AM6412: MCU_OSC0 clock input

Darshan Shah

Prodigy 180 points

Part Number: AM6412

Can we just provide oscillator clock instead of XTAL (don't connect XTAL) for MCU_OSC0?

So just connect 25Mhz oscillator clock output to MCU_OSC0_XI and connect MCU_OSC0_XO to GND?

over 3 years ago

0 peaves over 3 years ago

TI__Guru 63595 points

Are you planning to use the SERDES for USB SS or PCIe?

Regards,
Paul

0 Darshan Shah over 3 years ago in reply to peaves

Prodigy 180 points

No USB superspeed or PCIe interfaces we are going to use.

0 peaves over 3 years ago in reply to Darshan Shah

TI__Guru 63595 points

You can use a 1.8V LVCMOS clock source as shown in the MCU_OSC0 LVCMOS Digital Clock Source section of the AM64x datasheet.

Your external clock source should meet the following requirements.

Duty Cycle - 45%/55%
Maximum Rise/Fall Time - 8ns @ 10%/90%
RMS Period Jitter - 10ps, 100k samples
Peak to Peak Period Jitter - 100 ps, 100k samples
RMS Phase Jitter (random) - 2ps (when SERDES not used)

Regards,
Paul

+1 Darshan Shah over 3 years ago in reply to peaves

Prodigy 180 points

Ok great! Good to know that 1.8V LVCMOS oscillator with above spec. is fine. We can resolve the issue.

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AM6412: MCU_OSC0 clock input