Datasheet 611
SATA Controller Registers (D31:F2)
14.4.2.10 PxSSTS—Port [5:0] Serial ATA Status Register (D31:F2)
Address Offset: Port 0: ABAR + 128h Attribute: RO
Port 1: ABAR + 1A8h
Port 2: ABAR + 228h (if port available; see Section 1.3)
Port 3: ABAR + 2A8h (if port available; see Section 1.3)
Port 4: ABAR + 328h
Port 5: ABAR + 3A8h
Default Value: 00000000h Size: 32 bits
This is a 32-bit register that conveys the current state of the interface and host. The
PCH updates it continuously and asynchronously. When the PCH transmits a COMRESET
to the device, this register is updated to its reset values.
Bit Description
31:12 Reserved
11:8
Interface Power Management (IPM) — RO. Indicates the current interface state:
All other values reserved.
7:4
Current Interface Speed (SPD) — RO. Indicates the negotiated interface
communication speed.
All other values reserved.
The PCH supports Gen 1 communication rates (1.5 Gb/s), Gen 2 rates (3.0 Gb/s) and
Gen 3 rates (6.0 Gb/s) (supported speeds are determined by SKU; see Section 1.3)
3:0
Device Detection (DET) — RO. Indicates the interface device detection and Phy
state:
All other values reserved.
Value Description
0h Device not present or communication not established
1h Interface in active state
2h Interface in PARTIAL power management state
6h Interface in SLUMBER power management state
Value Description
0h Device not present or communication not established
1h Generation 1 communication rate negotiated
2h Generation 2 communication rate negotiated
3h Generation 3 communication rate negotiated
Value Description
0h No device detected and Phy communication not established
1h Device presence detected but Phy communication not established
3h Device presence detected and Phy communication established
4h
Phy in offline mode as a result of the interface being disabled or
running in a BIST loopback mode
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