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EPPI Functional Description
• RGB888 to RGB666 or RGB565 conversion for transmit modes
• 4:2:2 YCrCb data Tx/Rx interleaving or de-interleaving modes
• Configurable LCD data enable (DEN) output available on frame sync 3
• Delayed start of PPI frame syncs
• Data clipping and mirroring
• Horizontal and vertical windowing for general purpose 2 and 3 frame sync modes
• Preamble, blanking and stripping support
• Multiplexing dual input
EPPI Functional Description
The EPPI has the following functionality.
RGB data formats
For transmit modes, the EPPI can convert RGB888 data in memory to either RGB565 or RGB666 at the
output using bits in the Control register.
Data clipping
The EPPI contains two registers to define the lower and upper limits for the Luma and Chroma components.
This functionality is used for clipping data values during 8-bit, 10-bit, 12-bit or 16-bit transmit modes.
Data mirroring
A data mirroring feature is available which mirrors the EPPI data bits 15–0. This functionality is available in
both transmit and receive modes.
Windowing
The EPPI supports windowing for general-purpose input modes.
Preamble, blanking and stripping support
The EPPI can embed blanking information and clip active data to be transmitted. This functionality is availa-
ble for single channel data, interleaved data, and parallel data and supports data lengths equal to 16 bits, 20
bits or 24 bits.
18–2
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