Feature List; Overview; References; Integration And Application Hints - Fujitsu MB86R02 Jade-D Hardware Manual

Graphics controller

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MB86R02 'Jade-D' Hardware Manual V1.64

The Run-Length Decompression Unit (RLD) allows the unpacking of run-length compressed data

without processor interaction purely in hardware. For data in flash memory, such as simple

graphic content e.g. pictograms, company images (logo) etc., run-length decoding brings a

substantial benefit for bandwidth saving on the used external bus system especially during a

setup phase. The precondition for relieving a processor is that the input data is conform with the

data format and organization required by the target location (e.g. video RAM, sprite pattern RAM),

so that no further reformatting is necessary.

The RLD unit consists of a decompression module, an AHB slave, used for configuration data and

compressed data input and an AHB master for decompressed data output. This allows the

decompressing of data delivered by arbitrary AHB modules in the system. Also the target location

may be an arbitrary AHB slave of the system.

23.3 Feature List

Support of a simple run length compressing format (TGA™ like format, see also Fujitsu's

MB87P2020A 'Jasmine' Hardware Manual)

1/2/4/8/16/24/32 bit per pixel formats supported

AHB master for data output

FIFO for data input and output, allows burst access of AHB

Truevision™ TGA™ FILE FORMAT SPECIFICATION, Truevision Inc.Version 2.0

The transfer of data from an arbitrary input interface like MEMC is controlled by the central

MB86R02 'JADE-D' AHB HDMA module, while the transfer of data from MediaLB to RLD is

controlled by MediaLB itself. The transfer of the decompressed output data from RLD to the

wished target location like the video memory in the external DRAM is controlled by the local RLD

DMA controller.

The standard AHB-Bus communication protocol is used.

The standard AHB-Bus communication protocol is used.

The RLD unit has a level interrupt output signal