PEX8509-AA25BIG

The key features of the PEX 8509 PCI Express switch include: - 8-lane PCI Express switch with PCIe Gen 1 (2.5Gbps) Integrated SerDes . - Up to eight ports (x1, x2, x4) in a 15mm x 15mm, 196-ball PBGA package with typical power consumption of 1.2 Watts . - Standards compliant with PCI Express Base Specification, r1.1 and PCI Power Management Interface Specification r1.2 . - High performance features such as cut-through with low packet latency, max payload size of 1024 Bytes, non-blocking switch fabric, and full line rate on all ports . - Flexible configuration with 8 flexible and configurable ports (x1, x2, or x4), lane and polarity reversal, and configurable through I2C, Host software, EEPROM, or strapping pins . - PCI Express Power Management supporting various link power management states and device states . - Quality of Service (QoS) features including one Virtual Channel per port and eight Traffic Classes per port . The PEX 8509 device offers PCI Express switching capability conforming to the PCI Express Base specification revision 1.1, enabling scalable high bandwidth, non-blocking interconnects for various applications such as communications platforms, consumer products, servers, storage systems, blade servers, industrial systems, and embedded-control products . In terms of port configurations, the PEX 8509 offers eight lanes and up to eight ports supporting x1, x2, and x4 lane widths, which can be configured symmetrically or asymmetrically for various form factors and applications . The switch also supports hardware fixed and Weighted Round-Robin Ingress Port Arbitration for fine-tuning Quality of Service and efficient use of packet buffers and system bandwidth . Overall, the PEX 8509 PCI Express switch offers a range of key features and capabilities suitable for various applications and configurations.

The PEX 8509 offers four different port configurations: 1) One x1 upstream port and seven x1 downstream ports 2) One x2 upstream port and six x1 downstream ports 3) One x2 upstream port and the downstream ports as one x2 and four x1 4) One x4 upstream port and four x1 downstream ports These configurations provide flexibility for various applications such as communications platforms, consumer products, servers, storage systems, blade servers, industrial systems, and embedded-control products.

The latency of the PEX 8509 architecture when supporting packet cut-thru is 118ns .