3-Port, 3-Lane, ExtremeLo PCIe 2.0 Packet Switch
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Similar to the role of PCI/PCIX Bridge in PCI/PCIX bus architecture, the function of PCI Express (PCIE) Switch is to expand the connectivity to allow more end devices to be reached by host controllers in PCIE serial interconnect architecture. The 3-lane PCIe Switch is in 3-port type configuration. It provides users the flexibility to expand or fan-out the PCI Express lanes based on their application needs.
In the PCI Express Architecture, the PCIE Switch forwards posted and non-posted requests, and completion packets in either downstream or upstream direction concurrently as if a virtual PCI Bridge is in operation on each port. By visualizing the port as a virtual Bridge, the Switch can be logically viewed as two-level cascaded multiple virtual PCI-to-PCI Bridges, where one upstream-port Bridge sits on all downstream-port Bridges. Similar to a PCI Bridge during enumeration, each port is given a unique bus number, device number, and function number by the initiating software. The bus number, device number, and function number are combined to form a destination ID for each specific port. In addition to that, the memory-map and IO address ranges are exclusively allocated to each port as well. After the software enumeration is finished, the packets are routed to the dedicated port based on the embedded address or destination ID. To ensure the packet integrity during forwarding, the Switch is not allowed to split the packets to multiple small packets or merge the received packets into a large transmit packet. Also, the IDs of the requesters and completers are kept unchanged along the path between ingress and egress port.
Ports | 3 |
---|---|
Lanes | 3 |
Power | 0.7 w |
Latency | 150 ns |
Ambient or Junction Temperature (°C) | -40 to 85 |
Compliance (Only Automotive supports PPAP) | Standard |
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