AM3358: Operating at 25MHz

Stephen Potter

Part Number: AM3358
Other Parts Discussed in Thread: AMIC110

The AM3358 is specified for operation at 19.2, 24, 25 & 26MHz but within the TRM generally uses operation at 24MHz as the basis of discussion

There are a couple of interfaces which are identified as being affected if the clock frequency is not 24MHz, namely the ADC and McASP interfaces.

We donot use either of these interfaces but I have been requested to confirm that there are no other restrictions.

Using AM3358BGCZA80EP @ 25MHz on custom Hardware

Any help gratefully received

over 8 years ago

0 Rahul Prabhu over 8 years ago

TI__Guru** 116780 points

Stephen,

We use 24 MHz clock frequency reference in the TRM as this is the most commonly used crystal on TI Evaluation platforms but the device has been tested at all the crystal values specified.

ARM Linux/Uboot has the clock configuration to setup MPU PLL and the SYS PLL using all these different clock settings. Additionally we have recently created a AMIC110 ICE evaluation platform that has the 25Mhz clock as the input clock as you can see from here:
www.ti.com/.../getliterature.tsp

MCASP and ADC achievable sampling rates are dependent on the input crystal when SOC is the clock master so there is a dependency when in master mode. For additional confirmation, you can simulate your device clocks using clock tree tool here to ensure all interfaces that you have on the design can achieve the desired clock settings.
processors.wiki.ti.com/.../AM335x_Clock_Tree_Tool

Hope this helps.

Regards,
Rahul

0 Stephen Potter over 8 years ago in reply to Rahul Prabhu

Prodigy 70 points

Rahul,

Thank you that's exactly what I needed

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AM3358: Operating at 25MHz