WARNING:Xst:1290 - Hierarchical block is unconnected in block core . It will be removed from the design.

Hi ,
I have been using ISE for some time. However suddenly without any changes to the design, when I tried synthesis today i got many errors liek the following :
WARNING:Xst:1290 - Hierarchical block <credit_sync_wrapper_I> is unconnected in block <core>.
It will be removed from the design.
Is there any way to prevent ISE from freely removing blocks even though they are clearly connected by signals which can change in any clock cycle. Perhaps a global setting for preventing such optimizations ?

anandy wrote:
Hi ,
I have been using ISE for some time. However suddenly without any changes to the design, when I tried synthesis today i got many errors liek the following :
WARNING:Xst:1290 - Hierarchical block <credit_sync_wrapper_I> is unconnected in block <core>.
It will be removed from the design.
Is there any way to prevent ISE from freely removing blocks even though they are clearly connected by signals which can change in any clock cycle. Perhaps a global setting for preventing such optimizations ?
In general, XST will only remove logic that does not affect any outputs of the overall design.
It is unreasonable that XST would "suddenly without any changes to the design" rip out logic
that was included in a previous build. You are re-running XST, so something must have
"changed in the design." You could instruct XST to leave it all in, but you would then end up with
a design that has more logic, but no more functionality that the one that left it all out.
The most common reasons for large sections of a design to suddenly get ripped out are
missing clocks or constantly asserted resets. Either of these will cause all the downstream
logic to get replaced with constants, and hence ripped out of the design.
-- Gabor

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WARNING:Xst:1290 - Hierarchical block is unconnected in block core . It will be removed from the design.

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