On 09/09/2018 07:32 PM, Chintan Patel via USRP-users wrote:
Got it
Any potential risks/pitfalls from a UHD driver standpoint in having
one host connected to two B210s over separate USB 3.0 wires operating
at 30.72Msps in the 2x2 mode?
Thanks
Chintan
You'll likely want them to be on separate controllers, but apart from
the usual "can your system 'keep up'" there's nothing inherently
wrong with having multiple B2xx on a single host.
On Sun, Sep 9, 2018 at 4:37 PM, Neel Pandeya <[email protected]
<mailto:[email protected]>> wrote:
Hello Chintan:
Yes, on the B210, in 1x1 mode, the maximum sampling rate is 61.44
Msps, and in 2x2 mode, the maximum sampling rate is 30.72 Msps.
The tweak/modification that you mention has not been implemented
for the B210.
--Neel Pandeya
On 9 September 2018 at 13:20, Chintan Patel via USRP-users
<[email protected] <mailto:[email protected]>>
wrote:
Hi Marcus,
Thanks for the clarification. So the max rate for two
channels on the B210 is 30.72Msps, right? Reading the 9361
manual, it seems that if one wants to operate in RX-only
(dual-port half-duplex) mode, the 61.44Msps rate might be
achievable (at the expense of no TX). Any idea if this
modification has been tried out on the B210? It would be an
invasive change since the AD9361 digital interface in the FPGA
would need tweaks, but any thoughts on if it was theoretically
possible or not.
Chintan
On Sun, Sep 9, 2018 at 11:33 AM Marcus D. Leech via USRP-users
<[email protected]
<mailto:[email protected]>> wrote:
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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