LMH0030 / LMH0031 timing interface

Felix Villar1

Other Parts Discussed in Thread: LMH0030, LMH0031Hello, I would like to use the LMH0030 and the LMH0031 to deserialize and serialize SD/HD video. I do not have very clear, because of the timing in the protocol, if I could use a microcontroller (several us each instruction) or it is mandatory to use a FPGA. If using a microcontroller and trying to read a data, apparently data will appear some nanoseconds after I toggle the ACLK and my bus will be already as an output. From the datasheet: After either a manual or power-on reset, ACLK must be toggled three (3) times to complete initiallization of the Ancillary and Control Data Port. Does it mean 1-0-1-0-1-0 or 1-0-1? Thanks, Félix.

over 11 years ago

0 Gary Melchior over 11 years ago

TI__Expert 4400 points

It is perfectly acceptable to use a microcontroller with the LMH0030 and LMH0031 (an FPGA is not required).

For toggling ACLK, one toggle of the clock means one complete sequence of a high transition followed by a low transition. So three toggles of ACLK is: 1-0, 1-0, 1-0.

ACLK controls the data flow through the ancillary and data control port, and there is no low frequency limit for ACLK when it is being used for control register access.

Gary Melchior

0 Felix Villar1 over 11 years ago in reply to Gary Melchior

Prodigy 90 points

Thanks so much!

Félix.

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LMH0030 / LMH0031 timing interface