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nCE function is related to the AS/AP configuration interface. It's purpose is to tristate the FPGA signals driving a configuraton memory. It can be tied to GND if no external access to a configuration memory (through AS programming connector or embedded processor) is intended.
Your design is missing 1.2V and 2.5V supplies. Both are required by the Cyclone 3 FPGA, read the device manual. Furthermore bypass capacitors at all power supply pins are strongly suggested.
I would always add a serial configuration flash (EPCS or compatible) to the design. It can be programmed through JTAG indirect method.
A single clock input is sufficient for most basic designs.
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Hi, thank you for your prompt response. I also just realized that I missed 1.2V and 2.5V. But the symbol confused me. I thought that all of the VCC pin of the symbol should be connected to 1.2V. Can you please show me which pins are 1.2V, which are 2.5 V according to the symbol?
Also, is it ok if I only use JTAG without AS?
Thanks
Honored Contributor
