Messages in this thread | | | Date | Fri, 12 Mar 2021 11:20:15 +0100 | From | Michael Walle <> | Subject | Re: [RFC PATCH 0/6] spi: Add OSPI PHY calibration support for spi-cadence-quadspi |
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Am 2021-03-12 11:10, schrieb Pratyush Yadav: > 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.
-michael
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