PCI Express System Architecture

Producer/Consumer Model

Readers familiar with the Producer/Consumer programming model may choose to skip this section and proceed directly to “Native PCI Express Ordering Rules” on page 318.

The Producer/Consumer model is a common methodology that two requestercapable devices might use to communicate with each other. Consider the following example scenario:

1.	A network adapter begins to receive a stream of compressed video data over the network and performs a series of memory write transactions to deliver the stream of compressed video data into a Data buffer in memory (in other words the network adapter is the Producer of the data).
2.	After the Producer moves the data to memory, it performs a memory write transaction to set an indicator (or ...