Lab 3

1
Lab 3 4 Discussion

• EE414/514 VHDL Design

September 25
2
Lab 3 Hint- Package and Library

• Library IEEE
• use ieee.std_logic_arith.all
• use ieee.std_logic_unsigned.all
• USE IEEE.Std_LOGIC_1164.all entity adder is
     port ( a_in in std_logic_vector (3 downto
  0)          b_in    in std_logic_vector (3
  downto 0)          c_out out std_logic_vector
  (3 downto 0)) end adder architecture
  adder_arch of adder is begin    process (a_in,
  b_in)       variable carry std_logic_vector (4
  downto 0)       variable sum std_logic_vector
  (3 downto 0)    begin       carry (0) '0'
        for i in 0 to 3 loop         sum (i)
  a_in(i) xor b_in(i) xor carry(i)         carry
  (i1) (a_in(i) and b_in(i)) or
                          (b_in(i) and carry (i))
  or                         (carry (i) and
  a_in(i))       end loop       c_out lt sum
     end process end adder_arch

What these two means?
3
Lab 3 Package and Library

• Go to library IEEE, You will find
• PACKAGE std_logic_1164 IS
• FUNCTION "and" ( l std_ulogic r std_ulogic
  ) RETURN UX01
• END std_logic_1164

4
Include Users Design Lib In Lab 3-Make your
library visible to design

• Put two design in the same workspace
• First design a single byte counter
• At the same workspace, design a two-byte counter
• Library
• First create a library with your design-single
  byte counter
• Attach your library to two-byte counter

5
Include Users Design Lib In Lab 3-- Package
6
Include Users Design Lib In Lab 3-- Use Package
7
Connection of Prototype Boards in Lab 4
Expansion Board Dio2
System Board Digilab2
LCD
C O N N E C T O R
XC2S200 -PQ208
7-S LED
JTAG
LED
XC95108
CLOCK
Keypad
Reset
Switch
JTAG
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9
Features of Prototype Board- System Board
Digilab 2

• Spartan2 XC2S200-PQ208
• Select correct devices in Xilinx ISE
• Pin location
• 50 MHZ CLOCK
• Speed of your design
• Source of the clock divider
• Configuration mode JTAG
• Select JTAG clock as startup clock
• Expansion Connector

10
Block Diagram of Prototype Board- System Board
Digilab 2
11
Function Implemented On System Board -Timer

• Timer and Clock Divider Module
• process (CLK, MR)
• begin
• if MR '0' then
• L1 for count_value in 18 downto 0 loop
• QOUT(count_value) lt '0'
• end loop L1
• else
• if (CLK'event and CLK'1') then
• QOUT lt QOUT 1
• end if
• end if
• end process
• SWCLK lt QOUT(18) -- using appropriate taps off
  the counter as divided
• SMCLK lt QOUT(12) -- clock outputs

How to Calculate the factor of Divider ?
12
Function Implemented On System Board - Example
of State Machine

• State Machine,
• State Reset, Start_T, are defined
• COMB_PROC process (CLK, MR) -- This is the
  combinational part
• begin
• if (MR '0') then
• NS lt RESET
• elsif (CLK'event and CLK '1') then
• case NS is -- case appears in () to
  aid in coding
• when RESET gt -- (1)
• if S '0' then
• NS lt START_T -- go to this
  state when the S button is pressed
• else
• NS lt RESET -- otherwise stay
  in this same state.
• end if
• when START_T gt -- (2)transitional states have
  the outputs of the corresponding stable state.
• if S '1' then
• NS lt START
• else
• NS lt START_T

13
Features of Prototype Board- Expansion Board
Dio2

• XC95108 CPLD
• Display Units
• 162 character LCD
• 4 seven-segment LED display
• 16 LED of various colors
• Input Devices
• 15-button keypad
• 8 slide switches

14
Block Diagram of Prototype Board- Expansion
Board Dio2
Bus for exchange data between Dio2 and Digilab2
boards
15
How to Access The Interface Units- LCD

• Signals
• D7-D0 Data Bus
• LCD_R/W
• LCD_RS
• LCD_E

16
How to Access The Interface Units- LCD

• Code
• constant LCD_CMDS LCD_CMDS_T (
• 0 gt "00"X"01", -- Clear The Display
• 1 gt "00"X"38", -- Set interface data width,2
  line,58 dots
• 2 gt "00"X"0c", -- Set display on, cursor off
  and blink off
• 3 gt "00"X"02", -- Return Cursor to Home
• 4 gt "10"X"4f", -- write the display data
  Ohio
• 5 gt "10"X"68",
• 6 gt "10"X"69",
• 7 gt "10"X"6f",

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How to Access The Interface Units-Keypad,
Switches, LED, 7-S LED Display

• All these devices are mapped to corresponding
  address
• Read the data from certain address to obtain the
  status of the input devices, such as keypad and
  switches
• Write the data to certain address to turn on/off
  LED and modify the display data on 7-S LED display

19
How to Access The Interface Units-Keypad,
Switches, LED, 7-S LED Display

• Code
• signal btns std_logic_vector(14 downto 0)
• -- 14 push buttons are mapped to bits of the
  vector
• signal firstTwoNum,LastTwoNum std_logic_vector(7
  downto 0)
• -- There are four 7-s LED display units, the
  first two are mapped to vectorFirstTwoNum
• -- Another two are mapped to vector LastTwoNum
  RSTINgtbtns(10), -- Reset input is mapped to
  A button
• RUNINgtnot btns(11), -- Run input is mapped
  to A button
• Q3 gt FirstTwoNum(3 downto 0), -- Q3 is
  displayed on 7-S LED
• Q2 gt FirstTwoNum(7 downto 4), -- Q2 is
  displayed on 7-S LED
• Q1 gt LastTwoNum(3 downto 0), -- Q1 is
  displayed on 7-S LED
• Q0 gt LastTwoNum(7 downto 4), -- Q0 is
  displayed on 7-S LED

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Q/A