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Advanced Host Controller Interface (AHCI), Port x Command and Status (PxCMD) register (Offset 18h), bit location 18 (Hot Plug Capable Port (HPCP)) |
When set to “1”, indicates that this port’s signal and power connectors are externally available through a joint signal and power connector for blindmate device hot plug. |
Advanced Host Controller Interface (AHCI), HBA Capabilities (CAP) register (Offset 00h), bit location 5 (Supports External SATA (SXS)) |
When set to ”1”, indicates that the host bus adapter (HBA) has one or more SATA ports that have a signal-only connector that is externally available (such as an eSATA connector). If this bit is set to ”1”, software can refer to the PxCMD.ESP bit to determine whether a specific port has its signal connector externally available as a signal-only connector (that is, power is not part of that connector). When the bit is cleared to ”0”, indicates that the HBA has no SATA ports that have a signal-only connector that is externally available. |
Advanced Host Controller Interface (AHCI), Port x Command and Status (PxCMD) register (Offset 18h), bit location 21 (External SATA Port (ESP)) |
When set to ”1”, indicates that this port’s signal connector is externally available on a signal-only connector (such as an eSATA connector). When set to ”1”, CAP.SXS shall be set to ”1”. ESP is mutually exclusive with the HPCP bit in this register. If ESP is set to ”1”, then the port may experience hot plug events. |