66 CMA24BT cpuModule
BDM-610000087 Rev A
SATA Controller Configuration
The CMA24BT has two SATA links. One SATA link resides on the top PCIe/104 Type 2 connector (
CN1
),
and the second SATA link connects to the onboard SATA storage. Both may be enabled or disabled through
the BIOS setup.
SATA Port Mappings, by Connector
Table 39 shows the SATA port configuration of the CMA24BT cpuModule:
Onboard SATA Storage
The cpuModule was designed to be used in embedded computing applications. In such environments,
rotating media like hard disks and floppy 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 supports write protection. Write protection is disabled by default and can be
enabled with a menu option in the BIOS setup.
SATA Links on the PCIe/104 Type Connectors
Both SATA links are connected to the Intel E3800 CPU’s SATA controller which can be configured for
either ACHI or IDE mode through the BIOS . However, the operating system must support the selected
mode for the device to operate correctly. The default configuration for the controller is ACHI mode.
When in IDE mode, the user has an additional option to change the IDE emulation mode to Native Mode
or Legacy Mode.When the SATA controller is configured for IDE mode, Native Mode is the default IDE
emulation mode.
Native IDE Mode
Native Mode allows more flexibility than Legacy Mode, as it permits the system to modify the resources
used by the SATA controller. When in Native Mode, the SATA controller only requires a single IRQ. Unlike
Legacy Mode, this IRQ may be changed by the user or the operating system for better distribution of the
system IRQs. When IRQs in the system are more evenly distributed, interrupt latency is minimized. The
base address of the controller may also be modified.
Legacy IDE Mode
When in this mode, the controller will be fixed to use two interrupts: IRQs 14 and 15. Similarly, the I/O
address of the controller will be fixed in the system. When in Legacy Mode, only a primary and secondary
channel may be used in the system.
Table 39 SATA Port Layout
Designator
Physical Position, Index
E3800 Port
Index
Channel Assignment
(Legacy IDE Mode)
CN1
SATA PCIe link 0
0
Primary Master
n/a
Onboard SATA storage
1
Primary Slave
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