BTW. it is possible to overclock the normal PSRAM to 166MHz without many errors that is nearly 2 times the normal speed.
176MHz will not work. The PSRAM IC used was APS6404L-3SQR-SN
FLEXSPI2_CLK_SEL = 10
LPSPI_PODF = 11
CCM_CBCMR=75AE8204 (166.2 MHz)
EXTMEM...
