lab1_Verilog精品文档说明书.pdfVIP

Laboratory Exercise 1 Switches, Lights, and Multiplexers The purpose of this exercise is to learn how to connect simple input and output devices to an FPGA chip and implement a circuit that uses these devices. We will use the switches SW17− 0 on the DE2-115 board as inputs to the circuit. We will use light emitting diodes (LEDs) and 7-segment displays as output devices. Part I The DE2-115 board provides 18 toggle switches, called SW17− 0 , that can be used as inputs to a circuit, and 18 red lights, called LEDR17− 0 , that can be used to display output values. Figure 1 shows a simple Verilog module that uses these switches and shows their states on the LEDs. Since there are 18 switches and lights it is convenient to represent them as vectors in the Verilog code, as shown. We have used a single assignment statement for all 18 LEDR outputs, which is equivalent to the individual assignments assign LEDR[17] = SW[17]; assign LEDR[16] = SW[16]; . . . assign LEDR[0] = SW[0]; The DE2-115 board has hardwired connections between its FPGA chip and the switches and lights. To use SW17− 0 and LEDR17− 0 it is necessary to include in your Quartus II project the correct pin assignments, which are given in the DE2-115 User Manual. For example, the manual specifies that SW0 is connected to the FPGA pin AB28 and LEDR 0 is connected to pin G19. A good way to make the required pin assignments is to import into the Quartus II software the file called DE2-115_ pin_assignments.csv, which is provided on the DE2-115 System CD and in the University Program section of Altera’s web site. The procedure for making pin assignments is described in the tutorial Quartus II Introduction using Verilog