82NM10 Datasheet, PDF (490/671 Pages) Intel Corporation – Intel® NM10 Family Express Chipset

SATA Controller Registers (D31:F2)
15.1.35 SIR—SATA Initialization Register
Address Offset: 94h–97h
Default Value: 00000000h
Attribute:
Size:
R/W
32 bits
.
Bit
Description
31:29
30
29:28
27:24
23
22:10
9
Reserved
SATA Capability Registers Disable (SCRD).
When this bit is set, the SATA Capability Registers are disabled. That is, SATA
Capability Registers 0 and 1 are both changed to Read Only with the value of
00000000h. Also, the Next Capability bits in the PCI Power Management Capability
Information Register (D31:F2;Offset 70h bits 15:8) are changed to 00h, to indicate
that the PCI Power Management Capability structure is the last PCI capability
structure in the SATA controller. When this bit is cleared, the SATA Capability
Registers are enabled.
Reserved
SATA Initialization Field 3 (SIF3) — R/W. BIOS shall always program this register to
the value 0Ch. All other values are reserved.
SATA Initialization Field 2 (SIF2) — R/W. BIOS shall always program this register to
the value 1b. All other values are reserved.
Reserved
SCR Access Enable (SCRAE) — R/W. In non-AHCI mode, this bit allows access to
the SATA SCR registers (SStatus, SControl, and SError registers).
0 = The ABAR (Dev31:F2:Offset 24h) register and MSE bit field (Dev31:F2:Offset
04h:bit 1) remain as defined.
1 = The ABAR (Dev31:F2:Offset 24h) register and MSE bit field (Dev31:F2:Offset
04h:bit 1) are forced to be read/write.
NOTES:
1.
Using this mode only allows access to AHCI registers PxSSTS, PxSCTL,
PxSERR. All other AHCI space is reserved when this bit is set.
2.
Proper use of this bit requires:
• ABAR must be programmed to a valid BAR; MSE must be set before software
can access AHCI space.
• The Port Implemented bit (D31:F2, Offset ABAR+0Ch) for the corresponding
port has to be set to allow access to the AHCI port specific PxSSTS, PxSCTL,
and PxSERR registers.
8:0
SATA Initialization Field 1 (SIF1) — R/W. BIOS shall always program this register to
the value 180h. All other values are reserved.
490
Datasheet