| CAUSE: | The source of the global buffer GLOBAL is something other than an INPUT pin or another GLOBAL buffer. No logic is allowed between the GLOBAL buffer and the INPUT pin or GLOBAL buffer that feeds it, unless the device requires a NOT gate between the GLOBAL buffer and the INPUT pin. (Two GLOBAL buffers in a row are redundant but not illegal.) |
| ACTION: | Use an INPUT pin primitive for a global signal pin, then feed the signal to a GLOBAL primitive. No logic or primitives are permitted between the GLOBAL primitive and the INPUT pin except another GLOBAL primitive, or in some cases, a NOT gate. |
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