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VHDL Schieberegister

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Marc10k
Neuling


Beiträge: 7

New PostErstellt: 02.11.04, 12:38  Betreff: VHDL Schieberegister  drucken  Thema drucken  weiterempfehlen Antwort mit Zitat  

Mein VHLD Programm soll 35 bit (jetzt aber erstmal 7) seriell übertragen nach dem die Run-Taste und der Modus abgefragt wurde. Ich wollte erst die beiden Eingänge abfragen und dann mit jedem Clockzyklus ein bit übertragen. Es werden später beim Sender und Empfänger die gleiche Clock benutzt. Bei ansteigender Flanke werden die Daten geschrieben und bei fallender dann gelesen. Damit das ganze statisch bleibt.
Ich habe schon folgendes geschrieben:


library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;

entity Sender is
Port ( Reset : in std_logic;
Run : in std_logic;
Mode : in std_logic_vector(1 downto 0);
clock : in std_logic;
Data : out std_logic);
end Sender;

architecture Behavioral of Sender is
begin

process (Mode, Run, clock)
variable shift_reg: std_logic_vector(6 downto 0):= "1111111";
begin
if Run = '1' then
case Mode is
when "00" => -- good header, data segment 1 and checksum
Data <= '1';
for I in 0 to 6 loop
shift_reg := "0010010";
if (clock'event and clock = '1') then
shift_reg(6 downto 1) := shift_reg (5 downto 0);
Data <= shift_reg(6);
end if;
end loop;
when "01" => -- good header, data segment 2 and checksum
Data <= '1';
when "10" => -- invalid header, data segment 1, checksum
Data <= '1';
when "11" => -- good header, datasegment 2, invalid checksum
Data <= '1';
when others =>
Data <= 'X';
end case;
end if;
end process;
end Behavioral;

Nur leider bekommen ich immer folgende Fehlermeldung:
Signal Data cannot be synthesized, bad synchronous description.

Kennt jemand Abhilfe?

Gruss

Marcus

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Dr. Faustus

Administrator

Beiträge: 107
Ort: Aßling


New PostErstellt: 02.11.04, 12:45  Betreff: Re: VHDL Schieberegister  drucken  weiterempfehlen Antwort mit Zitat  

Probier mal das:

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;

entity Sender is
Port ( Reset : in std_logic;
Run : in std_logic;
Mode : in std_logic_vector(1 downto 0);
clock : in std_logic;
Data : out std_logic);
end Sender;

architecture Behavioral of Sender is
begin

process (Mode, Run, clock)
variable shift_reg: std_logic_vector(6 downto 0):= "1111111";
begin
if (clock'event and clock = '1') then
if Run = '1' then
case Mode is
when "00" => -- good header, data segment 1 and checksum
Data <= '1';

for I in 0 to 6 loop
shift_reg := "0010010";

shift_reg(6 downto 1) := shift_reg (5 downto 0);
Data <= shift_reg(6);
end loop;
when "01" => -- good header, data segment 2 and checksum
Data <= '1';
when "10" => -- invalid header, data segment 1, checksum
Data <= '1';
when "11" => -- good header, datasegment 2, invalid checksum
Data <= '1';
when others =>
Data <= 'X';
end case;
end if;
end if;
end process;
end Behavioral;


Gruesse,

Michael

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Marc10k
Neuling


Beiträge: 7

New PostErstellt: 02.11.04, 14:26  Betreff: Re: VHDL Schieberegister  drucken  weiterempfehlen Antwort mit Zitat  

Vielen Dank es klappt.

Gruss

Marcus

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Marc10k
Neuling


Beiträge: 7

New PostErstellt: 03.11.04, 17:37  Betreff: Re: VHDL Schieberegister  drucken  weiterempfehlen Antwort mit Zitat  

Meine Vorfreude war vielleicht etwas zu früh. Den Fehler habe ich nicht mehr aber es werden leider auch meine Daten nicht mit der Clock übertragen. Ich den Code abgeändert und versucht die Daten im Takt der Clock zu übertragen. Nur leider klappt es nicht so wie ich mir das so vorstelle. Vielleicht kann jemand mir helfen.

Hier mein jetzige Code:


library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;

-- Header 7 bits 0010010
-- Data 1 24 bits 264744 - 0010.0110.0100.0111.0100.0100
-- Data 2 24 bits 199408 - 0001.1001.1001.0100.0000.1000
-- Checksum 4 bits

entity Sender is
Port ( Reset : in std_logic;
Run : in std_logic;
Mode : in std_logic_vector(1 downto 0);
clock : in std_logic;
Data : out std_logic);
end Sender;

architecture Behavioral of Sender is
begin

process (Mode, Run, clock)
variable shift_reg_h: std_logic_vector(6 downto 0);
variable shift_reg_d: std_logic_vector(23 downto 0);
variable shift_reg_c: std_logic_vector(3 downto 0);
variable M : integer;

begin
if (clock'event and clock = '1') then
if Run = '1' then
case Mode is
when "00" => -- good header, data segment 1 and checksum
-- send the header first
shift_reg_h := "0010010";
for I in 0 to 6 loop
shift_reg_h (6 downto 1) := shift_reg_h (5 downto 0);
if (clock'event and clock = '0') then
Data <= shift_reg_h (6);
end if;
end loop;
-- send the datasegment next
shift_reg_d := "001001100100011101000100"; --Marcus number
for I in 0 to 23 loop
shift_reg_d (23 downto 1) := shift_reg_d (22 downto 0);
Data <= shift_reg_d (23);
end loop;
-- send the checksum last

when "01" => -- good header, data segment 2 and checksum
-- send the header first
shift_reg_h := "0010010";
for I in 0 to 6 loop
shift_reg_h (6 downto 1) := shift_reg_h (5 downto 0);
Data <= shift_reg_h (6);
end loop;
-- send the datasegment last
shift_reg_d := "000110011001010000001000"; -- Johns number
for I in 0 to 23 loop
shift_reg_d (23 downto 1) := shift_reg_d (22 downto 0);
Data <= shift_reg_d (23);
end loop;
-- send the checksum last

when "10" => -- invalid header, data segment 1, checksum
-- send the invalid header first
shift_reg_h := "0000000"; -- INVALID HEADER
for I in 0 to 6 loop
shift_reg_h (6 downto 1) := shift_reg_h (5 downto 0);
Data <= shift_reg_h (6);
end loop;
-- send the datasegment last
shift_reg_d := "001001100100011101000100"; --Marcus number
for I in 0 to 23 loop
shift_reg_d (23 downto 1) := shift_reg_d (22 downto 0);
Data <= shift_reg_d (23);
end loop;
-- send the checksum last

when "11" => -- good header, datasegment 2, invalid checksum
-- send the header first
shift_reg_h := "0010010";
for I in 0 to 6 loop
shift_reg_h (6 downto 1) := shift_reg_h (5 downto 0);
Data <= shift_reg_h (6);
end loop;
-- send the datasegment next
shift_reg_d := "000110011001010000001000"; -- Johns number
for I in 0 to 23 loop
shift_reg_d (23 downto 1) := shift_reg_d (22 downto 0);
Data <= shift_reg_d (23);
end loop;
-- send the checksum last (INVALID)

when others =>
Data <= 'X';
end case;
end if;
end if;
end process;
end Behavioral;


Anbei auch noch mal der Code als vhd Datei.



Dateianlagen:

Sender.vhd (3 kByte)
anzeigen - speichern
Datei wurde schon 373-mal heruntergeladen.

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xiaoou
Vielschreiber


Beiträge: 53

New PostErstellt: 12.11.18, 07:03  Betreff: xiaoou  drucken  weiterempfehlen Antwort mit Zitat  

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New PostErstellt: 22.09.20, 09:59  Betreff: Re: VHDL Schieberegister  drucken  weiterempfehlen Antwort mit Zitat  

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