Error while downloading prodram on CPLD

Hello,
I am using XC9572XL High Performance CPLD. Just for a try i wrote simple
program just to equate input to output. The code is synthesized but when I
try to download code on CPLD through iMPACT it fails. Then I checked with
all other options. Device is detected and erased properly but 
1. Checksome fails
2. functional test fails.

Error -- 

ERROR:iMPACT:431 - '1':No vectors present.
ERROR:iMPACT:432 - '1':Functional test terminated

Please help me out.

Regards 

Sanika

sanika wrote:
> Hello,
> I am using XC9572XL High Performance CPLD. Just for a try i wrote simple
> program just to equate input to output. The code is synthesized but when I
> try to download code on CPLD through iMPACT it fails. Then I checked with
> all other options. Device is detected and erased properly but 
> 1. Checksome fails
> 2. functional test fails.
> 
> Error -- 
> 
> ERROR:iMPACT:431 - '1':No vectors present.
> ERROR:iMPACT:432 - '1':Functional test terminated
> 
> Please help me out.
If you don't write the test vectors yourself, or use a program to create 
them, then there are no test vectors to test the chip against. 
Functional test applies a stimulus to the chip and observes for correct 
output.

You probably just want to readback the programming pattern to verify 
correct programming, but impact does that every time anyway.

Jon

Thanks 
But what could be the reason for program fail..Is CPLD faulty in that
case?

Regards
Sanika

sanika wrote:
> Thanks 
> But what could be the reason for program fail..Is CPLD faulty in that
> case?
No.  The message is saying that it can not find any test patterns to 
check the chip against, therefore the functional test cannot be performed.

Jon