There are physical status pins that are recommended to be
accessible on the board for debug. The two most important signals are the
INIT_B and DONE signals. The pulsing of
INIT_B from Low to High indicates the completion of initialization at
power-up, and then a falling INIT_B signal later in the process can indicate
a CRC error. Having access to the INIT_B and DONE signals is
critical for FPGA configuration debug.
In addition to the status signals, there are key configuration pins that provide helpful information and should be handled carefully to prevent problems during configuration. These pins are listed below:
- Mode pins
M[2:0] -
PROGRAM_Bpin -
CFGBVSpin -
PUDC_Bpin