In computing, bit is the basic unit of information. Simply, a bit can be seen as a variable that can take only one of two possible values. Byte is also a unit of information used in computing. One byte is equal to eight bits. In practice, bits can be implemented in several ways.
Typically, it is implemented using an electrical voltage. In modern memory devices, such as dynamic random access memories and flash memories, two levels of charge in a capacitor are used to implement a bit. In optical disks, two values of a bit are represented using the availability or non availability of a very small pit on a surface that is reflective.
A Byte is also a unit of information used in computing. Even though there is no specific reason for choosing eight bits for a byte, reasons such as the usage of eight bits to encode characters in a computer and the usage of eight or fewer bits to represent variables in many applications played a role in accepting 8 bits as a single unit.
A byte can represent values from 0 to In computing, bit is the basic unit of information, whereas Byte is a unit of information, which is equal to eight bits. A bit can represent only two values 0 or 1whereas a byte can represent 2 8 different values. Bits are grouped in to bytes to improve the efficiency of hard disks and other memory devices, and for the easiness of comprehending information. Indika, BSc. Leave a Reply Cancel reply.Answer: Bits and Bytes both measure amounts of data.
However, they are typically used in two different contexts. Bits, kilobits Kbpsand megabits Mbps are most often used to measure data transfer speeds. This may refer to how fast you are downloading a file, or how fast your Internet connection is. For example, if you are downloading a file on cable modemyour download speed might be Kbps. This is much faster than a dial-up modem, which maxes out at 56Kbps. Bytes, on the other hand, are used to measure data storage. The other important difference is that bytes contain eight bits of data.
Therefore, a Kbps download is only transferring 30KB of data per second. However, kilobytes per second is not as commonly used as kilobits per second for measuring data transfer speeds.
After all, using kilobits per second Kbps makes your connection sound eight times faster! It is important to know that bytes are abbreviated with a capital B, where as bits use a lowercase b.
Therefore, Mbps is megabits per second, and MBps is megabytes per second. So 8Mbps is equal to 1MBps. What is the difference between functional and technical obsolescence? What are kibibytes, mebibytes, and gibibytes?
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So far I have studied verilog HDL reg  a  means array of 4 a's and each a is of 8 bit wide like. There is no difference between the two if all you do is access the array one element at a time. There is a difference when you do operations on the array as a whole. In SystemVerilog, there are many more operations the ordering could affect, like casting the array to a bit integer.
The left index becomes the high order byte. Learn more. What is the difference between reg  a  and reg  a  Ask Question. Asked 1 year, 7 months ago. Active 1 year, 7 months ago. Viewed 1k times.
How Do Bits, Bytes, Megabytes, Megabits, and Gigabits Differ?
So far I have studied verilog HDL reg  a  means array of 4 a's and each a is of 8 bit wide like am i right? Active Oldest Votes. Is the same thing, the order of the number can be either ascending or descending. Andrea Bellizzi Andrea Bellizzi 3 3 silver badges 10 10 bronze badges. You get a warning from Cadence if you use reg  a  but not with reg  a . What warning did you get? Can't remember. It was about seven years ago I just don't like warnings so I swapped the indices around.
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Read on to learn the difference and figure out what broadband speed you need. Connection speeds and data sizes are measured differently, but people tend refer to them both as 'megs'. The problem is that the word 'meg' actually refers to two very different values: megabits and megabytes. Aren't they the same thing? Actually no, there's a big difference between a bit and a byte. A byte is much bigger — eight times bigger, to be exact, with eight bits in every byte.
By extension, there are eight megabits in every megabyte, and one gigabyte is eight times bigger than one gigabit. Data sizes are usually measured in 'bytes', and broadband speeds are measured in 'bits'. Based on the file size and your connection speed, you can estimate how long it'll take you to download something. Let's say you find a file online that is 17 megabytes MB in size, and you want to download it using your 17 megabit per second Mbps broadband connection.
This won't take one second; it will take eight times one second because a megabyte is eight times bigger than a megabit. So in theory — and with a perfect speed — it should take eight seconds to download. Before you start reaching for your calculator, read our guide to download times. We've pulled together a list of the most common broadband speeds and file sizes to give you an idea of how long it will take to download films, TV series, songs and more.
From how it's written. A byte is an uppercase 'B' and a bit is a lowercase 'b'. If it says MB, all capitals, then it is a megabyte. If it says Mb, then it is a megabit.
There is one exception to this, of course, and it is the symbol for kilobit, which is 'kb', all lowercase. It's easy to figure out based on common sense: an uppercase 'B' is physically larger than a lowercase 'b', and a byte is larger than a bit. While there are many different file sizes, most of us only need to know a little bit no pun intended of prefixes. Here are the most common ones.
A megabyte MB is 1, kilobytes. A gigabyte GB is 1, megabytes. A terabyte TB is 1, gigabytes. A megabit Mb is 1, kilobits. A gigabit Gb is 1, megabits. A terabit Tb is 1, gigabits. Don't forget! There are eight bits in a byte, so to translate from one to the other, you can multiply or divide by eight. For example, if you want to transfer 38MB across a 38 Mbps connection, it will take eight seconds.A megabit is a unit of measurement for data size, most often used in discussions of data transfer.
Megabits are expressed as Mb or Mbit when talking about digital storage, or Mbps megabits per second in the context of data transfer rates. All of these abbreviations are expressed with a lowercase 'b. It takes eight megabits to make a megabyte abbreviated as MB. Megabits and megabytes sound similar and their abbreviations use the same letters but they don't mean the same thing. It's important to distinguish between the two when you're calculating things like the speed of your internet connection and the size of a file or hard drive.
For example, an internet speed test can measure your network's speed at The same test can say that the available bandwidth is 2. As another example, if a file you're downloading is MB, it's also 6, Mb.
A bit is a binary digit or small unit of computerized data. It's smaller than the size of a single character in an email but, for simplicity's sake, think of it as the same size as a text character. A megabit, then, is approximately the size of one million characters. Here are some sample conversions:.
A quick way to figure a conversion between megabits and megabytes is to use Google. Knowing that megabytes and megabits are two different things is important mainly when you're dealing with your internet connection.
That's typically the only time you see megabits mentioned. At a quick glance, they may seem identical and you might just pick whichever one is cheapest. Choosing the cheaper service would likely mean you'd buy ServiceA but, if you needed quicker speeds, you may want the more expensive one instead. That's why it's important to recognize this difference.
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Beyond megabits and megabytes, we enter the territory of much bigger file sizes of gigabytes GBterabytes TBand petabytes PBwhich are additional terms used to describe data storage but are much larger than megabytes.
Tweet Share Email. More from Lifewire.Before we go into units of measurement, we have to look at how computer data works. Pretty much every piece of computing technology these days consists of transistor electronics.
In our everyday lives, we use the decimal counting system — every 10 numbers increase the next magnitude. The binary counting system works the same way, except its base is 2 instead of 10, i. A bit is the basic unit of information in computing and data systems, and also functions as a binary digit.
Basically, a bit is a placeholder for a digital signal 0 or 1. Bits can be sent and received over large distances through cables or wireless connections as a series of high and low signals changing at a certain frequencythey can be saved in storage devices as a high or low particle charge and can be used to measure how much data a single device can process at a time.
These decimal prefixes usually represent a thousand, a million, and a billion units. According to what is basically the galactic council of units and measurements ISO and IECsuch a measuring system is incorrect, however, the Solid State Technology Association JEDEC felt like they wanted their own interpretation of this numbering system in their own field. This causes some difference between advertised and actual performance and capacity of computer devices, because manufacturers display the easier to understand decimal system, while computer read actual performance in binary prefixes.
Bit prefix Value Kilobit, kbit bits 1' 2 10 bits Megabit, Mbit kilobits 1'' 2 20 bits Gigabit, Gbit megabits 1''' 2 30 bits Terabit, Tbit gigabits 1'''' 2 40 bits. A byte is the smallest addressable amount of data a computer can actually use. Bytes are basically just more convenient packs of bits. Byte prefix Value Kibibyte, kiB bytes 1' 2 10 bytes Mebibyte, MiB kibibytes 1'' 2 20 bytes Gibibyte, GiB mebibytes 1''' 2 30 bytes Tebibyte, TiB gibibytes 1'''' 2 40 bytes Pebibyte, PiB tebibytes 1''''' 2 50 bytes Exbibyte, EiB pebibytes 1'''''' 2 60 bytes Instead, computers use the JEDEC system, which creates confusion in byte measurements as well.
The most notable case here would be advertised hard drive capacities being higher than the real ones on your computer. Byte prefix Value Kilobyte, kB bytes 1' 2 10 bytes Megabyte, MB kilobytes 1'' 2 20 bytes Gigabyte, GB megabytes 1''' 2 30 bytes Terabyte, TB gigabytes 1'''' 2 40 bytes Petabyte, PB terabytes 1''''' 2 50 bytes Exabyte, EB petabytes 1'''''' 2 60 bytes.
Bits are mainly used to describe data interface speeds, like internet and port speeds. Here are some examples of data speeds being measured in bits:. Interface Bandwidth USB 2. Only 6 bits of an entire byte could be transferred in a time period, for example, so using bits reduces the error here, making it technically the better choice.
Difference Between Megabyte Gigabyte and Terabyte
Bytes are used pretty much everywhere else — in memory unit performance, storage unit capacity and transfer speeds, as well as file sizes you see on your computer. The only thing to really keep an eye out is what exact unit is being used and not to mix the two up, because the eight-fold difference between bits and bytes is no laughing matter.
Exclusive reviews and gaming guides. Contact About Privacy Adverstise with us Giveaways. The Science Behind Data Before we go into units of measurement, we have to look at how computer data works. What Is a Bit? JEDEC bit prefixes. Raid 0 Configuration — What Is It? Stop Killing Your Laptop! Please enter your comment! Please enter your name here. You have entered an incorrect email address! Best Thunderbolt Devices of Top 11 Best Xbox One Headsets of Best Internal Hard Drives Top 9 PS4 Compatible Keyboards.
The earlier optimisation for the simulator can be done through the context of its usage. The type bit and byte have also been created that can only hold 2 states 0 or 1 no x or z. Using these types offers a small speed improvement but I would recommend not using them in RTL as your verification may miss uninitialized values or critical resets.
The usage of bit and byte would be more common in testbench components, but can lead to issues in case of having to drive x's to stimulate data corruption and recovery. At the time of writing I was under the impression that logic could not be used for tristate, I am unable to find the original paper that I based this on.
Until further updates, comments or edits, I revoke my assertion that logic can not be used to create tri-state lines. The tri type has been added, for explicitly defining a tri-state line. It is based on the properties of a wirelogic is based on the properties of a reg. If you no longer have to support backwards compatibility Verilog then I would recommend switching to using logic and tri.
Using logic aids re-factoring and and tri reflects the design intent of a tristate line. The choice of the name reg turned out to be a mistakebecause the existence of registers is instead inferred based on how assignments are performed.
Due to this, use of reg is essentially deprecated in favor of logicwhich is actually the same type. Practically speaking, for RTL it usually doesn't matter whether you declare with regor logicor wire.
However, if you have to make an explicit declaration of a 4-state type as opposed to when you don'tyou should typically choose logic since that is what is intended by the language. Logic data type doesn't permit multiple driver. The last assignment wins in case of multiple assignment. Logic data type simply assign the last assignment value. These data types appear inside the always or initial blocks and store values i. I agree that they can behave identical as Morgan mentioned, but they can be imagined as a piece of hard wire, the value of which changes only the value at the other end or the source changes.
Learn more. Difference of SystemVerilog data types reg, logic, bit Ask Question. Asked 7 years, 5 months ago. Active 2 years, 8 months ago. Viewed 74k times. There are different data types in systemverilog that can be used like the following: reg  data; logic  data; bit  data; How does the three of them differ? Active Oldest Votes. This introduces logic which can be used in place of wire and reg.Understanding the differences between 8bit, 16bit, 32bit, and 64bit -- Arrow Tech Trivia