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  1. Valentin

    CLK not lvcmos18

    What drive strength i need use?
  2. Valentin

    CLK not lvcmos18

    HI. I through clocking wizard created clock = 50 MHz. But oscilloscope give me amplitude lvcmos12 instead lvcmos18. Constraint is set to lvcmos18, stregth = 12. When I set constant = 1, I measure voltage=1.8V. When change stregth, amplitude is also changed. Please tell me where I have a mistake?
  3. Yes, mistake in DATA_N. Thanks a lot.
  4. HI. I try simulate ISERDESE2. But it doesn't work. Below my code: ---------------------------------------------------------------------------------- library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_unsigned.all; use ieee.std_logic_arith.all; library UNISIM; use UNISIM.Vcomponents.ALL; entity CLK_DAC is Port ( CLK_200MHz_P : in STD_LOGIC; CLK_200MHz_N : in STD_LOGIC; DCO_P : in STD_LOGIC; DCO_N : in STD_LOGIC; RESET : in STD_LOGIC; DATA_P : in STD_LOGIC; DATA_N : in STD_LOGIC; DATA_Sample0 : out STD_LOGIC_VECTOR(7 downto 0); Serial_out : out STD_LOGIC; TXCLK : out STD_LOGIC; TXCLKDIV : out STD_LOGIC); end CLK_DAC; architecture RTL of CLK_DAC is signal DCO_ibugds : std_logic; signal Data_ibufds : std_logic; signal CLK_IDelay : std_logic; signal CLK200MHZ_IBUFGDS : std_logic; signal CLK200_BUFG : std_logic; signal CLK_bufio : std_logic; signal CLK_bufr : std_logic; signal CLKB : std_logic; signal arAcqData : std_logic_vector(7 downto 0); signal Comb_out : std_logic; begin ---------------------------------------------------------------------------------- IBUFGDS_DCO_AD9430 : IBUFGDS port map ( O => DCO_ibugds, I => DCO_P, IB => DCO_N ); BUFIO_inst : BUFIO port map ( O => CLK_bufio, -- 1-bit output: Clock output (connect to I/O clock loads). I => DCO_ibugds -- 1-bit input: Clock input (connect to an IBUF or BUFMR). ); BUFR_inst : BUFR generic map ( BUFR_DIVIDE => "4" -- Values: "BYPASS, 1, 2, 3, 4, 5, 6, 7, 8" ) port map ( O => CLK_bufr, -- 1-bit output: Clock output port CE => '1', -- 1-bit input: Active high, clock enable (Divided modes only) CLR => '0', -- 1-bit input: Active high, asynchronous clear (Divided modes only) I => DCO_ibugds -- 1-bit input: Clock buffer input driven by an IBUF, MMCM or local interconnect ); TXCLKDIV <= CLK_bufr; TXCLK <= CLK_bufio; ---------------------------------------------------------------------------- IBUFGDS_DATA_AD9430 : IBUFDS port map ( O => Data_ibufds, I => DATA_P, IB => DATA_N ); CLKB <= not CLK_bufio; ISERDESE2_inst : ISERDESE2 generic map ( DATA_RATE => "DDR", -- DDR, SDR DATA_WIDTH => 8, -- Parallel data width (2-8,10,14) DYN_CLKDIV_INV_EN => "FALSE", -- Enable DYNCLKDIVINVSEL inversion (FALSE, TRUE) DYN_CLK_INV_EN => "FALSE", -- Enable DYNCLKINVSEL inversion (FALSE, TRUE) -- INIT_Q1 - INIT_Q4: Initial value on the Q outputs (0/1) INIT_Q1 => '0', INIT_Q2 => '0', INIT_Q3 => '0', INIT_Q4 => '0', INTERFACE_TYPE => "NETWORKING", -- MEMORY, MEMORY_DDR3, MEMORY_QDR, NETWORKING, OVERSAMPLE IOBDELAY => "NONE", -- NONE, BOTH, IBUF, IFD NUM_CE => 2, -- Number of clock enables (1,2) OFB_USED => "FALSE", -- Select OFB path (FALSE, TRUE) SERDES_MODE => "MASTER", -- MASTER, SLAVE -- SRVAL_Q1 - SRVAL_Q4: Q output values when SR is used (0/1) SRVAL_Q1 => '0', SRVAL_Q2 => '0', SRVAL_Q3 => '0', SRVAL_Q4 => '0' ) port map ( O => Comb_out, -- 1-bit output: Combinatorial output -- Q1 - Q8: 1-bit (each) output: Registered data outputs Q1 => arAcqData(0), Q2 => arAcqData(1), Q3 => arAcqData(2), Q4 => arAcqData(3), Q5 => arAcqData(4), Q6 => arAcqData(5), Q7 => arAcqData(6), Q8 => arAcqData(7), -- SHIFTOUT1, SHIFTOUT2: 1-bit (each) output: Data width expansion output ports SHIFTOUT1 => open, SHIFTOUT2 => open, BITSLIP => '0', -- 1-bit input: The BITSLIP pin performs a Bitslip operation synchronous to -- CLKDIV when asserted (active High). Subsequently, the data seen on the -- Q1 to Q8 output ports will shift, as in a barrel-shifter operation, one -- position every time Bitslip is invoked (DDR operation is different from -- SDR). -- CE1, CE2: 1-bit (each) input: Data register clock enable inputs CE1 => '1', CE2 => '1', CLKDIVP => '0', -- 1-bit input: TBD -- Clocks: 1-bit (each) input: ISERDESE2 clock input ports CLK => CLK_bufio, -- 1-bit input: High-speed clock CLKB => CLKB, -- 1-bit input: High-speed secondary clock CLKDIV => CLK_bufr, -- 1-bit input: Divided clock OCLK => '0', -- 1-bit input: High speed output clock used when INTERFACE_TYPE="MEMORY" -- Dynamic Clock Inversions: 1-bit (each) input: Dynamic clock inversion pins to switch clock polarity DYNCLKDIVSEL => '0', -- 1-bit input: Dynamic CLKDIV inversion DYNCLKSEL => '0', -- 1-bit input: Dynamic CLK/CLKB inversion -- Input Data: 1-bit (each) input: ISERDESE2 data input ports D => Data_ibufds, -- 1-bit input: Data input DDLY => '0', -- 1-bit input: Serial data from IDELAYE2 OFB => '0', -- 1-bit input: Data feedback from OSERDESE2 OCLKB => '0', -- 1-bit input: High speed negative edge output clock RST => RESET, -- 1-bit input: Active high asynchronous reset -- SHIFTIN1, SHIFTIN2: 1-bit (each) input: Data width expansion input ports SHIFTIN1 => '0', SHIFTIN2 => '0' ); Serial_out <= Comb_out; DATA_Sample0 <= arAcqData; end RTL; Please tell me where I have a mistake! Thanks.
  5. Please explain how software get link between DCM and corresponding BUFGCTRL. ERROR:Place:962 - A DCM / BUFGCTRL clock component pair have been found that are not placed at an optimal DCM / BUFGCTRL site pair. The DCM component <DCM0> is locked to site <DCM_X0Y1> and the corresponding BUFGCTRL component <BufgceClk80P180/BUFGMUX> is locked to site <BUFGMUX_X2Y1>. Wherefrom software take that element locked to site <BUFGMUX_X2Y1>? Why not, for example, <BUFGMUX_X1Y1> or <BUFGMUX_X0Y1>? Do I understand correctly that I can export clock from DCM to only GCLK or *HCLK pins?
  6. I mean generate very simple sequence. I would like to know how it generate using vhdl.
  7. Hello. I want generate digital waveform using fpga. Are any examples where described it?
  8. It works. Also may use bufg instead bugce.
  9. Is it possible to solve problem without using ODDR and use BUFG?
  10. I try use DCM in Basys2 board. But when I compile project I have an error: ERROR:Place:962 - A DCM / BUFGCTRL clock component pair have been found that are not placed at an optimal DCM / BUFGCTRL site pair. The DCM component <DCM0> is locked to site <DCM_X0Y1> and the corresponding BUFGCTRL component <BufgceClk80P180/BUFGMUX> is locked to site <BUFGMUX_X2Y1>. This will not allow the usage of the fast path between the DCM and the Clock buffer. If this sub optimal condition is acceptable for this design, you may use the CLOCK_DEDICATED_ROUTE constraint in the .ucf file to demote this message to a WARNING and allow your design to continue. However, the use of this override is highly discouraged as it may lead to very poor timing results. It is recommended that this error condition be corrected in the design. A list of all the COMP.PINs used in this clock placement rule is listed below. These examples can be used directly in the .ucf file to override this clock rule. < PIN "DCM0.CLK2X180" CLOCK_DEDICATED_ROUTE = FALSE; > Please help me to solve this error.