CAT6613 Ver la hoja de datos (PDF) - Unspecified

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CAT6613

HDMI 1.3 Transmitter

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CAT6613 Datasheet

Interrupt Generation

The system micro-controller should monitor the interrupt output by the CAT6613 at PIN 24 (INT). The

CAT6613 generates an interrupt signal with events involving the following signals or situations:

1. A status change at Pin 51 (HPD), implicating hot-plug/unplug events

2. Receiver detection circuit in the CAT6613 reports the presence or absence of an active termination

at the TMDS Clock Channel (Register 0Eh[5], RxSENDetect)

3. DDC bus is hanged for whatever reasons

4. Audio FIFO overflows

5. HDCP authentication fails

6. Video data is stable or not

In an HDMI link the transmitter is responsible for initialize the link, which should be based on interrupt

signal and appropriate register probing. Recommended flow is detailed in CAT6613 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 CAT6613 Programming Guide.

The CAT logo is a registered trademark of Chip Advanced Technology

2008 Chip Advanced Technology Inc. – All Right Reserved.

Mar-2010 Rev:1.0 12/37

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