The PHY combo comprises Serial ATA (SATA) compliant with SATA 3.0 Specification, Peripheral Component Interconnect Express (PCIe) compliant with PCIe 2.0 Base Specification supporting PIPE interface spec, and Universal Serial Bus (USB) compliant with USB 3.0, USB 2.0 (USB High-speed and Full speed). Incorporating additional features such as PLL control, reference clock control, and built-in power gating control leads to reduced power usage. Moreover, the PHY is versatile for a wide range of situations with different power consumption needs due to the customizable low power mode setting mentioned above.