Altera Nios II Embedded Evaluation Kit Cyclone III Edition User Manual page 53

Creating a new 5:6:5 Pixel-Format component
A–3
Nios II Embedded Evaluation Kit, Cyclone III Edition
5. Edit the data-format-adapter named lcd_64_to_32_bits_dfa.
Change its (Output Interface Parameters)/(Data Symbols Per Beat)
from 4 to 2.
This changes its width-adaptation from 64.32 to 64.16.
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Rename it to lcd_64_to_16_bits_dfa.
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6. Regenerate your system.
Your software application is now responsible for filling the frame-buffer
with aligned 16-bit 5:6:5 pixel data; and the firmware which controls the
DMA must be modified to understand the different memory-buffer size
implications of 16-bit (instead of 32-bit) pixels.
Development Board Version 1.0. Altera Corporation
July 2010