentine
|
--|
|
--|
|
--| File: channel_selector.vhd
|
--| File: ctrl_channel_selector.vhd
|
--| Version: 0.2
|
--| Version: 0.3
|
--| Tested in: Actel A3PE1500
|
--| Tested in: Actel A3PE1500
|
--| Board: RVI Prototype Board + LP Data Conversion Daughter Board
|
--| Board: RVI Prototype Board + LP Data Conversion Daughter Board
|
--|-------------------------------------------------------------------------------------------------
|
--|-------------------------------------------------------------------------------------------------
|
--| Description:
|
--| Description:
|
--| CONTROL - Channel Selector
|
--| CONTROL - Channel Selector
|
| Line 13... |
Line 13... |
--|
|
--|
|
--|-------------------------------------------------------------------------------------------------
|
--|-------------------------------------------------------------------------------------------------
|
--| File history:
|
--| File history:
|
--| 0.1 | jul-2009 | First testing
|
--| 0.1 | jul-2009 | First testing
|
--| 0.2 | jul-2009 | Added generic number of channel
|
--| 0.2 | jul-2009 | Added generic number of channel
|
|
--| 0.3 | jul-2009 | Added signal indicating when it's selecting the first channel
|
----------------------------------------------------------------------------------------------------
|
----------------------------------------------------------------------------------------------------
|
--| Copyright © 2009, Facundo Aguilera.
|
--| Copyright © 2009, Facundo Aguilera.
|
--|
|
--|
|
--| This VHDL design file is an open design; you can redistribute it and/or
|
--| This VHDL design file is an open design; you can redistribute it and/or
|
--| modify it and/or implement it after contacting the author.
|
--| modify it and/or implement it after contacting the author.
|
----------------------------------------------------------------------------------------------------
|
----------------------------------------------------------------------------------------------------
|
|
|
|
|
--==================================================================================================
|
--==================================================================================================
|
-- TODO
|
-- TODO
|
-- · Speed up the design
|
-- · Speed up...
|
|
-- · Generic width in channel_number_O
|
--==================================================================================================
|
--==================================================================================================
|
|
|
|
|
library ieee;
|
library ieee;
|
use ieee.std_logic_1164.all;
|
use ieee.std_logic_1164.all;
|
--use IEEE.STD_LOGIC_UNSIGNED.ALL;
|
--use IEEE.STD_LOGIC_UNSIGNED.ALL;
|
use IEEE.NUMERIC_STD.ALL;
|
use IEEE.NUMERIC_STD.ALL;
|
use ieee.math_real.all;
|
use ieee.math_real.all;
|
|
|
|
|
|
|
----------------------------------------------------------------------------------------------------
|
----------------------------------------------------------------------------------------------------
|
----------------------------------------------------------------------------------------------------
|
----------------------------------------------------------------------------------------------------
|
entity channel_selector is
|
entity ctrl_channel_selector is
|
generic(
|
generic(
|
N_CHANNELS: integer := 16 -- number of channels
|
CHANNEL_WIDTH: integer := 4 -- number of channels 2**CHANNEL_WIDTH, max. 4
|
);
|
);
|
port(
|
port(
|
channels_I: in std_logic_vector(N_CHANNELS-1 downto 0);
|
channels_I: in std_logic_vector(integer(2**real(CHANNEL_WIDTH))-1 downto 0);
|
channel_number_O: out std_logic_vector(3 downto 0);
|
channel_number_O: out std_logic_vector(3 downto 0);
|
|
first_channel_O: out std_logic;
|
clk_I: in std_logic;
|
clk_I: in std_logic;
|
enable_I: in std_logic;
|
enable_I: in std_logic;
|
reset_I: in std_logic
|
reset_I: in std_logic
|
);
|
);
|
end entity channel_selector;
|
end entity channel_selector;
|
|
|
|
|
----------------------------------------------------------------------------------------------------
|
----------------------------------------------------------------------------------------------------
|
----------------------------------------------------------------------------------------------------
|
----------------------------------------------------------------------------------------------------
|
architecture ARCH01 of channel_selector is
|
architecture ARCH01 of ctrl_channel_selector is
|
constant CHANNEL_WIDTH: integer := integer(ceil(log2(real(N_CHANNELS))));
|
constant N_CHANNELS: integer := integer(2**real(CHANNEL_WIDTH));
|
|
-- signal channel: unsigned(CHANNEL_WIDTH-1 downto 0);
|
|
-- signal next_channel: unsigned(CHANNEL_WIDTH-1 downto 0);
|
|
-- signal next_is_first_channel: std_logic;
|
signal channel: unsigned(CHANNEL_WIDTH-1 downto 0);
|
signal channel: unsigned(CHANNEL_WIDTH-1 downto 0);
|
signal next_channel: unsigned(CHANNEL_WIDTH-1 downto 0);
|
signal next_channel: unsigned(CHANNEL_WIDTH downto 0);
|
|
signal next_is_first_channel: std_logic;
|
|
signal rotated: unsigned(N_CHANNELS-1 downto 0);
|
|
signal plus: unsigned(CHANNEL_WIDTH downto 0);
|
begin
|
begin
|
|
|
--------------------------------------------------------------------------------------------------
|
--------------------------------------------------------------------------------------------------
|
-- Output
|
-- Output
|
channel_number_O <= (3 downto CHANNEL_WIDTH => '0') & std_logic_vector(channel);
|
channel_number_O <= (3 downto CHANNEL_WIDTH => '0') & std_logic_vector(channel);
|
--channel_number_O <= std_logic_vector(channel);
|
--channel_number_O <= std_logic_vector(channel);
|
--------------------------------------------------------------------------------------------------
|
--------------------------------------------------------------------------------------------------
|
-- Combinational selection
|
-- Combinational selection of next channel
|
|
|
P_comb: process(channel,channels_I)
|
|
variable j : integer range 0 to N_CHANNELS-1;
|
|
variable index: integer range 0 to N_CHANNELS-1;
|
|
begin
|
|
|
|
|
-- P_comb: process(channel,channels_I)
|
|
-- variable j : integer range 0 to N_CHANNELS-1;
|
|
-- variable index: integer range 0 to N_CHANNELS-1;
|
|
-- begin
|
|
|
|
-- for j in 0 to N_CHANNELS-1 loop
|
|
|
|
-- if (j + to_integer(channel) + 1) > (N_CHANNELS - 1) then
|
|
-- index := j + to_integer(channel) + 1 - N_CHANNELS;
|
|
-- next_is_first_channel <= '1';
|
|
-- else
|
|
-- index := j + to_integer(channel) + 1;
|
|
-- next_is_first_channel <= '0';
|
|
-- end if;
|
|
|
-- -- for i in 0 to N_CHANNELS loop
|
-- if channels_I(index) = '1' then
|
-- if i = to_integer(channel) then
|
-- next_channel <= to_unsigned(index, CHANNEL_WIDTH);
|
-- exit;
|
-- exit;
|
|
-- else
|
|
-- next_channel <= channel;
|
-- end if;
|
-- end if;
|
-- end loop;
|
-- end loop;
|
|
-- end process;
|
|
|
-- for i in 0 to N_CHANNELS loop
|
--100.0 MHz 67.1 MHz (N_CHANNELS = 16)
|
--i := to_natural(channel);
|
-- 271 of 38400 (1%)
|
for j in 0 to N_CHANNELS-1 loop
|
|
|
|
if (j + to_integer(channel) + 1) > (N_CHANNELS - 1) then
|
|
index := j + to_integer(channel) + 1 - N_CHANNELS;
|
|
else
|
|
index := j + to_integer(channel) + 1;
|
|
end if;
|
|
|
|
if channels_I(index) = '1' then
|
|
next_channel <= to_unsigned(index, CHANNEL_WIDTH);
|
|
|
rotated <= unsigned(channels_I) ror (to_integer(channel));
|
|
next_channel <= ('0' & channel) + plus;
|
|
--next_channel <= channel + plus;
|
|
next_is_first_channel <= next_channel (CHANNEL_WIDTH);
|
|
P_coder: process(rotated)
|
|
variable i: integer range 1 to N_CHANNELS-1;
|
|
begin
|
|
for i in 1 to N_CHANNELS-1 loop
|
|
if rotated(i) = '1' then
|
|
plus <= to_unsigned(i, CHANNEL_WIDTH+1);
|
exit;
|
exit;
|
else
|
else
|
next_channel <= channel;
|
plus <= (CHANNEL_WIDTH =>'1') & (CHANNEL_WIDTH - 1 downto 0 => '0');
|
end if;
|
end if;
|
|
|
end loop;
|
end loop;
|
|
end process;
|
|
|
|
--100.0 MHz 70.6 MHz (N_CHANNELS = 16)
|
|
-- 137 of 38400 (0%)
|
|
|
|
--------------------------------------------------------------------------------------------------
|
|
-- Clocked selection of actual channel
|
|
|
|
-- P_clock: process(enable_I, reset_I, next_channel, clk_I)
|
|
-- begin
|
|
-- if clk_I'event and clk_I = '1' then
|
|
-- if reset_I = '1' then
|
-- for i in 0 to N_CHANNELS loop
|
-- channel <= (others => '0');
|
-- if channel = to_unsigned(i, 4) then
|
-- first_channel_O <= '1';
|
-- for j in i+1 to (2*N_CHANNELS)-1 loop
|
-- elsif enable_I = '1' then
|
-- if j > N_CHANNELS-1 then
|
-- channel <= next_channel;
|
-- index := j - N_CHANNELS;
|
-- first_channel_O <= next_is_first_channel;
|
-- else
|
|
-- index := j;
|
|
-- end if;
|
-- end if;
|
--
|
|
-- if channels_I(index) = '1' then
|
|
-- next_channel <= to_unsigned(index, CHANNEL_WIDTH);
|
|
-- exit;
|
|
-- else
|
|
-- next_channel <= channel;
|
|
-- end if;
|
-- end if;
|
-- end loop;
|
-- end process;
|
-- exit;
|
|
-- else
|
|
-- next_channel <= channel;
|
|
-- end if;
|
|
-- end loop;
|
|
|
|
end process;
|
|
|
|
|
|
--------------------------------------------------------------------------------------------------
|
|
-- Clocked
|
|
|
|
P_clock: process(enable_I, reset_I, next_channel, clk_I)
|
P_clock: process(enable_I, reset_I, next_channel, clk_I)
|
begin
|
begin
|
if clk_I'event and clk_I = '1' then
|
if clk_I'event and clk_I = '1' then
|
if reset_I = '1' then
|
if reset_I = '1' then
|
channel <= (others => '0');
|
channel <= (others => '0');
|
|
first_channel_O <= '1';
|
elsif enable_I = '1' then
|
elsif enable_I = '1' then
|
channel <= next_channel;
|
channel <= next_channel(CHANNEL_WIDTH-1 downto 0);
|
|
first_channel_O <= next_is_first_channel;
|
end if;
|
end if;
|
end if;
|
end if;
|
end process;
|
end process;
|
|
|
|
|
|
|
|
|
end architecture;
|
end architecture;
|
No newline at end of file
|
No newline at end of file
|
