Question
Download Solution PDFWhich one of the following layers in PCI express protocol architecture is used for compatibility with PCI, initialization and enumeration of the devices connected to the PCI express?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFLayers in PCI protocol:
The PCI Express protocol consists of a Transaction Layer, a Link Layer, and a Physical Layer.
1.) Transaction Layer
The Transaction Layer contains the Configuration Space, which manages communication with the Application Layer, the RX, and TX channels, the RX buffer, and flows control credits.
2.) Data Link Layer
The Data Link Layer, located between the Physical Layer and the Transaction Layer, manages packet transmission and maintains data integrity at the link level.
It manages the transmission and reception of Data Link Layer Packets (DLLPs).
It generates all transmission cyclical redundancy code (CRC) values and checks all CRCs during the reception.
3.) Physical Layer
The Physical Layer initializes the PCI Express link's speed, lane numbering, and lane width according to packets received from the link and directives received from higher layers.
It is used for compatibility with PCI, initialization, and enumeration of the devices connected to the PCI express.
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