Intel 82801EB, Руководство программиста

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Theory of Operation
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SATA Programmer’s Reference Manual 21
Figure 8. Enhanced Configuration
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Intel
®
ICH5
P-ATA
S-ATA
Port 1
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Logical Primary
Port 0
Logical Secondary
BIOS Selectable
S
M
M
S
Note: While the enhanced configuration can support a maximum of six ATA devices, Intel recommends
that its customers limit their platforms to a four-device maximum configuration (applicable to both
compatible and enhanced configuration), as this will provide for an easier transition to a four
SATA device maximum configuration on future ICHs.
4.2.1 PI - Programming Interface Register – Offset 09h
As stated previously, the P-ATA and SATA channels can be configured for either native mode
only or a combination of legacy and native modes. This is controlled via the
Programming
Interface register. The programming interface register is found in both the SATA and P-ATA
functions and can be modified by both BIOS (during POST) and operating system software.
Bit Type Reset Description
7 RO 1 Indicates the SATA controller supports bus master operation.
6:4 RO 0 Reserved
3 RO 1
SOP_MODE_CAP: Indicates that the secondary controller supports both
legacy and native modes.
2 RW 0
SOP_MODE_SEL: Determines the mode that the secondary channel is
operating in.
0 = Legacy PCI mode (Default)
1 = Native PCI mode
1 RO 1
POP_MODE_CAP: Indicates that the primary controller supports both legacy
and native modes.
0 RW 0
POP_MODE_SEL: Determines the mode that the primary channel is
operating in.
0 = Legacy PCI mode (Default)
1 = Native PCI mode