Port Multipliers and Selectors 389
Register FIS with the device signature. Waiting for the device signature may cause a legacy BIOS not
to meet fast boot timing requirements.
Staggered Spin-up Support
The Port Multiplier will disable all device ports on power-up or upon receiving a COMRESET signal
over the host port. This feature allows the host to control when each device spins up.
Refer to SATA on how to enumerate a device, including devices that may be spun down because
the port is disabled.
9.3.3 Hot Plug Events
Port Multiplier handling of hot plug events is defined by the hot plug state machines for the host port
and device port.
Upon receiving a COMRESET signal from the host, the Port Multiplier will perform an internal
reset. As part o