Functional Description
5.16.8
SATA Device Presence
In legacy mode, the SATA controller does not generate interrupts based on hot plug/
unplug events. However, the SATA PHY does know when a device is connected (if not in
a partial or slumber state), and it s beneficial to communicate this information to host
software as this will greatly reduce boot times and resume times.
The flow used to indicate SATA device presence is shown in Figure 5-11. The ‘PxE’ bit
refers to PCS.P[3:0]E bits, depending on the port being checked and the ‘PxP’ bits refer
to the PCS.P[3:0]P bits, depending on the port being checked. If the PCS/PxP bit is set
a device is present, if the bit is cleared a device is not present. If a port is disabled,
software can check to see if a new device is connected by periodically reenabling the
port and observing if a device is present, if a device is not present it can disable the
port and check again later. If a port remains enabled, software can periodically poll
PCS.PxP to see if a new device is connected.
Figure 5-11. Flow for Port Enable / Device Present Bits
Datasheet
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INTEL [ INTEL ]
