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Theory of Operation
Figure 7. Compatible Configuration - Option 3d
Note: In the figure above, devices represented by dotted lines may be attached, but are not accessible to
software.
4.2
Enhanced Configuration
The enhanced configuration is intended for those operating systems (e.g., Microsoft Windows*
2000, Windows* XP) that comprehend both legacy and native modes of operation. It is the
preferred configuration for system software due to the maximum flexibility that it offers. Enhanced
mode allows both the P-ATA and SATA host controllers to be used, providing a maximum of six
ATA (4 P-ATA + 2 SATA) devices that can be used simultaneously.
Note: In this configuration, the P-ATA controller must be programmed for legacy mode while the SATA
controller must be programmed for native mode of operation. Figure 8 illustrates the enhanced
mode configuration:
20
S-ATA
Intel® ICH5
P-ATA
S
Port 0
Logical Secondary
Channel
Port 1
M
Logical Primary
S
Channel
M
Physical Secondary
S
Channel
Not Used
M
SATA Programmer's Reference Manual
R
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