MB87P2020 Datasheet, PDF (151/356 Pages) Fujitsu Component Limited. – Colour LCD/CRT/TV Controller

Graphic Processing Unit
1 Functional Description
1.1 GPU Features
The GPU (Graphics Processing Unit) is a part of Fujitsu’s display controllers MB87J2120 (’Lavender’) and
MB87P2020-A (’Jasmine’). In the following these two controllers are referred to as GDC (graphics display
controller).
The GPU is responsible for producing visible images from pixel data stored in VideoRAM (SDRAM). Its
features include:
• maximum flexibility by configuration registers for most functions
• wide range of supported display types and sizes (see chapter 7)
• twin display mode (digital and analog displays in parallel) (Jasmine only)
• up to four layers from a whole of 16 displayed simultaneously and overlapping in four planes
• size, color resolution and position on the display configurable on a per-layer basis
• blinking and transparency individual for each layer
• separate setting for display background color
• YUV to RGB matrix with configurable coefficients as well as a loadable gamma table included (Jas-
mine only)
• synchronization with the video interface controller (VIC) allowing frame rate conversion
• flexible generation of almost arbitrary sync signals
• individual settings for clamping values at digital and analog outputs (Lavender can only handle one
clamping color)
• color key output
• internal and external pixel clock
• masking and division by 2 for internal pixel clock
• programmable interrupts
— at specified display location
— for insufficient memory bandwidth
• diagnostic read back
— current display location
— current blink state of layers
— current input FIFO load
The image on display is produced in a three-step approach: fetching pixel data, transforming and merging
the layers from their respective color space to one common, and finally formatting the bit stream appropriate
for the actual display used.
Functional Description
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