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AR# 12339

3.1i NGDBuild - "ERROR:Pack - Unable to pack the following symbols concurrently into an empty IOB component..."

Description

Keywords: NGDBuild, unable, pack, symbols, empty

Urgency: Standard

General Description:
My design (which targets a Spartan-II device) does not have any IBuffers instantiated in the VHDL code and has two locked global clock nets in order to perform normal input functions. When I implement, the following error is reported:

"ERROR:Pack - Unable to pack the following symbols concurrently into an empty IOB component:
PAD symbol "AddressBus<12>.PAD" (Pad Signal = AddressBus<12>)
BUF symbol "C_AddressBus<12>" (Output Signal = N_AddressBus<12>)
The symbol AddressBus<12>.PAD has a constraint (LOC=P185) that specifies an illegal physical site for the component. Please correct the constraint value."

Solution

To avoid this error, instantiate IBUFGs on the two locked global clock nets.
AR# 12339
Date Created 08/15/2001
Last Updated 08/20/2002
Status Archive
Type General Article