SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
DISPC provides three sets of configuration registers to control the maximum frame size in different stages of its internal pipelines (see Figure 13-96, DISPC Frame Width Control):
The MEMSIZEX and SIZEX bit-fields are 11-bit, meaning the maximum horizontal frame size allowed is 2048 pixels. This parameter determines the maximum source frame (including the input to the scalers) that can be displayed.
The MEMSIZEY and SIZEY bit-fields are 12-bit, meaning the maximum vertical size allowed is 4096 lines.
The LPP and PPL bit-fields are also 12-bit, which means that starting at the LCD/TV overlay manager and including the output to the display panel, the frame size can be up to 4096x4096 as long as the pixel clock constraints are met.
Implication: The output to display panel can be as large as 4096 x 4096 (4K x 4K), although the actual size of the output frame would be smaller due to the maximum pixel clock limitation. However, the maximum source frame that can be read from memory by a single GFX/VID pipeline can be 2048 x 4096 (2K x 4K) only. Therefore, to display a source frame with width > 2048 pixels, two layers must be used and corresponding pipeline outputs must be merged in the overlay manager before being sent out to the display panel.
Refer to device Data Manual for details on the maximum supported pixel clock (VOUTx_CLK) or HDMI supported frame rates.