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Altera_Forum
Honored Contributor
Honored Contributorabout the CONF_DONE in the PS configuration
Dear all, I am trying to configure the Cyclone III device using the Passive Serial mode. In the very beginning, I draw the nCONFIG low, and subsequently the Cyclone III draw the nSTATUS low....the question is: why CONF_DONE is always low from the very beginning? As to the configuration handbook, there should be a high-to-low transition for the CONF_DONE... why?
In addition, there is said to be a low-to-high transition for the CONF_DONE in the end of the configuration, I just want to know, how does the Cyclone device know the configuration is done ? PS. MSEL is 0000, and the clock is 1M, and the file format is .hex. Thanks !37 Replies
Altera_Forum--- Quote Start --- just found a that there are two different documents for this that tell me two different setting for MSEL --- Quote End --- The appropriate Cyclone-series handbook should be the only place you need to look. Which part (full part number please) are you using? Cheers, Dave- Altera_Forum--- Quote Start --- With the modifications, MSEL0 - pulled up to VCCA, MSEL1 & MSEL2 pulled down. The documentation I have says MSEL 0 to VCC and mSEL1 to GND. doesn't mention MSEL2. --- Quote End --- Cyclone III handbook: http://www.altera.com/literature/lit-cyc3.jsp Table 9-7, pp169-170: PS mode MSEL[3:0] = 0000b for standard POR, and 1100b for fast POR. Given that your device does not have MSEL[3] it must be one of the smaller packages. Your setting of MSEL[2:0] = 001b is invalid, it should be 100b or 000b. Cheers, Dave
- Altera_Forum--- Quote Start --- Cyclone III handbook: http://www.altera.com/literature/lit-cyc3.jsp Table 9-7, pp169-170: PS mode MSEL[3:0] = 0000b for standard POR, and 1100b for fast POR. Given that your device does not have MSEL[3] it must be one of the smaller packages. Your setting of MSEL[2:0] = 001b is invalid, it should be 100b or 000b. Cheers, Dave --- Quote End --- Yes that is what I found in my search. The documents I was given and told to use were wrong. They are currently modifying my board now and I should know shortly.
- Altera_Forum--- Quote Start --- Yes that is what I found in my search. The documents I was given and told to use were wrong. They are currently modifying my board now and I should know shortly. --- Quote End --- Fixing the MSEL worked. I was able to send the full compressed .rbf and received the CONF_DONE. Thank you for all your help.
- Altera_Forum--- Quote Start --- Fixing the MSEL worked. I was able to send the full compressed .rbf and received the CONF_DONE. --- Quote End --- Awesome! So no need to skip the first 44 bytes? --- Quote Start --- Thank you for all your help. --- Quote End --- You're welcome. Cheers, Dave
- Altera_Forum--- Quote Start --- So no need to skip the first 44 bytes? e --- Quote End --- No, I did not have to skip the first 44 bytes. I tried that first and it did not work. I had to send the full file.
- Altera_Forum--- Quote Start --- No, I did not have to skip the first 44 bytes. I tried that first and it did not work. I had to send the full file. --- Quote End --- Good to know, thanks! Cheers, Dave
