• If the coherency attribute is sharable or exclusive, a write invalidate protocol is in effect, and the processor issues an invalidate request. The processor cannot complete the store until the external agent signals an acknowledge for this invalidate request.
• If the coherency attribute is update, a write update protocol is in effect, and the processor issues an update request. The processor cannot complete the store until the external agent signals an acknowledge for this update request.

No-Secondary-Cache Mode