
322 The Essential Guide to Serial ATA and SATA Express
PHYs may optionally support Serial ATA II asynchronous signal recovery for those applications
that the SATA usage model of device insertion into a receptacle (power applied at time of insertion)
does not apply to.
Asynchronous signal recovery will require modifications to the following state machines:
When the signal is lost, both the host and the device may attempt to recover the signal. If the
device attempts to recover the signal before the host by issuing a COMINIT, it is unclear what
state the drive is in and whether the drive will return its signature.
If a host supports asyn