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Re: [Discuss-gnuradio] updated packet format on USRP inband signaling
From: |
Eric Blossom |
Subject: |
Re: [Discuss-gnuradio] updated packet format on USRP inband signaling |
Date: |
Sun, 25 Feb 2007 18:07:23 -0800 |
User-agent: |
Mutt/1.5.9i |
On Sun, Feb 25, 2007 at 08:53:51PM -0500, Brian Padalino wrote:
> On 2/25/07, Eric Blossom <address@hidden> wrote:
> >That sounds good. Would you interpret it as a delta-t from the
> >timestamp in the header? I'm thinking about the case where there are
> >multiple DELAY ops in the payload.
>
> It would probably be best to interpret it as a delta from the current
> time tick where each operation would be 1 tick.
>
> If you did it as a delta from the timestamp header, you would have to
> calculate those intermediate deltas - and 32-bit subtractors inside an
> FPGA can run pretty slowly even with the fast carry chains.
>
> Something like:
> OP_WRITE_REG
> OP_DELAY[19]
> OP_I2C_WRITE
>
> I could see this showing OP_I2C_WRITE occuring 20 ticks after OP_WRITE_REG.
>
> What do you think?
I guess I'm concerned that some of the OPS could take more than a
single tick. E.g., I2C or SPI ops. Thoses buses run at something
like 100kHz to 400kHz. If all execution delays are known, then
OP_DELAY seems fine (and easy).
Eric
- [Discuss-gnuradio] updated packet format on USRP inband signaling, Eric Blossom, 2007/02/25
- Re: [Discuss-gnuradio] updated packet format on USRP inband signaling, Brian Padalino, 2007/02/25
- Re: [Discuss-gnuradio] updated packet format on USRP inband signaling, Eric Blossom, 2007/02/25
- Re: [Discuss-gnuradio] updated packet format on USRP inband signaling, Brian Padalino, 2007/02/25
- Re: [Discuss-gnuradio] updated packet format on USRP inband signaling, Eric Blossom, 2007/02/25
- Re: [Discuss-gnuradio] updated packet format on USRP inband signaling, Eric Blossom, 2007/02/25
- Message not available
- Re: [Discuss-gnuradio] updated packet format on USRP inband signaling, Eric Blossom, 2007/02/25
- Re: [Discuss-gnuradio] updated packet format on USRP inband signaling, Brian Padalino, 2007/02/25
- Re: [Discuss-gnuradio] updated packet format on USRP inband signaling,
Eric Blossom <=
- Re: [Discuss-gnuradio] updated packet format on USRP inband signaling, Brian Padalino, 2007/02/25
- Re: [Discuss-gnuradio] updated packet format on USRP inband signaling, Eric Blossom, 2007/02/25
- Re: [Discuss-gnuradio] updated packet format on USRP inband signaling, Brian Padalino, 2007/02/25
- Message not available
- Re: [Discuss-gnuradio] updated packet format on USRP inband signaling, Eric Blossom, 2007/02/26
- Re: [Discuss-gnuradio] updated packet format on USRP inband signaling, Brian Padalino, 2007/02/25
- Re: [Discuss-gnuradio] updated packet format on USRP inband signaling, Eric Blossom, 2007/02/25
Re: [Discuss-gnuradio] updated packet format on USRP inband signaling, David Scaperoth, 2007/02/26
Re: [Discuss-gnuradio] updated packet format on USRP inband signaling, Martin Dvh, 2007/02/26