Why Gray code is used in asynchronous FIFO?

tryey gray code Most logic designers designing FIFOs do NOT even consider saving power. You use gray code counters in asynchronous FIFO design where the write pointer is in a different clock domain than the read pointer, AND, when the pointers are multi-bit. This is to correctly detect full and empty conditions.

Why is asynchronous FIFO used?

The Asynchronous FIFO is a First-In-First-Out memory queue with control logic that performs man- agement of the read and write pointers, generation of status flags, and optional handshake signals for interfacing with the user logic.

What is synchronous FIFO and asynchronous FIFO?

FIFO can be either synchronous or asynchronous. The basic difference between them is that the entire operation of synchronous FIFO is entirely dependent on the clock where as the write operation and read operation of asynchronous FIFO are asynchronous to each other.

When crossing clock domains Designers often resort to GREY code Why?

Use gray codes counters The easiest way to pass count values between clock domains is to use gray code counters. These counters only change one bit at a time so they do not suffer from multi-bit synchronization problems.

How do you convert binary code to gray code?

For least significant bit (LSB) g0=b0⊕b1, g1=b1⊕b2, g2=b1⊕b2 , …. g(n-1)=b(n-1)⊕bn, gn=bn. Example −Convert Binary number 111010 into Gray code….Conversion of Binary to Gray Code.

What is the purpose of gray code?

Gray codes are widely used to prevent spurious output from electromechanical switches and to facilitate error correction in digital communications such as digital terrestrial television and some cable TV systems.

What is a synchronous FIFO?

A Synchronous FIFO is a First-In-First-Out queue in which there is a single clock pulse for both data write and data read. This kind of FIFO is termed as Synchronous because the rate of read and write operations are same. Basically Synchronous FIFO are used for High speed systems because of their high operating speed.

How does an asynchronous FIFO work?

An asynchronous FIFO refers to a FIFO design where data values are written to a FIFO buffer from one clock domain and the data values are read from the same FIFO buffer from another clock domain, where the two clock domains are asynchronous to each other.

How does FIFO buffer work?

A FIFO buffer stores data on a first-in, first-out basis. Data is written to the “head” of the buffer and read from the “tail”. When the head or tail reaches the end of the memory array, it wraps around to the beginning. If the tail runs into the head, the buffer is empty.

What is synchronous FIFO?

A Synchronous FIFO is a First-In-First-Out queue in which there is a single clock pulse for both data write and data read. In Synchronous FIFO the read and write operations are performed at the same rate. Basically Synchronous FIFO are used for High speed systems because of their high operating speed.