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Block Diagrams

Block Diagrams. Top-Level Circuit for Lab 4, Tasks 2-4. step. run. loadA. IVA. loadB. IVB. loadA. loadB. 8. 8. OR. cnz. en. en. nexti. nexto. nexti. ld. ld. OR. OR. LFSR. LFSR. clk. clk. rst. rst. rst. rst. clk. clk. AND. not done. AND. X ” 00 ”. X ” 00 ”. 8.

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Block Diagrams

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  1. Block Diagrams

  2. Top-Level Circuit for Lab 4, Tasks 2-4

  3. step run loadA IVA loadB IVB loadA loadB 8 8 OR cnz en en nexti nexto nexti ld ld OR OR LFSR LFSR clk clk rst rst rst rst clk clk AND not done AND X”00” X”00” 8 8 en CNTR UP nexto 0 0 1 1 rst rst cnz cnz clk clk 8 8 k 10 A B = X”3FF” 10 k9..8 sel 2 8 done k7..0 LAB2 ≠ 0 En ‘0’ cnz X Y 8 8 LAB3 en nexto en nexto rst rst rst MISR rst MISR clk clk clk clk 8 8 XSGN YSGN

  4. Top-Level Circuit for Lab 4, Tasks 5 & 6

  5. Top-Level Unit for Lab 4, Tasks 5 & 6 entity lab4 is port( CLOCK : in std_logic; BTNL : in std_logic; BTNR : in std_logic; BTNU : in std_logic; BTNS : in std_logic; BTND : in std_logic; SW : in std_logic_vector(7 downto 0); LED : out std_logic_vector(7 downto 0); SEG : out std_logic_vector(6 downto 0); AN : out std_logic_vector(3 downto 0)); ); end entity lab4;

  6. LAB4 for TASK5 BTNL BTNL BTNR BTNU BTND BTNS SW CLOCK BTNR 8 clk BTNL BTNR BTNU BTND BTNS SW rst BUTTON_UNIT next_out SWITCH_UNIT CLK_RST_1 loadA loadB step run 8 8 rst clk loadA loadB step run IVA IVB clk LAB3e rst rst XSGN YSGN Xout Yout Aout Bout k clk 10 8 8 8 8 8 8 XSGN YSGN X Y A B k hex0 4 hex0 clk SSD_DRIVER 4 hex1 hex1 TASK5 4 hex2 hex2 rst 4 LED hex3 hex3 SEG AN 8 4 7 LED SEG AN

  7. step run loadA IVA loadB IVB loadB loadA 8 8 OR cnz en en nexti nexti ld ld OR OR nexto LFSR LFSR clk clk rst rst rst rst clk clk AND not done AND X”00” X”00” 8 8 en CNTR UP nexto 0 0 1 1 rst rst cnz cnz clk clk 8 8 k 10 A B = X”3FF” 10 k9..8 sel 2 8 done k7..0 LAB2 ≠ 0 En ‘0’ cnz X Y 8 8 LAB3e en nexto en nexto rst rst rst MISR rst MISR clk clk A B k clk clk 10 8 8 8 8 8 8 8 XSGN Xout Aout YSGN Yout Bout kout

  8. BUTTON_UNIT rst rst BTNL loadA Debouncer RED rst clk clk rst rst BTNR loadB Debouncer RED clk clk clk rst rst BTNU step Debouncer RED clk clk rst rst BTND next_out Debouncer RED rst clk clk run rst ‘1’ Q D BTNS en Debouncer RED clk clk

  9. SWITCH_UNIT 8 8 SW IVA 8 IVB

  10. CLK_RST_1 CLOCK clk BTNL rst BTNR

  11. SSD_DRIVER SEG(6..0) Counter UP Counter UP q(k-1..k-2) Counter UP COUNTER UP Counter UP clk AN OC Counter UP rst OC – One’s Complement

  12. LAB4 for TASK6 BTNL BTNL BTNR BTNU BTND BTNS SW CLOCK BTNR 8 clk BTNL BTNR BTNU BTND BTNS SW rst BUTTON_UNIT next_out SWITCH_UNIT CLK_RST_2 loadA loadB step run 8 8 rst clk loadA loadB step run IVA IVB clk LAB3e rst rst XSGN YSGN Xout Yout Aout Bout k clk 10 8 8 8 8 8 8 XSGN YSGN X Y A B k hex0 4 hex0 clk SSD_DRIVER 4 hex1 hex1 TASK5 4 hex2 hex2 rst 4 LED hex3 hex3 SEG AN 8 4 7 LED SEG AN

  13. CLK_RST_2 ‘0’ clkfx_obufg clkFX DCM_SP BUFG 0 clkfx clk clk_ibufg clk0_obufg clk100 IBUFG CLOCK clkin clk0 BUFG 1 BUFGMUX BTNL rst_or rst BTNR rst clkfb locked

  14. User Constraint File (UCF)

  15. User Constraint File (UCF) - LEDs # LEDs NET "LED<0>" LOC = "U16" | IOSTANDARD = "LVCMOS33"; NET "LED<1>" LOC = "V16" | IOSTANDARD = "LVCMOS33"; NET "LED<2>" LOC = "U15" | IOSTANDARD = "LVCMOS33"; NET "LED<3>" LOC = "V15" | IOSTANDARD = "LVCMOS33"; NET "LED<4>" LOC = "M11" | IOSTANDARD = "LVCMOS33"; NET "LED<5>" LOC = "N11" | IOSTANDARD = "LVCMOS33"; NET "LED<6>" LOC = "R11" | IOSTANDARD = "LVCMOS33"; NET "LED<7>" LOC = "T11" | IOSTANDARD = "LVCMOS33";

  16. User Constraint File (UCF) - SSD # Seven Segment Displays NET "SEG<0>" LOC = "T17" | IOSTANDARD = "LVCMOS33"; NET "SEG<1>" LOC = "T18" | IOSTANDARD = "LVCMOS33"; NET "SEG<2>" LOC = "U17" | IOSTANDARD = "LVCMOS33"; NET "SEG<3>" LOC = "U18" | IOSTANDARD = "LVCMOS33"; NET "SEG<4>" LOC = "M14" | IOSTANDARD = "LVCMOS33"; NET "SEG<5>" LOC = "N14" | IOSTANDARD = "LVCMOS33"; NET "SEG<6>" LOC = "L14" | IOSTANDARD = "LVCMOS33"; NET "AN<0>" LOC = "N16" | IOSTANDARD = "LVCMOS33"; NET "AN<1>" LOC = "N15" | IOSTANDARD = "LVCMOS33"; NET "AN<2>" LOC = "P18" | IOSTANDARD = "LVCMOS33"; NET "AN<3>" LOC = "P17" | IOSTANDARD = "LVCMOS33";

  17. User Constraint File (UCF) Switches # Switches NET "SW<0>" LOC = "T10" | IOSTANDARD = "LVCMOS33"; NET "SW<1>" LOC = "T9" | IOSTANDARD = "LVCMOS33"; NET "SW<2>" LOC = "V9" | IOSTANDARD = "LVCMOS33"; NET "SW<3>" LOC = "M8" | IOSTANDARD = "LVCMOS33"; NET "SW<4>" LOC = "N8" | IOSTANDARD = "LVCMOS33"; NET "SW<5>" LOC = "U8" | IOSTANDARD = "LVCMOS33"; NET "SW<6>" LOC = "V8" | IOSTANDARD = "LVCMOS33"; NET "SW<7>" LOC = "T5" | IOSTANDARD = "LVCMOS33";

  18. User Constraint File (UCF) Buttons # Buttons NET "BTNS" LOC = "B8" | IOSTANDARD = "LVCMOS33"; BTNS NET "BTNU" LOC = "A8" | IOSTANDARD = "LVCMOS33"; BTNU NET "BTNL" LOC = "C4" | IOSTANDARD = "LVCMOS33"; BTNL NET "BTND" LOC = "C9" | IOSTANDARD = "LVCMOS33"; BTND NET "BTNR" LOC = "D9" | IOSTANDARD = "LVCMOS33"; BTNR

  19. User Constraint File (UCF) CLOCK # Buttons NET "CLOCK" LOC = "V10" | IOSTANDARD = "LVCMOS33";

  20. Seven Segment Displays

  21. 4-Digit Seven Segment Display

  22. Patterns for Decimal Digits

  23. Patterns for Hexadecimal Digits

  24. Connection to FPGA Pins

  25. Multiplexing Digits

  26. Time-Multiplexed Seven Segment Display

  27. SSD_DRIVER SEG(6..0) Counter UP Counter UP q(k-1..k-2) Counter UP COUNTER UP Counter UP clk AN OC Counter UP rst OC – One’s Complement

  28. Size of the counter 2k * TCLK ≈ 16 ms fCLK = 100 MHz k = ?

  29. Digital Clock Managers and Variable Clock Frequency

  30. Clock Management • Clock sources are generated off of the FPGA • Clock source needs to enter the FPGA • Clock needs to be “de-jittered” • Clock naturally has non-constant duty cycle and period • Clock needs to reach the rest of the chip

  31. Clock Management • Ideal clock has one frequency • Clock jitter is the undesired deviation in the timing of clock edges • We can see the jitter in the top (yellow) trace • Blue clock is de-jittered

  32. Clock Management ‘0’ clkfx_obufg clkFX DCM_SP BUFG 0 clkfx clk • CLOCK Enters FPGA and enters IBUFG • Output of BUFGMUX goes to the rest of the FPGA • Invert of LOCKED signal is used as a reset for the top-level circuit • To simulate, include the following lines in the library section • library UNISIM; • use UNISIM.vcomponents.all; clk_ibufg clk0_obufg clk100 IBUFG CLOCK clkin clk0 BUFG 1 BUFGMUX BTNL rst_or rst BTNR rst clkfb locked

  33. Digital Clock Manager • DCM can also change clock frequency • CLK2X doubles frequency • CLKDV and CLKFX change the frequency based on the generics (see instantiation)

  34. Digital Clock Manager

  35. Digital Clock Manager

  36. DCM_SP Instantiation (1) DCM_SP_inst : DCM_SP generic map ( CLKDV_DIVIDE => 2.0, -- CLKDV divide value -- (1.5,2,2.5,3,3.5,4,4.5,5,5.5,6,6.5,7,7.5,8,9,10,11,12,13,14,15,16). -- Divide value on CLKFX outputs - D - (1-32) -- Multiply value on CLKFX outputs - M - (2-32) -- CLKIN divide by two (TRUE/FALSE) -- Input clock period specified in nS -- Output phase shift (NONE, FIXED, VARIABLE) -- Feedback source (NONE, 1X, 2X) CLKFX_DIVIDE => …………., CLKFX_MULTIPLY => ………, CLKIN_DIVIDE_BY_2 => FALSE, CLKIN_PERIOD => 10.0, CLKOUT_PHASE_SHIFT => "NONE", CLK_FEEDBACK => "1X”,

  37. DCM_SP Instantiation (2) -- SYSTEM_SYNCHRNOUS or SOURCE_SYNCHRONOUS DESKEW_ADJUST => "SYSTEM_SYNCHRONOUS", -- Unsupported generics - Do not change value DFS_FREQUENCY_MODE => "LOW", DLL_FREQUENCY_MODE => "LOW", DSS_MODE => "NONE", DUTY_CYCLE_CORRECTION => TRUE, FACTORY_JF => X"c080", PHASE_SHIFT => 0, STARTUP_WAIT => FALSE -- Amount of fixed phase shift (-255 to 255) PHASE_SHIFT => 0, -- Delay config DONE until DCM_SP LOCKED (TRUE/FALSE) STARTUP_WAIT => FALSE )

  38. DCM_SP Instantiation (3) port map ( CLK0 => …………., -- 0 degree clock output CLK180 => open, -- 180 degree clock output CLK270 => open, -- 270 degree clock output CLK2X => open, -- 2X clock frequency clock output CLK2X180 => open, -- 2X clock frequency 180 degree clock output CLK90 => open, -- 90 degree clock output CLKDV => open, -- Divided clock output CLKFX => …………, -- Digital Frequency Synthesizer (DFS) output CLKFX180 => open, -- 180 degree CLKFX output LOCKED => …………, -- DCM_SP Lock Output

  39. DCM_SP Instantiation (4) PSDONE => open, -- Phase shift done output STATUS => open, -- DCM_SP status output CLKFB => …………., -- Clock feedback input CLKIN => ………….., -- Clock input DSSEN => ‘0’, -- Unsupported, specify to GND PSCLK => clk_ibufg, -- Phase shift clock input PSEN => ‘0’, -- Phase shift enable PSINCDEC => ‘0’ , -- Phase shift increment/decrement input RST => ………… -- Active high reset input );

  40. Library and Package In order to compile, simulate and synthesize a circuit including DCM_SP, you need to include in the top-level circuit: library UNISIM; use UNISIM.vcomponents.all;

  41. Clock Buffers IBUFG_inst : IBUFG generic map ( IOSTANDARD => "DEFAULT") port map ( O => O, I => I); • Dedicated clock route for reaching a DCM and the rest of the chip • Should be used for a clock port BUFG_inst : BUFG port map ( O => O, I => I); • Dedicated clock route for reaching the rest of the chip at the same time • Should be used for all generated clocks • Output from DCM • Output from clock divider circuits

  42. Clock Multiplexer BUFGMUX_inst : BUFGMUX generic map ( CLK_SEL_TYPE => "SYNC" -- Glitchles ("SYNC") or fast ("ASYNC") clock switch-over ) port map ( O => …….., -- 1-bit output: Clock buffer output I0 => …….., -- 1-bit input: Clock buffer input (S=0) I1 => …….., -- 1-bit input: Clock buffer input (S=1) S => ……… -- 1-bit input: Clock buffer select );

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