PCI Express Overview - PLX Technology

Spread Spectrum Clock Support
‣ SSC Systems Supports Single Clock Domain
• Reduces EMI
‣ Supports Two clock domains
• SSC Domain
• Modulated clock input
• Constant clock domain
• Constant clock input
‣ Advantages for having Two clock domains
• Removes requirement for single source clock
• Important for Modular Systems
Host 1
SSC Domain 1
Host 2
SSC Domain 2
PLX PCIe Jan 2007 CUST 23