HP dx7200 HP Compaq Business PC dx7200 MT Service Reference Guide, 1st edition - Page 60

Legacy Mode, 4.8.2 Native Mode, Offset 1Ch-Secondary Control base address

Page 60 highlights

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 4-6 390812-001 Service Reference Guide, dx7200

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4–6
390812-001
Service Reference Guide, dx7200
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