Impact, SVF, assumed TCK frequency?

[Petter Gustad]

In SVF files generated by impact there will be delay statements on the
form:

// Loading device with a 'ferase' instruction.
...
RUNTEST 15000000 TCK;

What is the minimum delay as a result of this statement, i.e. what is
the assumed TCK frequency for impact generated SVF files?

TIA
Petter

--
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?

 

[Amontec Team]

Petter Gustad wrote:

In SVF files generated by impact there will be delay statements on the
form:

// Loading device with a 'ferase' instruction.
...
RUNTEST 15000000 TCK;

What is the minimum delay as a result of this statement, i.e. what is
the assumed TCK frequency for impact generated SVF files?

TIA
Petter

In the Xilinx SVF file, the assumed TCK is the maximum TCK frequency of

the device. Look the datasheet of the FPGA or your CPLD (between 10 to
40 MHz).

Laurent
www.amontec.com
__________________________________
Q01 2004 -> Amontec will introduce
a new USB JTAG POD based SVF !
==================================

 

[Petter Gustad]

Amontec Team <laurent.gauch@www.DELALLCAPSamontec.com> writes:

Petter Gustad wrote:
In SVF files generated by impact there will be delay statements on the
form:

// Loading device with a 'ferase' instruction.
...
RUNTEST 15000000 TCK;

What is the minimum delay as a result of this statement, i.e. what is
the assumed TCK frequency for impact generated SVF files?

TIA
Petter

In the Xilinx SVF file, the assumed TCK is the maximum TCK frequency of
the device. Look the datasheet of the FPGA or your CPLD (between 10 to
40 MHz).

Hmmm. But when there's a chain of different devices, or even other
brand names than Xilinx... I guess impact will use the lowest speed in
the chain based upon the attribute in the BSDL files:

attribute TAP_SCAN_CLOCK of TCK : signal is (10.00e6,BOTH);

Is my assumption correct?

Petter
--
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?

 

[Neil Glenn Jacobson]

The assumed frequency is 1MHz, this is documented in SVF app notes and
the iMPACT user guide.

If you wish to get absolute time generated in the RUNTEST records you
can use the associated preference (Edit->Preferences)

Petter Gustad wrote:

In SVF files generated by impact there will be delay statements on the
form:

// Loading device with a 'ferase' instruction.
...
RUNTEST 15000000 TCK;

What is the minimum delay as a result of this statement, i.e. what is
the assumed TCK frequency for impact generated SVF files?

TIA
Petter