HP dx2700 Service Reference Guide: HP Compaq dx2700 MT/dx2708 MT/dx2700 SFF Bu - Page 29

Legacy Mode, 5.2 Native Mode, Control Block are found in the PCI Configuration Space.

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Serial ATA Drive Guidelines and Features 4.5.1 Legacy Mode The Legacy mode is used to access devices attached to an embedded SATA controller. Each channel of the controller requires two fixed I/O address ranges and an IRQ. ■ Primary Channel ❏ Command block: 1F0h - 1F7h ❏ Control block: 3F6h ❏ IRQ: 14 ■ Secondary Channel ❏ Command block: 170h - 177h ❏ Control block: 376h ❏ IRQ: 15 4.5.2 Native Mode The native mode is used to access devices attached to additional SATA controllers and is not supported by many legacy operating systems. Addresses are assigned by PCI Plug-n-Play BIOS and the IRQ is shared with multiple controllers. Base Address Registers for the Command and Control Block are found in the PCI Configuration Space. ■ Offset 10h-Primary Command base address ■ Offset 14h-Primary Control base address ■ Offset 18h-Secondary Command base address ■ Offset 1Ch-Secondary Control base address 4-4 431672-001 Service Reference Guide

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431672-001
Service Reference Guide
Serial ATA Drive Guidelines and Features
4.5.1 Legacy Mode
The Legacy mode is used to access devices attached to an embedded SATA controller. Each
channel of the controller requires two fixed I/O address ranges and an IRQ.
■
Primary Channel
❏
Command block: 1F0h - 1F7h
❏
Control block: 3F6h
❏
IRQ: 14
■
Secondary Channel
❏
Command block: 170h - 177h
❏
Control block: 376h
❏
IRQ: 15
4.5.2 Native Mode
The native mode is used to access devices attached to additional SATA controllers and is not
supported by many legacy operating systems. Addresses are assigned by PCI Plug-n-Play BIOS
and the IRQ is shared with multiple controllers. Base Address Registers for the Command and
Control Block are found in the PCI Configuration Space.
■
Offset 10h—Primary Command base address
■
Offset 14h—Primary Control base address
■
Offset 18h—Secondary Command base address
■
Offset 1Ch—Secondary Control base address