AM335X: SPI Slave mode at 48MHz

WTMEC_Will Hsu

Hi TI team,

I'm trying to use the AM335x with SPI0 as slave only.
AM335x(SPI slave) can be accessed by a CPU(SPI master, clock=48MHz).

it is working fine at 48MHz.

But I see McSPI Input Timings(Slave Mode) in AM335x datasheet, the minimal cycle time is 62.5ns(~16MHz).

Does SPI slave support 48MHz?

Thanks.

From Will Hsu

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

This is correct, AM335X McSPI is rated up to 16MHz in Slave mode.

0 WTMEC_Will Hsu over 8 years ago in reply to Biser Gatchev-XID

Expert 2620 points

Hi Biser,
I have tested am335x SPI slave with 48MHz.
if reading and writing are working fine, Can I set SPI slave to 48MHz?
Are there any concerns for 48MHz?

0 PaulM over 8 years ago in reply to WTMEC_Will Hsu

TI__Mastermind 23075 points

The datasheet details the timings which have been characterized for the device. The values listed for that the peripheral will work as specified over variations in process, voltage, and temperature.

Just to clarify, the limitation in the case is for the SPI bit clock and not the clock provided to the module.

Paul

0 gang li56 over 6 years ago in reply to Biser Gatchev-XID

Prodigy 10 points

How do you configure it as slave mode?

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AM335X: SPI Slave mode at 48MHz