Aspw
On 21 Aug 2014 23:19, "Matt Strader" <mstra...@physics.ucsb.edu> wrote:
>
> Hi Casperites,
>
> We (UCSB and Fermilab) are currently designing a new DAC/ADC board
(12bits x 2.0 Gsps ADC, 14bits x 2.5 Gsps DAC) to interface with the ROACH2
for readout of future, larger MKID instruments. The DAC/ADC board will
have it's own FPGA and it's own memory.
>
> We're currently deciding between adding QDRII+ SRAMs or DDR3 SDRAM chips
to the board. My very limited experience with QDR and DDR2 on
ROACH1 suggests QDR is simpler to work with (because of the constant
latency), but it would take up many more pins on the FPGA for the width of
the data they provide. Does anyone have other ideas of why to choose one
over the other? If you were to design a board from scratch, which would
you choose?
>
> Thanks,
> Matt Strader
> UCSB Physics oDeptford a ad
