Usb Eprom

Thanks for visiting our site!
Usb Eprom
Checkout Ebay Auctions For The Cheapest Prices

Check out Amazon:

Account limit of 2000 requests per hour exceeded.

Here are some more information for Usb Eprom:

Random Access Memory, commonly known as RAM, is an essential part of data transfer and storage for every computer. Allowing for every byte of data to be accessed, from data values to complex computer programs, RAM proves its worth each time you access something or more to the point anything on your computer. The random in RAM simply means that any part of the data can be accessed and returned in constant time. Constant time is the amount of time needed to bring forth the information requested when the amount of data being brought forth is not factor. RAM usually deals with volatile types of memory, which is deleted when the computer is turned off.

Read-Only Memory, commonly known as ROM, is another form of RAM. Information and data stored in ROM is semi-permanently stored, in which that it is difficult and time consuming to modify. ROM is normally used to store and distribute firmware. Firmware consists of software usually tied directly to a component of hardware, such as a mouse driver, that doesn't require excessive updates. Mask ROM is the oldest form of ROM in a solid state; meaning that it can never be modified. More advanced ROM, such as EPROM and EEPROM, have the capability to be erased and re-programmed multiple times. Because the task of re-programming is a long and slow process that rarely occurs, and it often limits individual memory locations from being written by random access which is possible with reading ROM.

Further extensions of RAM are DRAM and SRAM. DRAM (Dynamic Random Access) uses separate capacitors to store each bit of data within an integrated circuit. DRAMs capacitors slowly discharge energy so their power must be periodically refreshed. With each bit only needing one capacitor DRAM can reach a much greater density than SRAM. SRAM (Static Random Access Memory) requires six capacitors per bit, but unlike DRAM refreshing is not necessary. DRAM and SRAM are listed as volatile memory because its data is lost when the computer loses power, however for a short time after power lose DRAMs data can still be retrieved.

SDRAM (Synchronous Dynamic Random Access Memory) is classified as solid state computer memory; meaning it relies completely on semiconductors, transistors, and chips. SDRAM reacts as quickly as possible as the input it receives changes. (Ex. Typing in a new web address and pushing enter, while the current web page is still loading, SDRAM stops loading the initial site and starts loading the new site as quickly as it can, this process is also known as pipelining.) Reacting to data changes so quickly is possible because SDRAM is directly connected to the computers processor.

Pipelining allows for a set amount of time to pass before the requested data is shown. The delay between when the data is requested and when the data is shown is known as latency. Latency occurs because the computers Central Processing Unit, also known as the CPU, is a great deal faster than the SDRAM thus the computer is waiting for the SDRAM to catch up before it continues. Latency is one of the most important factors in choosing your computers SDRAM.

Victor Epand is an expert consultant for computer memory, PC supplies, and computer games. When shopping, we recommend the best online stores for PC supplies, computer accessories, computer memory, Random Access Memory.

Know Why a Pen Drive is a Necessity These Days

In the age of computers it is essential to know about the various accessories that are used in a computer. Pen drive is one such accessory which has made the carrying and transfer of files from one machine to another very easy and fast. In a `pen` you can literally carry your entire office.

Pen drive is integrated with USB (Universal Serial Bus) interface. It is a NAND (which stands for `Not and`) type of flash memory technology that excels at reading, writing and erasing data from flash memory. Their size ranges from 1 inch to 4 inches or 2.5 cm to 10 cm. They are much smaller than floppy discs and weighs less than 2 oz.

The storage capacity of a general pen drive ranges between 64 MB to 64GB. While they show a steady increase in storage and price per gigabyte, some pen drives have a capacity of one million re-writes or erase cycles with a ten year data retention capacity when connected to USB 1.1 or USB 2.0.

The major advantages of USB pen drives over other portable storage devices such as floppy discs or DVD/CD is their compact shape and size, they operate faster and can hold more data. As the pen drives are not associated with any moving parts, they operate more reliably.

In recent times, the more updated computers lack floppy disc drives while USB ports appear in every current mainstream PCs and Laptops. Most of the pen drives use the USB mass storage system which can be supported by any modern Operating System such as Windows, Mac OSX, Linux and other Unix oriented systems. Pen drives using USB ports function faster than the optical disk drives.

The pen drive contains a minute circuit board which is protected by plastic, rubberized or metal case. Such sturdy protection shields the pen drive while being carried in the pocket or key chain. The USB connector is shielded by a removable cap or it can be automatically retracted into the body of the drive. This prevents it from being damaged even when exposed.

Most of the normal pen drives use standard A - USB connection. These storage units combine a number of older technologies with low cost, low power consumption and small size possible now by the recent advancements in micro processor technology. The memory storage is based on earlier EPROM and EEPROM technologies.

Hardware designers later developed pen drives which carried their own micro processor system. These are the miniaturized version. This form of miniaturization was facilitated by the development of high speed serial data interface. In computers using pen drive, the controller system has full control over the stored information bank.

However, the actual EEPROM writing and erasing procedures are still quite similar to the earlier mode of operation. The fastest pen drive currently available use dual channel controller. The over all file transfer speed varies considerably and are measured in megabytes or megabits per second. The essential components of a pen drive are male type USB connector, USB mass storage controller, NAND flash memory chip and crystal oscillator controlling the device`s data output.

Additional components are test pins and jumpers, LED`s to indicate data transfer, write protecting switches, unpopulated space, USB connector cap or a cover and a transport aid. The USB pen drives have been integrated into other commonly carried items such as watches, pens and can even be fitted into novelty toy cars.

Their small size and affordable price makes these drives increasingly popular peripherals. Pen drives are primarily used for data transfer, secure data storage in application and software files. They are particularly popular among system and network administrators and also enjoy notable success in PC repair field as a means to transfer data recovery and anti-virus software.

About the Author

You can have access to portuguese articles about pen drives from page
Pen_Drive
Roberto Sedycias works as IT consultant for
www.polomercantil.com.br

IC programmers................................?

picked up a catalog from Jameco electronics and the have these IC programmers, i know what the individual parts are and their usage is obvious, but, what do i need before the thing can interface with the memory for example: "37000+ device/48 pin usb stnd alone gang programmer, i understand this model will support all types of usb and flash memory, so the question becomes, what basic circuitry do i need in between the memory ad the programmer? for examples, eprom, eeprom, serial eprom, paged eprom, serial prom, flash eprom, (nor and nand), nvram spld, cpld, epld, mcu, micro controller, sram, and standar logic devices down to 1.5 v.

i will be posting a question in programming on those individual types as well.

What are you trying to do? If you're trying to program a flash chip, you can plug the flash chip directly into the programmer, assuming the programmer supports the chip. This is normally only useful for developing prototypes and homebrew projects. And even for that, it's largely obsolete since most homebrew microcontrollers today have their own flash memory.

If you had a serial eeprom you wanted to program, you would drop it in the programmer's socket, tell the programmer's software what to put on the EEPROM, push 'program', and then remove the programmed EEPROM. But for most applications, you could just program the EEPROM in the final circuit anyway.

Now, microcontrollers with embedded EEPROM may be best programmed in a programmer.

COMMENTARY: From Microprocessor to Microcontroller to ???
Meng He and Andrew Siska look at the evolution of embedded processing, and explore the implications of programmable system on chip architectures to its future direction.. System-on-Chip - Evolution - Hardware - Microcontroller - Business

Thanks for visiting!