Re: CPLD in circuit programming

I saw this was discussed a couple of weeks ago but it didn't seem like a
solution was found, so I thought I'd add my 2 cents to the subject.
Apparently, Xilinx used to support programming a CPLD from the TINI and
published an application note to this effect:

http://www.xilinx.com/xapp/xapp351.pdf

Basically, it describes programming of a CPLD via it's JTAG TAP pins by
wiring it to the the following pins on the TINI:

TINI D0 -> CPLD TDI
TINI D1 -> CPLD TMS
TINI PCE0 -> CPLD TCK
CPLD TDO -> TINI D2
TINI CTX -> CPLD Reset

Where it gets interesting is that rather than use the C code used in the
current app note on the subject (http://www.xilinx.com/xapp/xapp058.pdf), it
used an alternate simplified mechanism described in an app note which is no
longer available on the Xilinx site which I was able to find with Google
(www.nalanda.nitc.ac.in/industry/appnotes/xilinx/documents/xapp/xapp326.pdf)
.  I'm sure that the process for programming the CPLD via the TINI was slow
due to data transer speed, but it looks like assuming the programming
instructions are "unrolled" into a byte array, that they're all sent to the
CPLD via a single DataPort.write call, so that the programming speed took
place at the fatest transfer speed supported via the TINI.

The Xapp351 app note describes software for the TINI that at one time was
available for download but which appears to no longer available, probably
because it's unsupported.  I'm posting this in the hopes that someone on
this list downloaded it when the app note was first published and still has
it lying around.

Ed

----- Original Message ----- 
From: "V Efremov" <vefremov-Wuw85uim5zDR7s880joybQ@xxxxxxxxxxxxxxxx>
To: <tini-6tN4nzCoH/hBDgjK7y7TUQ@xxxxxxxxxxxxxxxx>
Sent: Thursday, June 12, 2003 1:43 AM
Subject: [TINI] CPLD in circuit programming

> Hi list,
>
> Has anyone tried programming the xilinx CPLD from the TINIIn400 itself?
> There is an appnote an some source code how to do so from a generic 8051,
> but I wonder what the implications on the bus may be.
>
> Is the XILINX in disconnected (high impedance) state while the programming
> is in progress?
>
> ~Venelin
>
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