SATA Controller Registers (D31:F2) (Desktop and Mobile Only)
ICH7 Family Datasheet
Supports Activity LED (SAL) — RO. Indicates that the SATA controller supports
a single output pin (SATALED#) which indicates activity.
Supports Command List Override (SCLO) — R/WO. When set to 1, indicates that
the HBA supports the PxCMD.CLO bit and it's associated function. When cleared to
'0', The HBA is not capable of clearing the BSY and DRQ bits in the Status register
in order to issue a software reset if these bits are still set from a previous
Interface Speed Support (ISS) — R/WO. Indicates the maximum speed the
SATA controller can support on its ports.
2h =3.0 Gb/s.
Interface Speed Support (ISS) — RO. Indicates the maximum speed the SATA
controller can support on its ports.
1h =1.5 Gb/s.
Supports Non-Zero DMA Offsets (SNZO) — RO. Reserved, as per the AHCI
Revision 1.0 specification
Supports Port Selector Acceleration — RO. Port Selectors not supported.
Supports Port Multiplier (PMS) — R/WO. ICH7 does not support port multiplier.
BIOS/SW shall write this bit to ‘0’ during AHCI initialization.
Supports Port Multiplier FIS Based Switching (PMFS) — RO. Reserved, as per the
AHCI Revision 1.0 specification.
NOTE: Port Multiplier not supported by ICH7.
PIO Multiple DRQ Block (PMD) — R/WO. The SATA controller supports PIO
Multiple DRQ Command Block
Slumber State Capable (SSC) — RO. The SATA controller supports the slumber
Partial State Capable (PSC) — RO. The SATA controller supports the partial state.
Number of Command Slots (NCS) — RO. Hardwired to 1Fh to indicate support for
Reserved. Returns 0.
Number of Ports (NPS) — RO. Hardwired to 3h to indicate support for 4 ports. Note
that the number of ports indicated in this field may be more than the number of
ports indicated in the PI (ABAR + 0Ch) register.