{"id":7388,"date":"2015-06-01T20:00:15","date_gmt":"2015-06-02T03:00:15","guid":{"rendered":"https:\/\/blog.digilentinc.com\/?p=7388"},"modified":"2025-01-30T15:19:39","modified_gmt":"2025-01-30T23:19:39","slug":"coding-logic-gates","status":"publish","type":"post","link":"https:\/\/digilent.com\/blog\/coding-logic-gates\/","title":{"rendered":"Coding Logic Gates"},"content":{"rendered":"

Earlier today, Josh\u00a0(a\u00a0fellow intern and blog contributor) wrote a blog post about logic gates<\/a>. After reading through Josh’s post and gaining an understanding of the concepts and basic functions of those gates, I figured now would be the perfect time to learn some code. I am going to go over each logic gate and it’s code in Verilog<\/span> (a hardware language), VHDL<\/span> (another hardware language) and C<\/span> (software language). If you need a refresher on what a hardware language is, you can read about Verilog vs. VHDL<\/a>. Each gate is shown below with the code for each language in their respective colors.<\/p>\n

 <\/p>\n

NOT:<\/strong><\/p>\n

\"The<\/a>
The NOT\u00a0gate.<\/figcaption><\/figure>\n

\u00a0 \u00a0 \u00a0assign Y = ~A;<\/span><\/p>\n

\u00a0 \u00a0 \u00a0Y <= NOT A;<\/span><\/p>\n

\u00a0 \u00a0 \u00a0Y = !A;<\/span><\/p>\n

AND:<\/strong><\/p>\n

\"The<\/a>
The AND\u00a0gate.<\/figcaption><\/figure>\n

\u00a0 \u00a0 assign Y = A & B<\/span>;<\/span><\/p>\n

\u00a0 \u00a0 Y <= A\u00a0AND\u00a0B;<\/span><\/p>\n

\u00a0 \u00a0 Y\u00a0= A && B;<\/span><\/p>\n

NAND<\/strong>:<\/p>\n

\"The<\/a>
The NAND\u00a0gate.<\/figcaption><\/figure>\n

\u00a0 \u00a0assign Y = ~(A & B);<\/span><\/p>\n

\u00a0 \u00a0Y <= A NAND\u00a0B;<\/span><\/p>\n

\u00a0 \u00a0Y = !(A && B);<\/span><\/p>\n

OR:<\/strong><\/p>\n

\"The<\/a>
The OR\u00a0gate.<\/figcaption><\/figure>\n

\u00a0 \u00a0assign Y = A|B;<\/span><\/p>\n

\u00a0 \u00a0Y <= A OR\u00a0B;<\/span><\/p>\n

\u00a0 \u00a0Y = A || B;<\/span><\/p>\n

NOR:<\/strong><\/p>\n

\"The<\/a>
The NOR\u00a0gate.<\/figcaption><\/figure>\n

\u00a0 \u00a0 assign Y = ~(A|B);<\/span><\/p>\n

\u00a0 \u00a0 Y <= A NOR\u00a0B;<\/span><\/p>\n

\u00a0 \u00a0 Y = ! (A || B);<\/span><\/p>\n

XOR:<\/strong><\/p>\n

\"The<\/a>
The XOR\u00a0gate.<\/figcaption><\/figure>\n

\u00a0 \u00a0assign Y = A^B;<\/span><\/p>\n

\u00a0 \u00a0Y <= A\u00a0XOR\u00a0B;<\/span><\/p>\n

\u00a0 \u00a0Y = ((!A) && B) || (A && (!B));<\/span><\/p>\n

XNOR:<\/strong><\/p>\n

\"The<\/a>
The XNOR\u00a0gate.<\/figcaption><\/figure>\n

\u00a0 \u00a0\u00a0assign Y = A^B;<\/span><\/p>\n

\u00a0 \u00a0Y <= A XNOR\u00a0B;<\/span><\/p>\n

\u00a0 \u00a0Y = !((!A) && B) || (A && (!B));<\/span><\/p>\n

As you can see from the examples of all of these gates, Verilog and VHDL aren’t all that different from C in terms of syntax. In fact, C has bitwise logic operators that are the same as those of the hardware languages. However, bitwise operations aren’t very common in C. Unfortunately, C doesn’t have a symbol for XOR and XNOR, so those had to be made out of AND, OR, and NOT\u00a0gates.<\/p>\n

This content is relevant to the Basys 3<\/a>, \u00a0Nexys A7<\/a>, Cmod A7<\/a>,\u00a0and Cmod S7.<\/a> All can be found on our FPGA product page<\/a>.<\/p>\n

-2<\/span><\/a><\/div><\/div>
<\/div><\/div>
<\/div>","protected":false},"excerpt":{"rendered":"

Earlier today, Josh (a fellow intern and blog contributor) wrote a blog post about logic gates. After reading through Josh’s post and gaining an understanding of the concepts and basic functions of those gates, I figured now would be the perfect time to learn some code. I am going to go over each logic gate and it’s code in Verilog (a hardware language), VHDL (another hardware language) and C (software language). <\/p>\n","protected":false},"author":18,"featured_media":7398,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4323,1563],"tags":[],"ppma_author":[4466],"class_list":["post-7388","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-software","category-guide"],"jetpack_featured_media_url":"https:\/\/digilent.com\/blog\/wp-content\/uploads\/2015\/06\/feature.png","authors":[{"term_id":4466,"user_id":18,"is_guest":0,"slug":"kaitlyn","display_name":"Kaitlyn Franz","avatar_url":"https:\/\/secure.gravatar.com\/avatar\/3f16f6159d3666c6fd05a4b73a18c286?s=96&d=mm&r=g","author_category":"","user_url":"","last_name":"Franz","last_name_2":"","first_name":"Kaitlyn","first_name_2":"","job_title":"","description":""}],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/digilent.com\/blog\/wp-json\/wp\/v2\/posts\/7388","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/digilent.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/digilent.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/digilent.com\/blog\/wp-json\/wp\/v2\/users\/18"}],"replies":[{"embeddable":true,"href":"https:\/\/digilent.com\/blog\/wp-json\/wp\/v2\/comments?post=7388"}],"version-history":[{"count":3,"href":"https:\/\/digilent.com\/blog\/wp-json\/wp\/v2\/posts\/7388\/revisions"}],"predecessor-version":[{"id":31326,"href":"https:\/\/digilent.com\/blog\/wp-json\/wp\/v2\/posts\/7388\/revisions\/31326"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/digilent.com\/blog\/wp-json\/wp\/v2\/media\/7398"}],"wp:attachment":[{"href":"https:\/\/digilent.com\/blog\/wp-json\/wp\/v2\/media?parent=7388"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/digilent.com\/blog\/wp-json\/wp\/v2\/categories?post=7388"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/digilent.com\/blog\/wp-json\/wp\/v2\/tags?post=7388"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/digilent.com\/blog\/wp-json\/wp\/v2\/ppma_author?post=7388"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}