[Gb-ccb] FPGA I/O pin usage scenarios

[Richard Lacasse]

Martin,

Martin Shepherd wrote:

> Dear all,
> 
> In order to help resolve the questions surrounding how many FPGAs will
> be needed by the CCB, and in what configuration, I have documented my
> best estimates of the number of pins actually needed in the various
> configurations. This can be found at
> 
>   http://www.astro.caltech.edu/~mcs/GBT/ccb_fpga_scenarios.pdf

This is a nice piece of work.  Quite enlightening!
> 
> [snip]
> 
> My personal preference is for either the 1 master + 2 slave
> configuration, or the 1 master + 4 slave configuration, probably with
> the original USB 1.1 interface.
> 

I agree.  These partition the logical design nicely and lend themselves to nice 
board designs.

Rich