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BT817/8 Advanced Embedded Video Engine Datasheet

Version 1.1

Document No.: BRT_000302 Clearance No.: BRT#154

Figure 4-6 RGB Timing Waveforms

BT817/8 supports adaptive HSYNC and adaptive framerate operations. In adaptive HSYNC mode

the graphics engine may delay the start of the scanout line up to the cycle count given in

REG_AH_HCYCLE_MAX, while keeping PCLK running. Adaptive HSYNC is enabled when

REG_AH_HCYCLE_MAX is set to a non-zero value between REG_HCYCLE and 4095. In adaptive

framerate mode the graphics engine may suspend PLCK if the next scanout line is not ready.

BT817/8 supports Horizontal Scanout Filter (HSF) operation. The HSF applies a high-quality filter to

output pixels, correcting for LCD panels with non-square pixels (the physical size of the LCD pixel is

not square). HSF is enabled and disabled with CMD_HSF. Note that HSF and 2X are not supported

together.

Table 4-15 lists all the supported display modes for the RGB interface.

EXTSYNC

adaptive

HSF

Description

passthrough mode

framerate

passthrough, adaptive framerate

hsync

passthrough, adaptive hsync

Yes

not supported

Yes

extsync mode

Yes

extsync, HSF

Yes

framerate

extsync, adaptive framerate

Yes

framerate

Yes

extsync, adaptive framerate,

HSF

Yes

hsync

extsync, adaptive hsync

Yes

hsync

Yes

extsync, adaptive hsync, HSF

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