Aspw
On 21 Aug 2014 23:19, "Matt Strader" 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 o
hi matt,
qdr has excellent bandwidth for doing random accesses,
jumping around in memory (eg: it's great for re-ordering data,
corner turns, bit reversing, etc).
qdr is easier to use - fixed, known latency, does reads
and writes simultaneously, but it's more expensive.
.
if your address access is
Hi Matt,
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 dat
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 be
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