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Re: [Discuss-gnuradio] inband timestamp issues

From: Steve Peters
Subject: Re: [Discuss-gnuradio] inband timestamp issues
Date: Thu, 21 Aug 2008 09:26:29 -0500

> The current inband RX chain looks like:
>    N RX Sample Streams -> N RX Sample FIFOs -> 1 Packet Builder -> 1
> USB FIFO -> FX2 USB Interface
> What it should look like (in my opinion):
>    N RX Sample Streams -> N Packet Builders -> N Packet FIFOs -> N:1
> FIFO MUX -> FX2 USB Interface

I agree with this solution, I think this is what Ketan's idea was that
I explained terribly in my last email.  Hopefully removing the USB
FIFO will allow the extra packet builders room on the chip.

> On a side note, it might be interesting to have a command that can
> turn on the receiver and receive a specific number of inband packets.
> For example, if you know you may be receiving a transmission that is
> only 2ms long in a specific slot, it might be beneficial to only
> schedule 2ms (+/- a guard time) worth of samples to be delivered to
> the host, freeing up more CPU cycles for signal processing and using
> the USB bandwidth a little more efficiently.

I'm not too concerned about this, although it would certainly improve
the flexibility of the receiver.  This might also require redesigning
the usrp_rx mblock, but I'm not confident about that.

> Brian


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