AM620-Q1: Output MCASP2_AFSX to multiple pins simultaneously

Til Schoengarth

Intellectual 1210 points

Part Number: AM620-Q1

Hello team,

would it be possible to output the MCASP2_AFSX bit clock to multiple pins simultaneously?

MCASP2_AFSX -> AC20, B15, T24

Best regards,

Til

8 months ago

0 Karam Haddad 8 months ago

TI__Intellectual 1490 points

Hello Til,

It seems like you meant to reference MCASP2_ACLKX (pins AC20, B15, T24), instead of AFSX.

Also, outputting the same McASP signal on multiple pins isn't a supported mode of operation. TI recommends using only the timing closed IOSET pin combinations.

Could you share the reason why you need the clock on 3 pins so I can suggest a better approach?

Regards,
Karam

0 Til Schoengarth 8 months ago in reply to Karam Haddad

TI__Intellectual 1210 points

Thanks!

This would be done to provide two peripherals with the Bit Clock and to avoid reflections in the traces.

0 Karam Haddad 8 months ago in reply to Til Schoengarth

TI__Intellectual 1490 points

Hello Til,

It's true that using a fly-by topology would not be recommended here due to signal integrity concerns.

If timing constraints allow, I recommend using a 1-to-2 buffer. You could also look into a Balanced-T topology where the traces are equal length and are really short.

For a 1-to-2 buffer solution, please check out the LMK1C1102.

Regards,
Karam

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AM620-Q1: Output MCASP2_AFSX to multiple pins simultaneously