IT6605
(SACD) to provide superiore audio hearing experiences. Based on the register setting of the system
controller, the IT6605 outputs DSD audio optionally through existing I2S output pins. A total of 8 data
outputs are provided for right channels and left channels. Refer to Pin Description on page 5 for
detailed port-to-pin mapping.
High-Bit-Rate Audio (HBR)
High-Bit-Rate Audio is also new to the HDMI standard. It is called upon by high-end audio system
such as DTS-HD and Dolby TrueHD. No specific interface is defined by the HBR standard. The
IT6605 supports HBR audio in two ways. One is to employ the four I2S outputs simultaneously, where
the original streaming DSD audio is broken into four parallel data streams. The other is to use the
S/PDIF output port. The data rate in the later case is as high as 98.304Mbps. A coherent MCLK is
generated by the IT6605 for the backend audio processors.
Smart Audio Error Detection
Some previous HDMI Sink products were reported to generate unbearably harsh sounds during
hot-plug/unplug as well as unspecified audio error. Like its predecessor CAT6011, the IT6605 prides
itself for detecting all kinds of audio error and soft-mutes the audio accordingly, therefore preventing
unpleasant noise from outputting.
Interrupt Generation
To provide automatic format setting, hot plug/unplug handling and error handling, the system
micro-controller should monitor the interrupt signal output at Pin 102 (INT#). The IT6605 generates an
interrupt signal whenever events involving the following signals or situations occur:
1. A status change of incoming 5V power signals at pin 30 or pin 35 (corresponding to plug/unplug)
2. Stable video is acquired (SCDT at pin 101 is asserted)
3. Events of audio errors and/or audio mute
4. Events of ECC errors
5. Video mode change
Without software intervention the hardware of the IT6605 should be able to output some sort of
displayable video data. However, this video could be in the wrong format or color space. Also,
hardware alone is not sufficient in handling the exception events listed above. The micro-controller
must monitor the INT# signal carefully and poll the corresponding registers for optimum operation.
Configuration and Function Control
The IT6605 comes with three serial programming ports: one for interfacing with micro-controller, the
other two allowing access by HDMI Sources through the two DDC channels of the HDMI links.
Feb-2012 Rev:0.92 13/38
www.ite.com.tw
ITE [ ITE TECH.INC. ]
