Control Systems & PLC's

Input Nand

Fasten our Computer Skills through the Help of a Nand Drive

Nand drives are flash memory drives that are known for their:

? high-capacity

? solid-state

? high-speed

You can find this Nand flash everywhere these days. Through devices like the USB flash drive, iPod Nano and various other flash card-based devices in the form of digital cameras, GPS navigators and smart phones, high-density Nand has gone mainstream.

What most users don't realize is the fact that Nand storage, though in its "solid-state" actually relies on an inherently-flowed and fragile technology, particularly when it comes to storing all these "bits and bytes". With the Nand controller, a relatively small type of software, it can render Nand errors virtually invisible to the end user. This can make your iPod and other new devices work like a champ.

Thanks to new advances in technology, these Nand drives have become the most preferred as the latest drive for almost all laptop computers. If you will compare Nand with other flash memory, Nand drives are favored with several noteworthy advantages.

"Nand" is the term referring to the architecture of neither chip. It can be different from NOR (NOR OR) flash memory. This memory is considered as the most widely used in devices where small programs are executed in place as compared to being written in Random Access Memory (RAM). Cell phones, PDAs and similar devices are known to function better through the help of NOR flash memory. This is why it is regarded as ideal for applications requiring less memory. It is also known for performing most of the work on unchanging code such as boot directions and operating systems.

There are several noted advantages of Nand drives. This is especially if you will compare them with more traditional hard drives. It is the solid-state nature of these drives that is considered its core advantage. Solid-state means: Nand drives that don't have any moving parts to break down. Just like USB flash drives, these Nand drives don't make any noise while they function.

The fact that Nand drives only consume less power makes it essential for laptop users. When it comes to changing data, these Nand harddrives can be superior to NOR flash memory. Since Nand is more cost effective and the chips are smaller, more memory can be packed into the same size space.

Nand hard drives are also capable of erasing faster as compared to NOR flash memory. This enables Nand to write faster. The thing with flash memory is that there is still a need to erase memory blocks before writing on them. Nand also features a longer lifespan with more erase cycles. These factors, when combined, make Nand flash memory a more logical choice for high-capacity storage as well as for manipulating changing data.

With decades of memory engineering experience and with the industry-leading compute-quality 34nm Nand flash memory manufacturing process, Intel Mainstream SATA Solid-State Drives are designed to deliver outstanding performance. It features the latest-generation native SATA interface having an advanced architecture as it employs 10 parallel Nand flash channels that are equipped with multi-level cell as well as flash memory. With powerful Native Command Queuing, up to 32 concurrent operations is enabled. It is also noted that Intel Mainstream SATA SSDs can deliver higher input/output per second as compared to the performance of other SSDs on the market today.

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NAND Gate question?

Truth table:

A B C Y
0 0 0 0
0 0 1 1
0 1 0 0
0 1 1 1
1 0 0 1
1 0 1 0
1 1 0 1
1 1 1 0

A, B, C(input), Y(output)

a) Plot a K-map for the function and derive the min sum-of-product Boolean expression using K-map.

Ans: Y = AC’ +A’C

b) Redesign the circuit using only NAND gate. Show the expression and draw the logic circuit.

I having trouble on part b. Your help is greatly appreciated.

Tks!!!

a) K-MAP in SOP form is correct: AC'+A'C

b) to make the circuit using NAND gates, you will need 5.
A' and C' will require both inputs tied together (2 gates)
then make A'C and AC' (2 more gates) and send the outputs to one last NAND gate.

Just remember how to make NOT AND OR gates from NAND.

There is software to help you draw and create the functions from kmap. I recommend the simple version from karnaugh.shuriksoft.com, it will create the diagrams in POS/SOP using AND/OR and NAND gates.

VLSI Tutorial 2: Two-input NAND gate using Mentor Graphics tools (Design Architect and ELDOSpice)