Hi,I have a Cyclone V SE with a design that includes an SDIO Host Controller IP in order to attach an SDIO WiFi-Module to the System. The SDIO Host Controller IP needs fast input registers. When I try to route the SDIO signals over HPS Loan I/O Pins, Quartus Fitter ignores the 'fast input register' settings for SDIO CMD, SDIO_DAT[3..0]. Is there any way I can use fast input registers with HPS Loan I/O Pins? Best regards, Tobias
In Cyclone/Arria V the loan I/O have fewer features. The I/O registers are not present which is why loan I/O are not recommended for high speed interfaces. The HPS peripherals are registered but they do not rely on the register stage in the I/O and implement their own instead. These I/O also lack DDR capabilities so you can't route other things like a TSE out to them.