![]() KEYWORDS: to decimal converter, FPGA, Verilog HDL, seven segment display, Cyclone II de1 board. This HDL program is then used to configure an FPGA to implement the designed circuit. In this paper a circuit that can display the decimal equivalent of an n-bit number is designed and it s behavior is described using Verilog Hardware Descriptive Language (HDL). Asma Taha Saadoon University of Baghdad/ Engineering College Computer Engineering Department ABSTRACT It is often needed to have circuits that can display the decimal representation of a number and specifically in this paper on a 7-segment display. ![]() Table 1 describes the SSD Pmod Controller’s ports.1 Design and Implementation of a Generalized N-Digit Binary-To-Decimal Converter on an FPGA Seven-Segment Display Using Verilog Hdl Asst. ![]() This is the frequency of the provided system clock in MHz. The clocking of this SSD Pmod Controller is configured by assigning a value to the GENERIC clk, defined in the ENTITY. This corresponds to a 100 Hz refresh rate, which is fast enough to achieve persistence-of-vision, so it appears that both SSDs are lit simultaneously. It alternates between which of the two SSD value sets it outputs every 5 ms. Since the SSD Pmod has shared input pins for its two SSDs, the SSD Pmod Controller must multiplex the two SSD value sets. Finally, ss_polarity is set to ‘1’, because the SSD Pmod’s 7-segment displays are configured in a common cathode arrangement. bits is set to 7, since 3.322 x digits = 6.644, rounds up to 7 (calculation explained here). For this design, digits is set to 2, since the SSD Pmod has two SSDs to control. Three generic parameters configure the 7-Segment Display Driver for Multiple Digits component when it is instantiated. Finally, it maps the BCD values to SSD segment values. The resulting BCD digits are then disabled if they are leading zeros. It converts this binary number to binary coded decimal (BCD) using the Binary to BCD Converter component. This component operates by first converting the integer input into a standard logic vector to get the binary representation of the integer. The SSD Pmod Controller uses the 7-Segment Display Driver for Multiple Digits component available on eewiki to take an input integer and determine the segment values required for each of the SSDs on the SSD Pmod. Operations Performed Determining SSD Segment Values This component was designed using Vivado 2017.2.įigure 2. It inputs a number from user logic and outputs the necessary signals to display that number on the Pmod’s 7-segment displays. As shown, the SSD Pmod Controller connects directly to the SSD Pmod through the FPGA’s output ports. Figure 2 illustrates a typical example of this SSD Pmod Controller integrated into a system. This details a VHDL component that handles interfacing to the Digilent’s SSD Pmod, shown in Figure 1. Handles multiplexing between the two displays’ shared input pins on the Pmod.Displays a 2-digit integer on the two 7-segment displays.VHDL source code of a streamlined interface to Digilent’s 7-Segment Displays Pmod (PmodSSD).Other files that must be included in the project:ħ-Segment Display Driver for Multiple Digits: seven_segments.vhd (5.0 KB)īinary to BCD Converter: binary_to_bcd.vhd (5.8 KB)īinary to BCD Digit Converter: binary_to_bcd_digit.vhd (3.2 KB)īCD to 7-Segment Mapping: bcd_to_7seg_display.vhd (2.0 KB) Features 7-Segment Displays Pmod Controller: pmod_seven_segments.vhd (4.4 KB)
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