BUG in reading and writing registers

[GuoSC1219]

An error will occur during the synthesis and implementation phase if the design only includes registers that are From Processor or only includes those that are To Processor. There will be no issues when both types of registers are included.

[liuweiseu]

We know this bug, and it was mentioned here.

For now, the easiest way to "fix" this is using two registers (From Processor and To Processor) in your design at least.