CP605
Functional Description
ID 25095, Rev. 07
© 2004 Kontron Modular Computers GmbH
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2.5.13
EIDE Interfaces
The EIDE interface supports the following modes:
• Programmed I/O (PIO): CPU controls data transfer.
• 8237-style DMA: DMA offloads the CPU, supporting transfer rates of up to 16 MB/sec.
• Ultra DMA: DMA protocol on IDE bus supporting host and target throttling and transfer
rates of up to 33 MB/sec.
• ATA-66: DMA protocol on IDE bus supporting host and target throttling and transfer rates
of up to 66 MB/sec. ATA-66 protocol is similar to Ultra DMA and is device driver
compatible.
• ATA-100: DMA protocol on IDE bus allows host and target throttling. The ICH4 ATA-100
logic can achieve read transfer rates of up to 100 MB/sec and write transfer rates up to
88 MB/sec.
Figure 2-8: EIDE Interface Connectors CON12 and CON19
There are two independent EIDE ports available. The primary port is connected to the optional
44-pin, 2-row male connector, CON12, and to the onboard CompactFlash socket, CON16. The
secondary EIDE interface is a 40-pin, 2-row male connector, CON19, AT standard interface for
an EIDE hard disk. The secondary port is also connected to the CompactPCI rear I/O interface.
If CON19 is connected to an EIDE device, it is not allowed to connect an EIDE device to the
REAR I/O connector CON7 at the same time, and vice versa, if an EIDE device is connected
to the REAR I/O connector CON7, CON 19 must not be connected to an EIDE device.
Each EIDE interface provides support for two devices (one master and one slave) and the two
EIDE interfaces together, therefore, support a maximum of 4 devices. All hard disks can be
used in cylinder head sector (CHS) mode with the BIOS also supporting the logical block
addressing (LBA48) mode. LBA48 supports hard disks with a capacity greater than 137 GB.
44
2
1
43
CON12
1
2
39
40
CON19
