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KTD-N0793-0
3.8
Serial ATA Hard Disk interface
The KTGM45 boards have an integrated SATA Host controller that supports independent DMA operation on
four ports and data transfer rates of up to 3.0Gb/s (300MB/s). The SATA controller supports AHCI mode and
has integrated RAID functionality with support for RAID modes 0 and 1.
The board provides five Serial ATA (SATA) connectors which support one device per connector. The
ICH9ME Serial ATA controller offers four independent Serial ATA ports with a theoretical maximum transfer
rate of 3 Gbits/sec per port. One device can be installed on each port for a maximum of four Serial ATA
devices. A point-to-point interface is used for host to device connections, unlike Parallel ATA IDE which
supports a master/slave configuration and two devices per channel.
For compatibility, the underlying Serial ATA functionality is transparent to the operating system. The Serial
ATA controller can operate in both legacy and native modes. In legacy mode, standard IDE I/O and IRQ
resources are assigned (IRQ 14 and 15). In Native mode, standard PCI Conventional bus resource steering
is used. Native mode is the preferred mode for configurations using the Windows XP and Windows Vista
operating systems.
The KTGM45 supports the following RAID (Redundant Array of Independent Drives) levels:
•
RAID 0 - data striping
•
RAID 1 - data mirroring
3.8.1 SATA Hard Disk Connector (SATA0, SATA1, SATA4, SATA5)
SATA:
PIN
1
2
3
4
5
6
7
The signals used for the primary Serial ATA hard disk interface are the following:
Signal
Description
SATA* RX+
Host transmitter differential signal pair
SATA* RX-
Host receiver differential signal pair
SATA* TX+
SATA* TX-
"*" specifies 0, 1, 4, 5 depending on SATA port.
Page 38
Signal
Type
GND
PWR
SATA* TX+
SATA* TX-
GND
PWR
SATA* RX-
SATA* RX+
GND
PWR
KTGM45 Users Guide
Connector Definitions
Pull
Ioh/Iol
Note
U/D
-
-
-
-
-
-
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