KTGM45 Users Guide
KTD-N0793-L
Page 41
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 four 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)
Note: In according to Intel ICH9ME chipset specification the SATA ports 2 and 3 are not functional. Drivers,
BIOS and this Users Guide do not refer to SATA port 2 and 3, but only SATA ports 1, 2, 4 and 5.
SATA:
PIN
Signal
Type
Ioh/Iol
Pull
U/D
Note
1
GND
PWR
-
-
2
SATA* TX+
3
SATA* TX-
4
GND
PWR
-
-
5
SATA* RX-
6
SATA* RX+
7
GND
PWR
-
-
The signals used for the primary Serial ATA hard disk interface are the following:
Signal
Description
SATA* RX+
SATA* RX-
Host transmitter differential signal pair
SATA* TX+
SATA* TX-
Host receiver differential signal pair
“*” specifies 0, 1, 4, 5 depending on SATA port.
Connector
