The Lattice Semiconductor (formerlySilicon Image) SiI9573 and SiI9575
Port Processor is the latest generation HDMI® port processor targeted at audio video receivers, Home Theater in a Box (HTiB), and Digital TVs (DTVs). The port processor has many innovative features such as InstaPort® technology, InstaPrevue technology, Mobile High-definition Link (MHL®), ViaPort Matrix Switch (the SiI9575 device only), and Audio Return Channel (ARC). The two devices are the same except where noted; SiI9575 is used throughout this document to refer to both devices.
The SiI9575 port processor offers an extensive set of audio features including audio extraction and insertion. Audio from the active HDMI input is sent to the main or subaudio output port. High-Bitrate (HBR) audio is supported on the main audio output port. Additionally, a 2-channel I2S or an S/PDIF input receives PCM or bit stream audio from an audio DSP or a DTV SoC, and output to either the main or sub-HDMI output, or both.
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