06-01-2012 05:19 PM
I have a board designed with multiples of the same Spartan-6 device connected in a serial daisy chain (total of 8). The first one configured for master serial mode and the remaning in slave serial mode. The master is attached to a single 64Mb SPI device for configuration.
My application uses all 8 devices running the exact same design and therefore only use a single bitstream. Unfortunately, I don't have the space in the SPI flash to store essentially 8 copies of the same design for concatenation; which is how I understand the PROMGen tool to work. Is there a way to save flash space and only store a single copy of this bitstream?
Solved! Go to Solution.
06-01-2012 06:10 PM
See UG380, section titled Ganged Serial Configuration. It describes your design exactly. In UG380 version 2.3, this section begins on page 135.
-- Bob Elkind
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06-04-2012 06:20 PM
Thank you for the reply. That's what my design *should* have been in the first place.
My hardware was routed in a daisy chain as shown in Figure 9-1. I have series termination in-between the DOUT to DIN signals on the slaves. I was able to remove these, rewire the data path to a ganged configuration and deadbug in a thevenin termination at the end. Works great now.