EP80579 Datasheet, PDF (883/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
Figure 23-2. Hardware Flow for Port Enable/Device Present Bits
PxE bit Set by
Software
Host
releases
COMRESET
Host
COMWAKE
Host
COMRESET
Host
calibrate
Host
releases
COMWAKE
Host
d10.2
Host
Align
Host
data
Host TX
(Device
RX)
Device
TX (Host
RX)
Device
COMINIT
PxP bit set
by HBA
Device
releases
COMINIT
Device
Calibrate
Device
Align
Device
COMWAKE
Device
data
23.5.8.3
23.5.9
Notes:
1.
The SATA host controller’s COMRESET length will be 6 data bursts.
Software Flow
The software flow will be as follows:
• Sometime after power-on reset or resume from suspend, software will set the
PCS.PxE bits, depending on which ports it wants to scan. They can both be set
together.
• The SATA specification indicates that the COMRESET sequence to device detection
is to be 880 us. For best results, software should wait some period longer than this,
such as 10 ms.
• Software will read the PCS.PxP bits. If the bit is set, a device is present. If the bit is
cleared, a device is not present.
If a port was disabled, software checks to see if a new device is connected by
periodically re-enabling the port, and waiting 2-3ms to see if a device is present. If one
is not, 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.
SMI Generation
The SATA controller can generate SMIs on behalf of accesses to the task file. These
SMIs are used to support legacy operating systems running APM (advanced power
management). These SMIs are not used when the controller is an ACPI or PCI power
managed device.
To support SMI generation, trap registers exist in power management space. These
registers can be found at the PMBASE + 48h region. The register bits are:
D0_TRP_EN: Primary IDE master (port 0)
D1_TRP_EN: Primary IDE slave (port 1)
August 2009
Order Number: 320066-003US
Intel^® EP80579 Integrated Processor Product Line Datasheet
883