Hi, I am trying to build a very simple Spartan3 - based FPGA board. The idea is to have FPGA + Flash PROM & Jtag header and I/Os. Nothing else.
I am running into a problem: Using my DMM, VCCAUX & VCCO seem to be shorted to GND. At this point I am absolutely sure that they are shorted through the Xilinx chip.
Does Xilinx chip need to be programmed with some kind of default configuration, before it can even be powered on? In other words, should there be some kind of *safety configuration* programmed into the Flash PROM, prior to applying power to Xilinx FPGA?
If you have any references, links, suggestions, guidelines for putting a single FPGA chip on a board with nothing other than the basics for programming it, I would be grateful if you point me to them.
I copied my design from Digilent Spartan3 Starter Kit, getting rid of all the *starter kit* peripherals there and just leaving the essentials: JTAG header, Flash PROM, FPGA, expansion I/Os
Thanks!