STi3520

The video decoder is a real-time video decompression processorsupportingtheMPEG-1 andMPEG- 2 standards at video rates up to 720 x 480 x 60Hz or 720 x 576 x 50Hz. Picture format conversion for display is performed by a vertical and a horizontal filter (sample rate converter). External DRAM, typically of size 16 Mbits is required.

The audio decoder is compliant with layers I and II of the MPEG standard. Sampling rates of 32, 44.1 and 48kHz can be used.

The STi3520 requires minimal support from an external microcontroller, which is mainly required to initialise the video decoder at the start of every picture.Separate audio and video data streamsare input through the 8-bit data port. Time stamps are detected and made available to the microcontroller for themanagementof audio/videosynchronization.

User-definedbitmaps maybe superimposedonthe displayed picture through use of the on-screen display function. These bitmaps are written directly into the DRAM memory by the microcontroller.

Undetected bitstream errors which would cause decoder errors activate the error concealment functions.