Hi,
I'm tried to make a development board for the Cyclone III, most of it works as far as I can tell without the FPGA.
My problem is with the FPGA configuring after I have downloaded the configuration file to the serial memory. Referencing this document I can tell what stage the FPGA is in when powering up. Well nothing happens. The FPGA just sits there with NCONFIG at 1.5V, CONFIG_DONE at 0V and NSTATUS at 0V.
I think there may be something wrong with the FPGA as NCONFIG isn't at 0V, when I pull it low to reset the device and attempt to restart the configuration it drops a little to 1.2V.
I have gone over the pins and connection scheme and unfortunately haven't found any problems!
Attached is my schematic, it has some errors but I have made a rev1.1 schematic and changed those. One of those is the schematic says I'm using 1MB of memory when I'm using 16MB. I show rev1.0 as this is the revision of the board I'm working on.
Thanks for any help!
I'm tried to make a development board for the Cyclone III, most of it works as far as I can tell without the FPGA.
My problem is with the FPGA configuring after I have downloaded the configuration file to the serial memory. Referencing this document I can tell what stage the FPGA is in when powering up. Well nothing happens. The FPGA just sits there with NCONFIG at 1.5V, CONFIG_DONE at 0V and NSTATUS at 0V.
I think there may be something wrong with the FPGA as NCONFIG isn't at 0V, when I pull it low to reset the device and attempt to restart the configuration it drops a little to 1.2V.
I have gone over the pins and connection scheme and unfortunately haven't found any problems!
Attached is my schematic, it has some errors but I have made a rev1.1 schematic and changed those. One of those is the schematic says I'm using 1MB of memory when I'm using 16MB. I show rev1.0 as this is the revision of the board I'm working on.
Thanks for any help!