Hi John
For ROACH1 you will still need to instantiate a Xilinx tri-state buffer per
pin and tie the output enable with the external buffer direction (for all
the GPIO pins used).
Henno
On Fri, May 25, 2012 at 2:11 AM, John Ford wrote:
> > Hi all
> >
> > ROACH2 is more flexible and each pin can
Hi John
Since the ROACH2 does not have an external buffer and only uses the FPGA
pin, the yellow block can essentially be a wrapper for the Xilinx
tri-state buffer.
Thus your yellow block will have an input & output + output enable to the
fabric.
Henno
On Fri, May 25, 2012 at 2:11 AM, John F
> Hi all
>
> ROACH2 is more flexible and each pin can be individually configured to
> be input or output. We can implement Dave's suggestion on ROACH but the
> granularity is coarser, we have to configure an entire bank as input or
> output (each bank has a separate external buffer controlled by a
I'm designing a digital data acquisition system using a ROACH1 board. I need to
sample two Nyquist zones at 1024-2048 MHz. It appears that in the Casper group
of products, a pair of ASIAA, ADC1x3000-8, or KatADC boards would work well and
nicely interfaced to a single ROACH1 board (although the
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