RE: nrf54: (Ab)using SPIM as a shift-register - between-TXLIST latency

Håkon Alseth — Mon, 04 May 2026 14:10:57 GMT

Hi,

Do you have any measurements to share, so I can see the delay? I would expect 1 us typically, based on the description in the datasheet.

The time from .START -> actual transmission start is typically 1 us:

And when .PSEL.CSN is configured, the timing will behave as described in the datasheet:

Ie. you will get a delay before- and after a transmission, thus you will see a "double delay" between each transaction (one byte in your scenario).

[quote user=""]I set IFTIMING.CSNDUR to 0.[/quote]

If we look at the definition of this register:

it mentions specifically:

Note that for low values of CSNDUR, the system turnaround time will dominate the actual time between transactions

Kind regards,

Håkon