Zoom Example System - 1.0 English

AXI4-Stream Video IP and System Design Guide (UG934)

Document ID

UG934

Release Date

2022-11-16

Version

1.0 English

This Figure shows a video system that includes live-external video (peak) bandwidth and memory (average) bandwidth requirements.

Figure 2-25: Zoom (640x480p@60 to 720p@60) Subsystem Example
X-Ref Target - Figure 2-25

In the This Figure , 1280x720p live video frames are written to external memory with a bandwidth of 1.19 Gb/s. A 640x480 region in the video frame is read at an average bandwidth of 0.29 Gb/s. These frames are then up-scaled and written at an average bandwidth of 0.88 Gb/s. The upscaled frames can then be read from external memory at a peak bandwidth of 1.19 Gb/s to display to external video (Same as the input).

Thus, video input bandwidth is BW _peak of input size. Video output bandwidth is BW _peak of output size. Intermediate memory read bandwidth is B _Wave of input size. Intermediate memory write bandwidth is B _Wave of output size.

Table 2-9: Zoom Subsystem Example Total Bandwidth and Minimum Frequency Requirements
	Video Input (Memory Write)	Memory Read	Memory Write	Memory Read (Video Output)	Total/Maximum
Minimum Frequency	74.25 MHz	18.43 MHz	55.3 MHz	74.25 MHz	74.25 MHz Max
Minimum Bandwidth	1.19 Gb/s	0.29 Gb/s	0.88 Gb/s	1.19 Gb/s	3.55 Gb/s (Sum) 2.07 Gb/s (W) 1.48 Gb/s (R)