AD9380 - Recommended Settings

I would still appreciate anyone's input on this.

Hi Mrts,

     To answer your questions:

     1.) 480p is really going to be any of the 480i, 480p, 576i or 576p modes. All of those are going to be in the 27MHz clock range. I know that 480i is 13.5MHz, but the HDMI (TMDS) link must transmit that as a pixel repeated version that is actually 1440x240 in order to bring the effective TMDS clock rate to greater than 20MHz - the lowest supported TMDS clock rate. So plan on using the recommendations for low frequency for all of those settings. 720p, 1080i and 1080p would be covered by the 'All Modes/ Optimized 1080p' settings.

     You have posed a good question re: the setting of R0x34[5]. It doesn't need to be set, as you are setting the 'auto' mode in bit 4. There is no need to set that.

     As to the reset of the audio PLL by writing 0x00 to R0x7F - yes, this is technically a read-only register, however, by 'writing' to it you are able to alert it to re-acquire the N and CTS values for the audio. What is meant by a mode change is from one video mode to another (for instance: 480p to 720p), or a loss of TMDS clock. Eithe of those would represent an opportunity for he audio definition to change. When in a video mode that doesn't change, there is little likelihood that the number of channels or the sampling rate of the audio will change, so it is not necessary to re-acquire the base settings.

Best,

Chris

Very much appreciate the feedback. I will implement your feedback. Thanks.