Can we configure SPIM3 (Instance 3) at SCK more than 8MHz?

RE: Can we configure SPIM3 (Instance 3) at SCK more than 8MHz?

Sigurd — Tue, 11 Sep 2018 19:33:05 GMT

Hi Glen M,

[quote userid="73356" url="~/f/nordic-q-a/20735/can-we-configure-spim3-instance-3-at-sck-more-than-8mhz/148287"]It looks like SPIM3 is at least somewhat functional in the nRF52840 Rev 1 Errata document. Can it be used at greater than 8MHz (with Rev 1 silicon)?[/quote]

Yes, you can run it at 16 Mbps and 32 Mbps with Rev 1.

RE: Can we configure SPIM3 (Instance 3) at SCK more than 8MHz?

Glen M — Tue, 11 Sep 2018 19:23:20 GMT

It looks like SPIM3 is at least somewhat functional in the nRF52840 Rev 1 Errata document. Can it be used at greater than 8MHz (with Rev 1 silicon)?

RE: Can we configure SPIM3 (Instance 3) at SCK more than 8MHz?

jayaram — Sun, 26 Mar 2017 05:16:53 GMT

So, whether it is nrF52832 or nrF52840 , both doesnt have SPI periphal of frequency more than 8MHz. But in datasheet the frequency register set allow upto 32MHz. Which is going to be added in errata (as per sigurd statement).

RE: Can we configure SPIM3 (Instance 3) at SCK more than 8MHz?

jayaram — Sun, 26 Mar 2017 05:14:53 GMT

ok. I will try with 8MHz currently.

RE: Can we configure SPIM3 (Instance 3) at SCK more than 8MHz?

Turbo J — Sat, 25 Mar 2017 21:37:01 GMT

Whoops, mixup with the nRF52832 - which does not even have SPIM3. Need to clean my glasses...

RE: Can we configure SPIM3 (Instance 3) at SCK more than 8MHz?

Sigurd — Thu, 23 Mar 2017 15:02:07 GMT

You can unfortunately not use the QSPI as a regular SPI master, it’s very targeted to be used for external flash devices. So an option is to develop your application for now using e.g. SPIM2, and then switch to SPIM3 when you have the production variant of the chip, and use 16/32 MHz. Switching from SPIM2 to SPIM3 should only be a matter for changing 2-3 lines of code when the production variant is ready.

RE: Can we configure SPIM3 (Instance 3) at SCK more than 8MHz?

jayaram — Thu, 23 Mar 2017 12:40:21 GMT

Can I use QSPI to interface with SPI slave device, instead of external flash. I am trying to interface with an SPI slave device which required ~20MHz clock to achieve better performance.

RE: Can we configure SPIM3 (Instance 3) at SCK more than 8MHz?

Sigurd — Thu, 23 Mar 2017 12:35:47 GMT

The nRF52832 don't have a SPIM3, it only have SPIM0 -> SPIM2, where the max is 8 MHz. What are you interfacing with nRF5x ? Note that the nRF52840 also have Quad SPI that you can use to interface with a external flash memory. The QSPI supports 32 MHz.

RE: Can we configure SPIM3 (Instance 3) at SCK more than 8MHz?

jayaram — Thu, 23 Mar 2017 12:32:11 GMT

Hi, Does the same issue exists with nrf52832 IC? Can we configure SPI clock for more than 8 MHz?

RE: Can we configure SPIM3 (Instance 3) at SCK more than 8MHz?

Sigurd — Thu, 23 Mar 2017 12:01:43 GMT

The production variant is expected in Q4 2017.

RE: Can we configure SPIM3 (Instance 3) at SCK more than 8MHz?

jayaram — Thu, 23 Mar 2017 11:39:31 GMT

ok. Thank you very much for the info. May I know what would be the approximate release date of the latest chip.?

RE: Can we configure SPIM3 (Instance 3) at SCK more than 8MHz?

Sigurd — Thu, 23 Mar 2017 11:28:26 GMT

Hi,

SPIM3 is unfortunately not functional on the Engineering A revision of nRF52840 (The chip that is on the nRF52840 Preview DK). This will be added to the errata list as soon a possible. When the production ready chip is released later this year, the SPIM3 will be a high speed SPIM (supporting up to 32 MHz).

RE: Can we configure SPIM3 (Instance 3) at SCK more than 8MHz?

Wojtek — Thu, 23 Mar 2017 09:40:08 GMT

@Turbo J Are You sure? I was sceptical about this question too, but specification says: "The actual maximum data rate depends on the slave's CLK to MISO and MOSI setup and hold timings."

Also, FREQUENCY register allows up to 32M. Also, for modules SPIM0-2, it is stated that: "Not supported: > 8 Mbps data rate", but for SPIM3 it is not stated. So, I would wait for some confirmation from Nordic guys. Ofc we are talking about nRF52840.

RE: Can we configure SPIM3 (Instance 3) at SCK more than 8MHz?

Turbo J — Thu, 23 Mar 2017 09:23:39 GMT

Nope, more than 8 MHz is not possible.