Multimedia Processors: Display Pipelines, Memory and Timing Budgets
Yenra | Updated September 17, 2026
Article: https://yenra.com/microprocessors/multimedia.html

Purpose: Estimate and measure a display workload. These generic calculations establish budgets; verify supported modes in the exact device and panel manuals.
Processor, board, software and manual revisions:
Panel active width x height (pixels):
Refresh (Hz) / pixel format / bytes per pixel:
Actual stride (bytes per row):
Framebuffer bytes = stride x height:
Buffer count and other allocations:
Scanout MB/s = framebuffer bytes x refresh / 1,000,000:
Other reads/writes per displayed frame:
Total ideal traffic and excluded overhead:

Worked example: 800 x 480 x 4 = 1,536,000 bytes = 1.536 decimal MB. Two buffers = 3.072 MB. At 60 Hz, scanout = 92.16 MB/s. One source read + one destination write + scanout = 276.48 MB/s. Assumes tightly packed rows and full-frame transfers. Frame interval = 16.67 ms. These are not SH7785 specifications.
Measured typical / worst frame time (ms) and workload:
Concurrent bus users:
Underrun / tearing / dropped update observations:
Buffer-swap policy and behavior when late:
Changed variable, result and acceptance decision:


SOURCE REFERENCES
Renesas’s SH7785 page
https://www.renesas.com/en/products/sh7785
Renesas SH7785 hardware manual
https://www.renesas.com/en/document/mah/sh7785-hardware-manual