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PEX8525 数据表(PDF) 3 Page - PLX Technology |
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PEX8525 数据表(HTML) 3 Page - PLX Technology |
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3 / 4 page  PLX Confidential four x4 downstream ports. The downstream ports can be of differing widths if required. Almost all (non x86 based) high-end microprocessor manufacturers are offering PCI Express interfaces. The PEX 8525 can be directly connected to a processor to fan-out its PCIe port to a larger number of ports for enhanced connectivity as illustrated in Figure 3. x4 x4 x4 x4 MIPS or PowerPC MIPS or PowerPC PEX 8525 PEX 8525 x8 x4 x4 x4 x4 MIPS or PowerPC MIPS or PowerPC MIPS or PowerPC MIPS or PowerPC PEX 8525 PEX 8525 PEX 8525 PEX 8525 x8 Figure 3. Fan out for PowerPC/MIPS CPUs Embedded Systems The PEX 8525 can also be utilized in embedded applications. Figure 4 shows several independent modules connecting through the PEX 8525. The port widths for each module can be configured as required. The peer-to-peer communication feature of the PEX 8525 allows these modules to communicate with each other without any centralized control. Local Bus Local Bus CPU Bus x8 x4 x4 x8 PEX 8525 PEX 8525 PEX 8525 PEX 8525 FPGA/ASIC FPGA/ASIC FPGA/ASIC FPGA/ASIC FPGA/ASIC FPGA/ASIC FPGA/ASIC FPGA/ASIC CPU CPU CPU CPU Control Control Control Control DSP DSP DSP DSP CPU CPU CPU CPU Sensor Sensor Sensor Sensor Bridge Bridge Bridge Bridge Bridge Bridge Bridge Bridge Bridge Bridge Bridge Bridge Bridge Bridge Bridge Bridge Figure 4. Embedded Systems Peer to Peer Communication Figure 5 represents a backplane where the PEX 8525 provides peer-to-peer data exchange for up to four line cards where the CPU/Host plays the management role. x8 Host Host Host Host x4 PEX 8525 PEX 8525 PEX 8525 PEX 8525 I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O x4 x4 x4 x4 Figure 5. Peer-to-Peer Usage Graphics Fan-out Switch As PCIe based graphics cards become more mainstream, it will be necessary to take a x8 port on the root complex device and fan it out to two x8 ports for dual graphics applications. Root Complex (Northbridge) devices are available with multiple PCIe ports. These ports can be further expanded to connect to a larger number of I/Os or to support dual-graphics using the PEX 8525 as shown in Figure 6. In this dual graphics application example, a x8 port on the root complex device is fanning out to two PCIe graphics cards via x8 links. The figure also shows how some of the ports can be bridged to provide PCI or PCI-X slots through the use of the ExpressLane PEX 8114 and PEX 8111 PCIe bridging devices. x1 PEX 8111 PEX 8532 PEX 8114 PEX 8114 PEX 8525 PEX 8525 x8 x8 PEX 8111 PEX 8111 x4 x1 x8 PEX 8516 PEX 8516 CPU CPU x8 Memory Memory HDD HDD GbE GbE USB USB PCI PCI Root Complex Root Complex South Bridge South Bridge x1 PEX 8111 PEX 8532 PEX 8114 PEX 8114 PEX 8114 PEX 8114 PEX 8525 PEX 8525 PEX 8525 PEX 8525 x8 x8 PEX 8111 PEX 8111 PEX 8111 PEX 8111 x4 x1 x8 PEX 8516 PEX 8516 PEX 8516 PEX 8516 CPU CPU CPU CPU x8 Memory Memory Memory Memory HDD HDD GbE GbE USB USB PCI PCI HDD HDD HDD HDD GbE GbE GbE GbE USB USB USB USB PCI PCI PCI PCI Root Complex Root Complex Root Complex Root Complex South Bridge South Bridge Figure 6. Dual Graphics Fan-out PCI Express Port Expansion The PEX 8525 enables designers to take, for example, two x8 PCIe ports and expand them into eight downstream ports. Some of these PCIe ports can be bridged to PCI or PCI-X using bridging products from PLX. Figure 7 illustrates one of the many configurations the PEX 8525 can support. HDD HDD GbE GbE USB USB PCI PCI HDD HDD HDD HDD GbE GbE GbE GbE USB USB USB USB PCI PCI PCI PCI North Bridge North Bridge North Bridge North Bridge Memory Memory Memory Memory CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU CPU South Bridge South Bridge South Bridge South Bridge PEX 8525 PEX 8525 PEX 8525 PEX 8525 PEX 8111 PEX 8111 PEX 8111 PEX 8111 PEX 8114 PEX 8114 PEX 8114 PEX 8114 x8 x4 x4 x4 x4 x8 x4 x4 x1 x4 PEX 8525 PEX 8525 PEX 8525 PEX 8525 Figure 7. PCIe Port Expansion |
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