62
CMA34CR cpuModule
BDM-610000083
Rev L
SATA Controller Configuration
The CMA34CR has a combined total of six SATA links. Four SATA links reside on the top and bottom PCIe/104
Type 2 connectors (
CN1
and
CN2
).
A fifth is available on a standard SATA data connector (
CN15
), on the South side of the board. The sixth SATA
link connects to the onboard SATA storage.
The SATA links on
CN1
operate at SATA revision 3, with transfers up to 6 GB/s. All other SATA links including
connectors
CN2
,
CN15
, and the onboard storage operate at SATA revision 2, with transfers up to 3 GB/s.
Onboard SATA Storage
The cpuModule was designed to be used in embedded computing applications. In such environments, rotating
media like hard disks are not very desirable. It is possible to eliminate rotating storage devices by placing your
operating system and application software into the cpuModule's onboard SATA storage.
The onboard SATA storage will always be connected through the SATA controller, meaning it will always be
shown as a SATA device.
SATA Links on the PCIe/104 Type Connectors
The SATA links on the top and bottom-side PCIe/104 Type connectors (
CN1
&
CN2
) are connected to a SATA
controller which can be configured for either AHCI or Native IDE in the BIOS Setup. However, the operating
system must support the selected mode for the device to operate correctly. The default configuration for the
controller is AHCI Mode.
Real Time Clock Control
The cpuModule is equipped with a Real Time Clock (RTC) which provides system date and time functions. When
the cpuModule is turned off, a battery must be attached to the Utility Port 2.0 connector (
CN5
) to provide
power to the RTC. Without power, the RTC will lose the date/time information when the system is turned off.
The RTC also provides an “alarm” function. This may be used to generate an interrupt at a particular time and
day. This feature is commonly used to wake up the system from Sleep/Standby to run a scheduled task
(defragment the hard drive, back up files, etc.).
Table 44
SATA Host Controller Modes of Operation
Chipset
Port
Designator
Function
Native IDE Mode
AHCI Mode
0
CN1
, 0
PCIe Type 2 bus (top)
Device 31: Function 2
Device 31: Function 2
1
CN1
, 1
PCIe Type 2 bus (top)
Device 31: Function 2
Device 31: Function 2
2
—
Onboard SATA Storage
Device 31: Function 2
Device 31: Function 2
3
CN2
, 0
PCIe Type 2 bus (bottom)
Device 31: Function 2
Device 31: Function 2
4
CN2
, 1
PCIe Type 2 bus (bottom)
Device 31: Function 5
Device 31: Function 5
5
CN15
SATA Data Connector
Device 31: Function 5
Device 31: Function 5
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