[hpsdr] Mercury V2.6

[Phil Harman]

Hi Grant,

Yes, you should be able to now put Mercury in any slot. The reason that this 
took so long to track down was that initially neither Bill, KD5DTF, or I 
were able to reproduce the problem.  Graham , KE9H, was able to find a 
combination of boards that enabled me to replicate the problem.

The problem was that the I2S encoder in Mercury would stop for some reason, 
although the simulator showed it working correctly.  Kirk, KD5IRS, used the 
Quartus SignalTap feature to confirm that it was indeed a problem in the I2S 
encoder. I found that by bringing the I2S state machine status out to an 
FPGA pin for testing the problem went away.  Kirk suggested this was due the 
the way Quartus was realising the state machine logic and suggested changing 
a Quartus setting to

Analysis & Synthesis Settings > More Settings> State Machine Settings  = 
User-Encoded

thus forcing the method Quartus would use to implement the state machine. 
This appears to have done the trick - unless someone finds otherwise!

Thanks to all involved - an nice piece of detective work.

73's Phil...VK6APH


----- Original Message ----- 
From: "Grant Hodgson" <grant at ghengineering.co.uk>
To: <hpsdr at hpsdr.org>
Sent: Thursday, February 12, 2009 9:18 PM
Subject: Re: [hpsdr] Mercury V2.6


> ***** High Performance Software Defined Radio Discussion List *****
>
> Phil
>
> Are you able to tell us exactly what the problem was with the Atlas slot
> position, and how it got fixed?
>
> Presumably with V2.6 on Mercury can be put in any slot?
>
> regards
>
> Grant  G8UBN
>
> Phil wrote :-
>
> --snip--
>
> It looks like V2.6 has fixed the card position issue of Mercury on the
> Atlas
> bus. It also fixes a small bug in the spectrum data that is sent to EP4.
>
> --snip--
>
> 73's Phil....VK6APH
>
>
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