Video Stream FIFO

Control backpressure between hardware logic and upstream video interface

  • Library:
  • SoC Blockset / Hardware Logic Connectivity

Description

The Video Stream FIFO block controls the back-pressure from the hardware logic to the upstream video interface. It also controls the flow between the upstream and downstream pixel data interfaces of hardware logic. Integrate this block as a configurable first-in, first-out (FIFO) block for AXI4 video stream applications. The block enables you to configure its depth and set its almost full threshold value.

Ports

Input

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Input pixel data from the data source. Specify this value as a scalar.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | fixed point

Control signals accompanying the pixel stream, specified as a pixelcontrol bus containing five signals. The signals describe the validity of the pixel and its location in the frame.

Data Types: pixelcontrol

Control signal that indicates if the block can send pixel data to the downstream interface. When this value is 1 (true), the downstream interface is ready, and the block can send the pixel data. When this value is 0 (false), the downstream interface is not ready, and the block cannot send the pixel data.

Data Types: Boolean

Output

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Output pixel data to the downstream interface. The data type of this output data is the same as the data type of the input data.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | fixed point

Control signals accompanying output pixel stream, returned as a pixelcontrol bus containing five signals. The signals describe the validity of the pixel and its location in the frame.

Data Types: pixelcontrol

Control signal that indicates if the block is ready to receive pixel data from the upstream interface. When this value is 1 (true), the block is ready to accept pixel data from the upstream interface. When this value is 0 (false), the block is not ready to accept pixel data from the upstream interface.

Data Types: Boolean

Parameters

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Specify the depth of the FIFO. This value must be a positive scalar integer and is the maximum number of entries that can be buffered before data gets dropped.

Specify a value that asserts a back-pressure signal from the block to the data source.

To avoid dropping data, set a value allowing the data source enough time to react to backpressure. This value must be a positive integer and smaller than the FIFO depth.

Extended Capabilities

Fixed-Point Conversion
Design and simulate fixed-point systems using Fixed-Point Designer™.

See Also

Introduced in R2019a