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[time-freq] Reflock II observations

Steven Bible n7hpr at tapr.org
Sun Nov 20 20:11:01 UTC 2005

Hi Bobby,

Email me privately your mailing address and I'll send you a ByteBlasterMV
Clone kit that I am working on.  I am attaching the schematic and PCB layout
for all to see and comment.  I am trying to keep it simple and inexpensive.

There's two ways to connect this with the Reflock, 1) with a 10-pin
connector on the bottom of the clone PCB, or 2) with a small length of
ribbon cable with IDC connectors at both ends.

I wanted the kit to be 1) as it is the simplest and cheapest.  The down side
(me thinks) is the stress on the connector when plugged into the Reflock II.
This may not be a problem for most people because they will be programming
their Reflocks and unplugging the clone board.  I am concerned for those
that would like to do development work and leave the clone board plugged in.
Then the 2) idea is better.

Comments and ideas are welcome.


- Steve, N7HPR
 (n7hpr at tapr.org)

> -----Original Message-----
> From: time-freq-bounces at lists.tapr.org
> [mailto:time-freq-bounces at lists.tapr.org]On Behalf Of Lyle Johnson
> Sent: Sunday, November 20, 2005 12:18 PM
> To: TAPR time and frequency projects
> Subject: Re: [time-freq] Reflock II observations
> > First: I built a Byteblaster clone from a schematic found at:
> >
> http://opencollector.org/history/freecore/Build%20your%20own%20Byt
> eBlaster!.htm
> > It's the same connections as Altera's schematic, but much easier to
> > read w/ connector outlines.
> > I added a Berg type jumper/selector to allow the 74LS244 Vcc to be
> > optionally powered externally,
> > in my case I set it to 4.5V but suspect 5.0V would have made no
> difference.
> Be careful!  The Quartus II software lists the Byte Blaster II and *not*
> the earlier Byte Blaster when programming the MAX II for a reason.  The
> absolute voltage limit on any pin of a MAX II device is34.6V, and the
> maximum recommended voltage is 3.3V.
> If you are going to use a homebrew programmer, be *sure* it works
> properly with the interface voltage *supplied* by the programming
> connector on the Reflock II. The Byte Blaster II and Byte Blaster MV
> allow the CPLD side to run on voltages like 3.3, 2.5 and 1.8 which is
> required for many of the newer parts from Altera.
> 73,
> Lyle KK7P
> _______________________________________________
> time-freq mailing list
> time-freq at lists.tapr.org
> https://lists.tapr.org/cgi-bin/mailman/listinfo/time-freq
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