Functional Description
192 Datasheet
5.16.6 Function Level Reset Support (FLR)
The SATA Host Controller supports the Function Level Reset (FLR) capability. The FLR
capability can be used in conjunction with Intel
Virtualization Technology. FLR allows an
operating system in a Virtual Machine to have complete control over a device, including
its initialization, without interfering with the rest of the platform. The device provides a
software interface that enables the Operating System to reset the whole device as if a
PCI reset was asserted.
5.16.6.1 FLR Steps
5.16.6.1.1 FLR Initialization
1. A FLR is initiated by software writing a ‘1’ to the Initiate FLR bit.
2. All subsequent requests targeting the Function will not be claimed and will be
Master Abort Immediate on the bus. This includes any configuration, I/O or
Memory cycles, however, the Function shall continue to accept completions
targeting the Function.
5.16.6.1.2 FLR Operation
The Function will Reset all configuration, I/O and memory registers of the Function
except those indicated otherwise and reset all internal states of the Function to the
default or initial condition.
5.16.6.1.3 FLR Completion
The Initiate FLR bit is reset (cleared) when the FLR reset is completed. This bit can be
used to indicate to the software that the FLR reset is completed.
Note: From the time Initiate FLR bit is written to 1 software must wait at least 100 ms before
accessing the function.
5.16.7 Intel
®
Rapid Storage Technology Configuration
The Intel Rapid Storage Technology offers several diverse options for RAID (redundant
array of independent disks) to meet the needs of the end user. AHCI support provides
higher performance and alleviates disk bottlenecks by taking advantage of the
independent DMA engines that each SATA port offers in the PCH.
• RAID Level 0 performance scaling up to 4 drives, enabling higher throughput for
data intensive applications such as video editing.
• Data security is offered through RAID Level 1, which performs mirroring.
• RAID Level 10 provides high levels of storage performance with data protection,
combining the fault-tolerance of RAID Level 1 with the performance of RAID Level
0. By striping RAID Level 1 segments, high I/O rates can be achieved on systems
that require both performance and fault-tolerance. RAID Level 10 requires 4 hard
drives, and provides the capacity of two drives.
• RAID Level 5 provides highly efficient storage while maintaining fault-tolerance on
3 or more drives. By striping parity, and rotating it across all disks, fault tolerance
of any single drive is achieved while only consuming 1 drive worth of capacity. That
is, a 3 drive RAID 5 has the capacity of 2 drives, or a 4 drive RAID 5 has the
capacity of 3 drives. RAID 5 has high read transaction rates, with a medium write
rate. RAID 5 is well suited for applications that require high amounts of storage
while maintaining fault tolerance.
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