Re: [ARTIQ] FW: initial specification of the project

2016-03-26 Thread Sébastien Bourdeauducq 
On Saturday, 26 March 2016 4:06:17 PM HKT Slichter, Daniel H. (Fed) wrote:
> The cost savings from using FMC, which might amount to $50 per AMC, are not
> worth if the crosstalk will make the cards not useful for researchers.  

It's not only about cost of the connector - the RF daughter cards will often 
need some digital signals (e.g. SPI) for control. FMC provides plenty of pins 
for that. Mixing two different types of board-to-board connectors will cause 
mechanical problems and I think we should not do that. If two types of 
connectors are needed, one of them should use cables.

Sébastien

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[ARTIQ] Fwd: analog extension cards

2016-03-26 Thread Robert Jördens 
Nobody wants to use the FMC connectors without testing them. The FMC
connectors will in all likelihood only be the limiting factor if _no_
shielding is used for the other parts. That includes shielding for the
clock generation, the DACs/ADCs the connection to the analog daughter
boards, and the daughterboards themselves.
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[ARTIQ] Fwd: RE: FW: initial specification of the project

2016-03-26 Thread Sébastien Bourdeauducq 
--  Forwarded Message  --

Subject: RE: FW: initial specification of the project
Date: Friday, 25 March 2016, 12:24:02 PM HKT
From: Grzegorz Kasprowicz 
To: 'Robert Jördens' , 'Sébastien Bourdeauducq' 
CC: 'Joe Britton' 

Hi all.
Of course we can to for SFP+, but with QSFP we get much higher bandwidth. 
There are also popular QSFP to SFP cables capable of 10Gbit/s operation.
Best regards,
Greg

-Original Message-
From: Robert Jördens [mailto:r...@m-labs.hk] 
Sent: Thursday, March 24, 2016 11:48 AM
To: Sébastien Bourdeauducq 
Cc: Grzegorz Kasprowicz ; Joe Britton 

Subject: Re: FW: initial specification of the project

Hello all,

thanks for the documents. On top of Sébastien's questions and remarks:
Can we go for plain SFP(+) and not QSFP? Then even 4 channels might fit onto a 
single-width card.

Robert.


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