XAPP176 defines how to read back the configuration file but doesn't state whether this can be done while the device is operating normally?
Anthony
- posted
19 years ago
Spartan II/E Configuration readback
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- Vote on answer
- posted
19 years ago
Readback can be done while the FPGA is operational. But ... readback includes the state of the flipflops and the LUTs. Since FFs will be changing, and you may be using some of the LUTs as RAM, the readback will be dependent on the state of your design, which wil be changing while you are doing the readback. You may want to read up on the .LL file created by bitgen, which will help you separate the static bits from the dynamic bits of the readback data.
Philip
Philip Freidin Fliptronics