12-07-2017 10:03 PM
we use MT25QU512ABB1EW9-0SIT with zcu2eg, QSPI is sample at rise edage of clk ,but we capture the scope with Agilent MSO9254A，it is looks like sample at falling edage of clk ;
Test point:nearby pin of qspi
Porbe of CH2:Agilent N2796A
Probe of CH3:Agilent N2873A
12-08-2017 04:20 PM
You should double check the setting for CPOL / CPHA in the QSPI control register.
That QSPI part samples on the rising edges and outputs on the trailing edges (CPOL0 / CPHA0)
It looks like the control register is set for CPOL1 / CPHA1 when it should be set for CPOL0 / CPHA0.
There is a very good explanation about CPOL / CPHA in Wikipedia
Be aware the QSPi controller only supports these two combinations: CPOL0 / CPHA0 or CPOL1 / CPHA1
12-10-2017 10:16 PM - edited 12-10-2017 10:17 PM