Description
According to the DSP User Guide, it is possible to set AREG = 1 and use the A1 register only. Furthermore, to save power, it is possible to set CEA2 = 0.
Map:
WARNING:PhysDesignRules:2175 - Invalid configuration (incorrect pin connections
and/or modes) on block:<DSP_Slice>:<DSP48E1_DSP48E1>. When the DSP48E1 AREG
attribute is set to 1, the CEA2 input pin should have active or VCC
connectivity.
BitGen:
ERROR:PhysDesignRules:2175 - Invalid configuration (incorrect pin connections
and/?or modes) on
block:<Ports.0.PortTop/?TxStrEng/?Chksum/?TSAdj/?MultAdd>:<DSP48E1_?DSP48E1>.
When the DSP48E1 AREG attribute is set to 1,? the CEA2 input pin should have
active or VCC connectivity.
The user guide claims this is a valid configuration. Why are the warnings/errors occurring and how can I avoid this error?