Am 2021-03-12 12:07, schrieb Pratyush Yadav:

On 12/03/21 11:20AM, Michael Walle wrote:

quoted

Am 2021-03-12 11:10, schrieb Pratyush Yadav:

quoted

There is usually a delay from when the flash drives the data line (IOW,
puts a data bit on it) and when the signal reaches the controller. This
delay can vary by the flash, board, silicon characteristics,
temperature, etc.

Temperature might change over time, but the calibration is only done
once. I don't know how much influence the temperature actually has, 
but
our boards are usually operating from -40°C to +85°C. So there might 
be
a possible temperature difference of 125K between actual calibration 
and
when the flash is accessed.

The algorithm supports a temperature range of -45 C to +130 C. The
temperature is checked at calibration time and adjustments are made to
make sure the reads work over the entire temperature range [0].

Ah, nice. And you need the current temperature to correlate it to the
meassured timings, right?

-michael