Honored ContributorHi,
I want to add a SD card reader to the hardware of a cyclone3. I have the JTAG/ISP SPI interface wired out. If the system is booted from flash, can I bolt a SD card reader to the programmer interface somehow? (for FAT) Or do I need more pins?
Honored ContributorIf you mean the jtag pins (tck, tms, ...) the answer is No. Those are dedicated pins and you can't use them. You need to wire out any other general purpose I/Os.
Honored ContributorHonored ContributorFlashNCE and data pins are dual purpose pins and they can indeed be used as GP I/O pins.
You have to set them as generic I/O in the device configuration assignmentsHonored ContributorHonored ContributorIf you set these dual-purpose pins as "Use as regular I/O" in the Quartus project settings, you can use them like any other I/O pin.
The configuration file instructs the fpga to initialize them in the orrect way. After this, is up to your design to control them for your specific purpose.
