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Introduction to FPGA Part 4 – Clocks and Procedural Assignments | Digi-Key Electronics

A field-programmable gate array (FPGA) is an integrated circuit (IC) that allows you execute personalized digital circuits. You can use an FPGA to develop enhanced electronic reasoning for things like digital signal processing (DSP), maker understanding, as well as cryptocurrency mining. You can typically apply whole processors using its electronic reasoning because of the FPGA’s flexibility. You can discover FPGAs in customer electronic devices, satellites, and also in web servers made use of to execute specialized estimations.

In this series, we will certainly see how an FPGA works and also show just how to produce custom-made electronic reasoning using the Verilog equipment summary language (HDL).

Previously, we demonstrated how to make use of constant task declarations to develop personalized electronic circuits with logic gates making use of Verilog ( In this episode, we show how to utilize procedural assignments to produce consecutive equipment reasoning.

The remedy to the difficulty at the end of the episode can be found right here:

All code instances and services for this series can be found below:

We begin by showing just how the D flip-flop in an FPGA reasoning cell can be made use of to store a 1-bit worth for one or (potentially) a lot more clock cycles. Multiple D flip-flops can be combined with combinational logic gateways to produce hardware circuits that run sequentially. We can regulate this consecutive logic with Verilog blocks referred to as “step-by-step job declarations.”

Next, we demonstrate a step-by-step project declaration by creating a straightforward 4-bit counter inside of an “always obstruct.” Each time a switch is pressed, the worth increments by 1. The counter worth is revealed on the LEDs (in binary).

As an outcome, the counter will likely skip worths each switch press. You would need to execute switch debounce wiring (either in equipment or in HDL) to correct for this actions.

Your challenge is to create a clock divider for the onboard 12 MHz oscillator (presuming you are making use of the iCEstick, the 12 MHz oscillator is linked to pin 21). The clock needs to be separated to 1 Hz, as well as this brand-new clock signal need to run the counter received the video clip. When per secondly, the brand-new counter should increment on its very own.

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