Reputation: 513
vhdl tristate output in lattice diamond
i'm trying to write a module to read/write to a sram ic (CY7C1011CV33 -10ns), but I'm having a hard time outputting something to the inout port. I was able to make things work close enough to how I want, but now I have a different problem. When I add this module to my design I can synthesize, but when I try to design the map I get the following error:
WARNING - Register MEMORY/Opin_11__I_0_i2 has a clock signal tied to GND. WARNING - Register MEMORY/Opin_11__I_0_i3 has a clock signal tied to GND. WARNING - Register MEMORY/Opin_11__I_0_i4 has a clock signal tied to GND. WARNING - Register MEMORY/Opin_11__I_0_i5 has a clock signal tied to GND. WARNING - Register MEMORY/Opin_11__I_0_i6 has a clock signal tied to GND. WARNING - Register MEMORY/Opin_11__I_0_i7 has a clock signal tied to GND. WARNING - Register MEMORY/Opin_11__I_0_i8 has a clock signal tied to GND. WARNING - Register MEMORY/Opin_11__I_0_i9 has a clock signal tied to GND. WARNING - Register MEMORY/Opin_11__I_0_i10 has a clock signal tied to GND. WARNING - Register MEMORY/Opin_11__I_0_i11 has a clock signal tied to GND. WARNING - Register MEMORY/Opin_11__I_0_i12 has a clock signal tied to GND. WARNING - Register MEMORY/Opin_11__I_0_i1 has a clock signal tied to GND. WARNING - EHXPLLJ 'OSCmain/PLLInst_0' cannot obtain FREQUENCY_PIN_CLKOP=260.000 when FREQUENCY_PIN_CLKI=133.000, CLKI_DIV=5, CLKFB_DIV=13, CLKOP_DIV=2. ERROR - L6MUX21 MUX/i672/GATE has missing data input. Check for dangling nets or logic. INFO - Errors found in user's design. Output files not written. Check map report for more details.
this part used to work before, so when I find the problem I'll update here
update to the code and testbench added update 2: newer version of the code added, almost working
new code: this does what I want, more or less, I just need to adjust the timing but it synthesizes.
---------------------------------------------------
-- Ainda sendo escrito
-- Vai comunicar com o SRAM CY7C1011CV33 -10ns
---------------------------------------------------
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
entity SRAM is
generic(n: natural :=12 );
Port (
-- FPGA INTERNAL ----
clk : in STD_LOGIC; -- internal clock
send : in STD_LOGIC; -- low to send data
get : in STD_LOGIC; -- low to get data
Ipin : in STD_LOGIC_VECTOR (11 downto 0); -- data to send to sram
Opin : out STD_LOGIC_VECTOR (11 downto 0); -- data to send to fpga
add : in STD_LOGIC_VECTOR (16 downto 0); -- sram address input
drdy : out std_logic; -- data ready
---------------------------------------------
-- To sram ----------------------------------
---------------------------------------------
Address : out STD_LOGIC_VECTOR (16 downto 0);
Data : inout STD_LOGIC_VECTOR (11 downto 0);
CE : out STD_LOGIC;
WE : out STD_LOGIC;
OE : out STD_LOGIC;
BHE : out STD_LOGIC
);
end SRAM;
architecture Behavioral of SRAM is
signal clk_div : STD_LOGIC_VECTOR (1 downto 0) := B"00";
signal clk_PH : STD_LOGIC_VECTOR (1 downto 0) := B"00";
signal Zero : STD_LOGIC_VECTOR (n-1 downto 0) := B"000000000000";
-- for inout port
signal tmpdata : STD_LOGIC_VECTOR(11 downto 0);
signal TMPCE : STD_LOGIC := '1';
signal TMPWE : STD_LOGIC := '1';
signal TMPOE : STD_LOGIC := '1';
signal TMPBHE : STD_LOGIC := '1';
signal TMPDRDY : STD_LOGIC := '1';
begin
-- clock divider
process (clk)
begin
if (rising_edge(clk) and (send ='0' or get = '0')) then
clk_div <= clk_div + '1';
end if;
end process;
-- clock divider phase 90
process (clk)
begin
if (falling_edge(clk) and (send ='0' or get = '0')) then
clk_ph <= clk_ph + '1';
end if;
end process;
process(clk_div, clk_ph, clk)
begin
-- WRITE TO SRAM
if (send = '0') then
Address <= add;
tmpdata <= Zero;
TMPCE <= '0';
TMPWE <= '0';
TMPOE <= '1';
TMPBHE <= '0';
TMPdrdy <= '1';
TMPCE <= '1';
TMPWE <= '1';
TMPOE <= '1';
TMPBHE <= '1';
TMPdrdy <= '1';
case clk_div is
when b"00" =>
TMPCE <= '0';
TMPWE <= '0';
TMPOE <= '1';
TMPBHE <= '0';
TMPdrdy <= '1';
when b"01" =>
TMPCE <= '0';
TMPWE <= '0';
TMPOE <= '1';
TMPBHE <= '0';
TMPdrdy <= '1';
when others =>
TMPCE <= '1';
TMPWE <= '1';
TMPOE <= '1';
TMPBHE <= '1';
TMPdrdy <= '1';
end case;
case clk_ph is
--when b"00" =>
--tmpdata <= Ipin;
when b"01" =>
tmpdata <= Ipin;
when b"10" =>
tmpdata <= Ipin;
when others =>
tmpdata <= Zero;
end case;
end if;
-- READ FROM SRAM
if (send = '1' and get ='0') then
Address <= add;
TMPCE <= '0';
TMPOE <= '0';
TMPBHE <= '0';
TMPWE <= '1';
TMPDRDY <= '1';
case clk_div is
when b"01" =>
Opin <= data;
when b"10" =>
Opin <= data;
TMPDRDY <= '0';
when others =>
TMPCE <= '1';
TMPWE <= '1';
TMPOE <= '1';
TMPBHE <= '1';
end case;
end if;
end process;
Data <= tmpdata when send = '0' else (others => 'Z');
CE <= TMPCE;
WE <= TMPWE;
OE <= TMPOE;
BHE <= TMPBHE;
drdy <= TMPDRDY;
end Behavioral;-- VHDL Test Bench Created from source file SRAM.vhd -- Wed May 30 21:37:25 2018
--
-- Notes:
-- 1) This testbench template has been automatically generated using types
-- std_logic and std_logic_vector for the ports of the unit under test.
-- Lattice recommends that these types always be used for the top-level
-- I/O of a design in order to guarantee that the testbench will bind
-- correctly to the timing (post-route) simulation model.
-- 2) To use this template as your testbench, change the filename to any
-- name of your choice with the extension .vhd, and use the "source->import"
-- menu in the ispLEVER Project Navigator to import the testbench.
-- Then edit the user defined section below, adding code to generate the
-- stimulus for your design.
-- 3) VHDL simulations will produce errors if there are Lattice FPGA library
-- elements in your design that require the instantiation of GSR, PUR, and
-- TSALL and they are not present in the testbench. For more information see
-- the How To section of online help.
--
LIBRARY ieee;
USE ieee.std_logic_1164.ALL;
USE ieee.numeric_std.ALL;
ENTITY testbench IS
END testbench;
ARCHITECTURE behavior OF testbench IS
COMPONENT SRAM
PORT(
clk : IN std_logic;
send : IN std_logic;
get : IN std_logic;
Ipin : IN std_logic_vector(11 downto 0);
add : IN std_logic_vector(16 downto 0);
Data : INOUT std_logic_vector(11 downto 0);
Opin : OUT std_logic_vector(11 downto 0);
drdy : OUT std_logic;
Address : OUT std_logic_vector(16 downto 0);
CE : OUT std_logic;
WE : OUT std_logic;
OE : OUT std_logic;
BHE : OUT std_logic
);
END COMPONENT;
SIGNAL clk : std_logic;
SIGNAL send : std_logic;
SIGNAL get : std_logic;
SIGNAL Ipin : std_logic_vector(11 downto 0);
SIGNAL Opin : std_logic_vector(11 downto 0);
SIGNAL add : std_logic_vector(16 downto 0);
SIGNAL drdy : std_logic;
SIGNAL Address : std_logic_vector(16 downto 0);
SIGNAL Data : std_logic_vector(11 downto 0);
SIGNAL CE : std_logic;
SIGNAL WE : std_logic;
SIGNAL OE : std_logic;
SIGNAL BHE : std_logic;
constant delay : time := 10 ns;
BEGIN
-- Please check and add your generic clause manually
uut: SRAM PORT MAP(
clk => clk,
send => send,
get => get,
Ipin => Ipin,
Opin => Opin,
add => add,
drdy => drdy,
Address => Address,
Data => Data,
CE => CE,
WE => WE,
OE => OE,
BHE => BHE
);
send <= '0';
get <= '1';
Ipin <= B"000011110000";
add <= B"00000000000000001";
-- *** Test Bench - User Defined Section ***
tb : PROCESS
BEGIN
clk <= '0';
wait for delay;
clk <= '1';
wait for delay;
clk <= '0';
wait for delay;
clk <= '1';
wait for delay;
clk <= '0';
wait for delay;
clk <= '1';
wait for delay;
clk <= '0';
wait for delay;
clk <= '1';
END PROCESS;
-- *** End Test Bench - User Defined Section ***
END;
I'm still learning how to VHDL and fpga so I imagine that there is quite a bit of errors on my whole thought process though this code.
here is a quick drawing of what I am trying to produce (when something goes high it just means something is being 'transmitted also add doesn't need to go low on the end):
Upvotes: 1
Views: 1383
Answers (0)
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