Legacy Mode; Native Mode - HP Compaq dx7200 MT Reference Manual

Serial and Parallel ATA Drive Guidelines and Features

4.8.1 Legacy Mode

The Legacy mode is used to access devices attached to an embedded ATA 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

4.8.2 Native Mode

The native mode is used to access devices attached to SATA controllers and is the default mode
for all integrated SATA controllers. It 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
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