ID:176226 Can't pack register <name> and I/O node <name> -- one or both nodes have required options turned off

CAUSE: You turned on the Auto Packed Registers logic option, and turned on the Fast Input Register , Fast Output Register , and/or Fast Output Enable Register logic options for either the register or the I/O cell. The specified node can also be a PLL compensated pin in source synchronous mode. However, the Fitter cannot pack the specified register into the I/O cell because the Fast Register option on either the register or the I/O cell is turned off. For the Fitter to pack the register into the I/O cell, both the register and the I/O cell cannot have a Fast Register option turned off.

ACTION: If you don't want the Fitter to pack the nodes, no action is required. Otherwise, make sure the Fast Input Register, Fast Output Register, and/or Fast Output Enable Register options are turned off for both of the nodes.