How does FIFO work in Verilog?
FIFO is an approach for handling program work requests from queues or stacks so that the oldest request is handled first. In hardware, it is either an array of flops or read/write memory that stores data from one clock domain and on request supplies the same data to other clock domains following FIFO logic.
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.
What is a buffer in Verilog?
This module (in both Verilog and VHDL) is a First-in-First-Out (FIFO) Buffer Module commonly used to buffer variable-rate data transfers or to hold/buffer data used in digital communication and signal processing algorithms. For example, a FIFO module can be used as a circular buffer or delay line in a FIR filter.
How do you write FIFO code in Verilog?
Verilog Code for the FIFO Buffer (FIFObuffer.v)
- module FIFObuffer( Clk,
- dataIn,
- RD,
- WR,
- EN,
- dataOut,
- Rst,
- EMPTY,
What happens when FIFO is full?
The FULL line only changes its level synchronously with WRITE CLOCK, even if the change is produced by the reading of a data word. Likewise, the EMPTY signal is synchronized with READ CLOCK. A synchronous FIFO is the only concurrent read/write FIFO in which the status signals are synchronized with the driving logic.
How do you determine FIFO depth?
Example : FIFO Depth Calculation FIFO DEPTH = B – B *F2/(F1*10) .
Why TLM FIFO is used?
A FIFO element is required in between to store packets so that it allows both the sender and the receiver to independently operate. A TLM FIFO is placed in between testbench components that transfer data objects at different rates.
What is 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.
How do you calculate synchronous FIFO depth?
Example : FIFO Depth Calculation If if we have alternate read cycles i.e between two read cycle there is IDLE cycle. If 10 IDLE cycles betweeen two read cycles . FIFO DEPTH = B – B *F2/(F1*10) .
How does FIFO buffer work?
A FIFO buffer stores data on a first-in, first-out basis. The storage structure is typically an array of contiguous memory. 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.
What is a FIFO in Verilog?
FIFO is an acronym for First In First Out, which describes how data is managed relative to time or priority. In hardware FIFO buffer is used for synchronization purposes. It is often implemented as a circular queue, and has two pointers: Read Pointer/Read Address Register. Write Pointer/Write Address Register.
What are the status signals for FIFO in Verilog?
The First-In-First-Out (FIFO) memory with the following specification is implemented in Verilog: Status signals: Full: high when FIFO is full else low. Empty: high when FIFO is empty else low. Overflow: high when FIFO is full and still writing data into FIFO, else low. Underflow: high when FIFO is empty and still reading data from FIFO, else low.
What kind of Gray code is used for FIFO?
The Gray code counter used in this design is “Style #2” as described in Cliff Cumming’s paper. The FIFO counter consists of an n-bit binary counter, of which bits [n-2:0] are used to address the FIFO memory, and an n-bit Gray code register for storing the Gray count value to synchronize to the opposite clock domain.
When to use overflow or empty in FIFO?
Full: high when FIFO is full else low. Empty: high when FIFO is empty else low. Overflow: high when FIFO is full and still writing data into FIFO, else low. Underflow: high when FIFO is empty and still reading data from FIFO, else low. Threshold: high when the number of data in FIFO is less than a specific threshold, else low.
How is FIFO storage modeled using SystemVerilog interfaces?
The FIFO storage is modeled using SystemVerilog mailboxes built-in mailbox methods will be used for writing and reading the FIFO 1-22 Mailboxes XA mailbox is a communication mechanism where data can be sent to a mailbox by one process and retrieved by another XSystemVerilog mailboxes behave like real mailboxes X X X X X