On 09/09/2018 11:21 AM, Chintan Patel via USRP-users wrote:
Hi,
Two questions on the B210.
1. Generally speaking, are there are known issues transporting two RX
channels at 61.44Msps over USB 3.0 on the B210. I know from a
theoretical standpoint, the 5Gbps capacity of USB 3.0 has enough
capacity to transport the dual-channel 16-bits i/q @ 61.44Msps. I also
know that whether the host can keep up with this throughput depends on
host configuration, load-balancing etc., but wanted to get a general
sense of which bucket it falls under: a) i
quite-typical-and-routine-scenario, b)
possible-but-in-a-particular-context, or c) pushing-the-capabilities
2. Taking this thought a bit further - (our application needs 4
channels), if we had a powerful dedicated host machine, how
feasible/unrealistic is to to have a configuration where the host is
connected to two B210, via separate USB 3.0s and ingesting 4 channels
worth of RX data at 61.44Msps. From a UHD driver standpoint, I am
assuming this would just entail interfacing with two separate
instances of streamers, but is there any pit-fall in the single
host-to-two-B210 approach?
Thanks,
Chintan
It's not a driver or host-beefiness issue with B210. It's the way the
data clocks work on the AD9361 chip, and the interface to the FPGA.
There's simply no way to make the AD9361 chip move two channels of data
out of itself (or, into itself) at the maximum data rate.
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