client high-definition set-top boxes, compliant with ATSC, DVB, DIRECTV, DCII,
OpenCable and ARIB BS4 specifications. It includes all processing for DVD applications.
The STx7101 demultiplexes, decrypts and decodes HD or SD video streams with associated
multi-channel audio. Video is output to two independently formatted displays: a full resolution
display intended for a TV monitor, and a downsampled display intended for a VCR or DVD-R.
Connection to a TV or display panel can be analog through the DACs, or digital through a copy
protected DVI/HDMI. Composite outputs are provided for connection to the VCR with
Macrovision protection. Audio is output with optional PCM mixing to an S/PDIF interface,
PCM interface, or through integrated stereo audio DACs. Digitized analog programs can also
be input to the STx7101 for reformatting and display. The STx7101 includes a graphics
rendering and display capability with a 2D graphics accelerator, three graphics planes and a
cursor plane. A dual display compositor provides mixing of graphics and video with
independent composition for each of the TV and VCR/DVD-R outputs. The STx7101 includes
a stream merger to allow seven different transport streams from different sources to be merged
and processed concurrently. Applications include DVR time-shifted viewing of a terrestrial
program, while acquiring an EPG/data stream from a satellite or cable front end.
The flexible descrambling engine is compatible with required standards including DVB, DES,
AES and Multi2. The STx7101 embeds a 266 MHz ST40-202 CPU for applications and device
control. A dual DDR1 SDRAM memory interface is used for higher performance, to allow the
video decoder the required memory bandwidth for HD H.264 and sufficient bandwidth for the
CPU and the rest of the system. A second memory bus is also provided for flash memory,
storing resident software, and for connection of peripherals. This bus also has a high speed
synchronous mode that can be used to exchange data between two STx7101 devices. This can
be used to connect a second STx7101 as a co-decoder for a dual TV STB application. A hard-
disk drive (HDD) can be connected either to the serial ATA interface, or as an expansion drive
through the USB 2.0 port.
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