Silicon Image
Confidential for Philips
Consumer Electronics
Internal Use Only
SiI9185A 3:1 HDMI 1.3 Switch
Preliminary Data Sheet
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SiI-DS-1016-0.80
© 2007 Silicon Image, Inc. CONFIDENTIAL 1
General Description
The SiI9185A is the first generation of TMDS switch device supporting Revision 1.3 of the HDMI Specification (HDMI
Consortium; June 2006). With three HDMI inputs and a single output, the SiI9185A provides a low-cost method of
adding additional HDMI ports to the latest Digital TVs. New DTVs can easily connect to the many HDMI sources
coming on the market, including DVDs, STB, game consoles, PCs, camcorders, and digital still cameras. The SiI9185A
is a fully HDMI compliant device providing a simple, low-cost method of retransmitting protected digital audio and
video, giving end-users a truly all-digital experience. Built-in backward compatibility with DVI 1.0 allows HDMI
systems to connect to any DVI 1.0 source.
The SiI9185A provides additional integrated features to help lower system cost and provide enhanced features to the end
consumer. To lower system cost, the SiI9185A provides a complete solution for switching sink-side HDMI signals. This
includes DDC switching, individual HPD control, and 5V sense. The addition of these features eliminates additional
external components, helping to lower cost. For source-side applications, the SiI9185A DDC switching can be bypassed
with an external 4-channel I
2
C-bus switch (e.g., Texas Instruments PCA95445) to allow clock stretching.
The SiI9185A is the first generation of device from Silicon Image to integrate the Extended Display Identification Data
(EDID). The EDID is stored in on-board RAM that is downloaded from the system microcontroller during power up or
initialization. The EDID is reflected on each of the three HDMI ports through the DDC bus. Flexibility is built in to
allow mixing different EDID formats in an application. This allows elimination of up to three EDID ROMs while also
saving board space.
Finally, the SiI9185A provides a complete, simple solution to enabling Consumer Electronics Control (CEC) in a DTV.
CEC is a single-wire bus that transmits remote control commands throughout a home network. The SiI9185A integrates
both an HDMI-compliant I/O and Silicon Image’s CEC API. The CEC I/O meets all HDMI compliance tests and
eliminates the need for additional external components, again saving board space. The CEC API manages reception and
transmission of all CEC signals according to the CEC protocol and makes the information available to the system
microcontroller. This significantly lowers the system-level control by the system microcontroller, simplifying firmware
overhead.
A very low power standby mode is available, allowing DTVs to meet industry low-power requirements such as Energy
Star. During this mode both the CEC and EDID are still functional.
Silicon Image’s SiI9185A uses the latest generation of TMDS core technology. These TMDS cores are guaranteed to
pass all HDMI compliance tests.
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