Hi, my setup is as follows:
I am able to have the DSP load itself from flash but after it's done loading, I would like the DSP to tell the FPGA to load itself from the same flash. They will be sharing address and data lines and cannot operate at the same time.
I am wondering if there is a way for the DSP to tell the FPGA to load itself from Flash. Is there a special pin on the FPGA for that. Thanks. Amish
Amish,
Hold PROG_b low until it is time to configure? That holds off configuration until PROG_b is released.
Austin
My concern would be what do the DSP and FPGA pins output when they are in reset mode or while programing. It would be an issue if both are driving the address line of the FLASH while one is trying to program itself. Amish
Amish,
While PROG_b is held low, all IO is tristate on the FPGA.
Aust> >> Amish,
Actually, you're concerned about preventing the FPGA from configuring itself and becoming active too early...
Maybe you can have the DSP configure the FPGA : once it has loaded its program from the flash, the DSP can read (at a specific flash address) the FPGA bitstream and send it to the FPGA (via SPI, parallel, whatever). This way you specify where your bitstream is stored in the flash...
This is how it is currently done but then we become dependent on the DSP to load the code introducing a single point of failure. I would like to be able to load the code from Flash independently of the DSP if the DSP stops working. Amish
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