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PEX8649-16U16DAICRDK Datasheet(PDF) 2 Page - PLX Technology |
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PEX8649-16U16DAICRDK Datasheet(HTML) 2 Page - PLX Technology |
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2 / 5 page  © PLX Technology, www.plxtech.com Page 2 of 2 5/14/2009, Version 1.1 PEX 8649, PCI Express Gen 2 Switch, 48 Lanes, 12 Ports The PEX 8649 can also be configured in Multi-Host mode where users can choose up to four ports as host/upstream ports and assign a desired number of downstream ports to each host. In Multi-Host mode, a virtual switch is created for each host port and its associated downstream ports inside the device. The traffic between the ports of a virtual switch is completely isolated from the traffic in other virtual switches. Figure 2 illustrates some configurations of the PEX 8649 in Multi-Host mode where each ellipse represents a virtual switch inside the device. The PEX 8649 also provides several ways to configure its registers. The device can be configured through strapping pins, I 2C interface, host software, or an optional serial EEPROM. This allows for easy debug during the development phase, performance monitoring during the operation phase, and driver or software upgrade. Dual-Host & Failover Support In Single-Host mode, the PEX 8649 supports a Non- Transparent (NT) Port, which enables the implementation of dual- host systems for redundancy and host failover capability. The NT port allows systems to isolate host memory domains by presenting the processor subsystem as an endpoint rather than another memory system. Base address registers are used to translate addresses; doorbell registers are used to send interrupts between the address domains; and scratchpad registers (accessible by both CPUs) allow inter-processor communication (see Figure 3). Multi-Host & Failover Support In Multi-Host mode, PEX 8649 can be configured with up to four upstream host ports, each with its own dedicated downstream ports. The device can be configured for 1+1 redundancy or N+1 redundancy. The PEX 8649 allows the hosts to communicate their status to each other via special door-bell registers. In failover mode, if a host fails, the host designated for failover will disable the upstream port attached to the failing host and program the downstream ports of that host to its own domain. Figure 4a shows a two host system in Multi-Host mode with two virtual switches inside the device and Figure 4b shows Host 1 disabled after failure and Host 2 having taken over all of Host 1’s end-points. PEX 8649 PEX 8649 PEX 8649 PEX 8649 Figure 4a. Multi-Host Host 1 Host 1 Host 1 Host 1 Host 2 Host 2 Host 2 Host 2 End Point End Point End Point End Point End Point End Point End Point End Point End Point End Point End Point End Point End Point End Point End Point End Point Figure 4b. Multi-Host Fail-Over Host 1 Host 1 Host 1 Host 1 End Point End Point End Point End Point End Point End Point End Point End Point End Point End Point End Point End Point End Point End Point End Point End Point Host 2 Host 2 Host 2 Host 2 Hot Plug for High Availability Hot plug capability allows users to replace hardware modules and perform maintenance without powering down the system. The PEX 8649 hot plug capability feature makes it suitable for High Availability (HA) applications. Three downstream ports include a Standard Hot Plug Controller. If the PEX 8649 is used in an application where one or more of its downstream ports connect to PCI Express slots, each port’s Hot Plug Controller can be used to manage the hot-plug event of its associated slot. Every port on the PEX 8649 is equipped with a hot-plug control/status register to support hot-plug capability through external logic via the I 2C interface. SerDes Power and Signal Management The PEX 8649 supports software control of the SerDes outputs to allow optimization of power and signal strength in a system. The PLX SerDes implementation supports four levels of power – off, low, typical, and high. The SerDes block also supports loop-back modes and advanced reporting of error conditions, which enables efficient management of the entire system. Figure 2. Common Multi-Host Configurations PEX 8649 PEX 8649 PEX 8649 PEX 8649 9 x4s 3 x4s PEX 8649 PEX 8649 PEX 8649 PEX 8649 8 x4s 4 x4s PEX 8649 PEX 8649 PEX 8649 PEX 8649 x8 2 x4 3 x8 x8 PEX 8649 PEX 8649 PEX 8649 PEX 8649 x8 2 x4 2 x8 x4 x4 2 x4 |
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