Table of Contents
What is difference between synchronous 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.
What is a asynchronous FIFO?
The Asynchronous FIFO is a First-In-First-Out memory queue with control logic that performs management of the read and write pointers, generation of status flags, and optional handshake signals for interfacing with the user logic.
What is the use of synchronous FIFO?
Renesas synchronous FIFOs are typically used for synchronization of CPU and other computer hardware. FIFOs are generally implemented as a circular queue, and thus have a read and write pointer. Synchronous FIFOs use clocks for reading and writing, while asynchronous FIFOs are usually controlled by asynchronous signals.
How do you verify asynchronous FIFO?
- Only read.
- Only write.
- Read and write simultaneously.
- write full.
- read empty.
- full and empty are mutually exclusive.
- simultaneously write_full and read_empty are active ( When read-side-clk is deactivated and other side it is writing)
- check reset behavior.
What is FIFO Verilog?
This paper deals with the design of Synchronous FIFO using Verilog. A FIFO (First-In-First-Out) is a memory queue, which controls the data flow between two modules. It has control logic embedded with it, which efficiently manages read and write operations.
Where is asynchronous FIFO used?
Asynchronous FIFOs are used to safely pass data from one clock domain to another clock domain. There are many ways to do asynchronous FIFO design, including many wrong ways. Most incorrectly implemented FIFO designs still function properly 90\% of the time.
What is VLSI FIFO?
A FIFO is a special type of buffer. The name FIFO stands for first in first out and means that the data written into the buffer first comes out of it first. There are other kinds of buffers like the LIFO (last in first out), often called a stack memory, and the shared memory.
Is FIFO a memory?
FIFO memory are integrated circuits (ICs) that buffers and stores data. This means that the data that is stored first is removed first. FIFO depth is the term given to the amount of memory that can be stored. FIFO memory is used for buffering applications or when data needs to be stored temporarily.
How does a dual port RAM work?
Dual-ported RAM (DPRAM) is a type of random-access memory that allows multiple reads or writes to occur at the same time, or nearly the same time, unlike single-ported RAM which allows only one access at a time. Apart from VRAM, most other types of dual-ported RAM are based on static RAM technology. …
Where do we use asynchronous FIFO?
What is gray FIFO?
tryey gray code 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.
What is meant by synchronous FIFO?
Synchronous FIFO : Fifo (first-in-first-out) are used to for serial transfer of information whenever there is a difference of Transfer rate. The Transfer rate may differ due to difference in number of ports, frequency or data-width between source and destination.
Is grey-coding necessary for FIFO?
Grey coding of the address can be a good idea in asynchronous fifos as it minimises problems crossing the clock domains – but it can be done safely without grey coding. Thank you for the info. i am using the conditions of MSB’s to check whether it is empty or full for synchronous fifo.
What is FIFO (first-in-first-out)?
Fifo (first-in-first-out) are used to for serial transfer of information whenever there is a difference of Transfer rate. The Transfer rate may differ due to difference in number of ports, frequency or data-width between source and destination. The FIFO width is chosen to compensate for the Transfer rate and is calculated as follows:
How to calculate the FIFO size?
The FIFO width is chosen to compensate for the Transfer rate and is calculated as follows: Fifo size = Source Freq. * ports * Data-with / Dest. Freq. * ports * Data-with If the FIFO size is a fractional number then we round-up the FIFO size to nearest largest whole number. For Ex 4.33 -> 5.