User guide

User Guide CC3-CAJUN • Low Power CompactPCI CPU
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EKF Elektronik GmbH • Philipp-Reis-Str. 4 • 59065 Hamm • Germany
Tel. [phone] • Fax. [phone] • [e-mail] • www.ekf.com
Enhanced IDE / ATA Interface
The EIDE interface (also referenced as ATA or PATA = Parallel ATA) is responsible for the
exchange of information between the processor and peripheral mass storage devices such as
hard disks, ATA CompactFlash cards and optical drives. The interface supports:
C Up to three ATA devices (2 IDE, 1 CompactFlash)
C PIO Mode 3/4, Ultra ATA/33, Ultra ATA/66, Ultra ATA/100
C Support for LS-120 drives
The primary IDE interface is routed to a standard 40-position header (2.54mm pitch), allowing
master and slave device attached to one common flat ribbon cable (use special 80-pin cabling
assembly for Ultra ATA/66 and Ultra ATA/100 operation).
The presence of an 80-pin cable at the primary IDE interface could be checked out by reading
the state of the GPI1 of the Firmware Hub (FWH). The ATA standard defines the signal
PDIAG-/CBLID- for identifying the cable. This line is routed to GPI1 of the FWH. A logical 1
signals a 40-pin, a logical 0 a 80-pin cable. See the ATA/ATAPI-6 specification (section 6.7 “Host
determination of cable type by detecting CBLID-“) for details.
As an alternate, the primary IDE port is optionally also available for rear I/O across the J2/P2
CompactPCI connector. The CTY-RIO rear I/O transition module is provided with both, a 40-
position header for 3.5-inch PATA hard disks and IDE optical drives, and a 44-position header
for 2.5-inch IDE hard disk drives.
The secondary IDE interface is routed to the on-board CompactFlash Card Adapter socket. Use
this connector to attach a CompactFlash ATA style silicon disk, whenever a hard disk is not
suitable for your system, or as an additional mass storage device, or even as the boot device.
The display LED 'ATA', situated in the front panel signals the disk activity status of the primary
IDE devices and also the CompactFlash slot. This LED is also software programmable. See the
section “Programmable LED” how to do this.
The IDE controller is integrated into the i82801 ICH2 (I/O Controller Hub 2). The ICH2 is
sometimes also referenced as 'Southbridge'. Ultra ATA IDE drivers may be downloaded from the
Intel website, but are already part of all popular operating systems.