IT66121FN View Datasheet(PDF) - ITE Tech. INC.

Part Name

Description

Manufacturer

IT66121FN

Low Power Transmitter with HDMI1.4 3D

ITE Tech. INC. 

IT66121FN

High-Bit-Rate (HBR) Audio is first introduced in the HDMI 1.3 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 IT66121 supports HBR audio in two ways. One is to employ the four I2S inputs

simultaneously, where the original streaming HBR audio is broken into four parallel data streams

before entering the IT66121. The other is to use the S/PDIF input port. Since the data rate here is as

high as 98.304Mbps, a coherent MCLK is required in this application.

Interrupt Generation

The system micro-controller should take in the interrupt signal output by IT66121 at PIN 10 (INT). INT

pin can be configured as Push-pull or Tristate mode depending on user’s application. IT66121

generates an interrupt signal with events involving the following signals or situations:

1. Hot-plug detection (Pin 14, HPD) experiences state changes.

2. Receiver detection circuit reports the presence or absence of an active termination at the TMDS

Clock Channel (RxSENDetect)

3. DDC bus is hanged for any reasons

4. Audio FIFO overflows

5. HDCP authentication fails

6. Audio/Video data is stable or not

A typical initialization of HDMI link should be based on interrupt signal and appropriate register probing.

Recommended flow is detailed in IT66121 Programming Guide. Simply put, the microcontroller should

monitor the HPD status first. Upon valid HPD event, move on to check RxSENDetect register to see if

the receiver chip is ready for further handshaking. When RxSENDetect is asserted, start reading EDID

data through DDC channels and carry on the rest of the handshaking subsequently.

If the micro-controller makes no use of the interrupt signal as well as the above-mentioned status

registers, the link establishment might fail. Please do follow the suggested initialization flow

recommended in IT66121 Programming Guide.

www.ite.com.tw

Nov-2011 Rev:0.99 11/39

Share Link: