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AR# 33522

11.3 Spartan-6 FPGA PlanAhead tool - I cannot constrain my differential inputs in banks 1 and 3 for Spartan-6 devices

Description

Keywords: differential, inputs, banks

PlanAhead software does not allow me to constrain my differential inputs to valid locations in banks 1 and 3 in Spartan-6 devices.

Why is the PlanAhead software preventing me from performing this task?

Solution

This is a known issue with the PlanAhead tool in 11.3. The PlanAhead software should allow differential inputs to be constrained in banks 1 and 3 in Spartan-6 devices. This problem is scheduled to be fixed in a future version of the PlanAhead tool.

To work around this issue, you must manually constrain your differently inputs in the UCF.

AR# 33522
Date Created 09/16/2009
Last Updated 09/16/2009
Status Active
Type General Article