Input/Output Interfaces

SATA Interfaces

These systems provide one, two, or four serial ATA (SATA) interfaces that can provide certain advantages over legacy EIDE (PATA) interface including:

■Higher transfer rates: up to 1.5 Gb/s (150 MB/s)

■Reduced wiring (smaller cable assemblies)

The SATA interface duplicates most of the functionality of the EIDE interface through a register interface that is equivalent to that of the legacy IDE host adapter.

SATA Programming

The SATA interface is configured as a PCI device during POST and controlled through I/O-mapped registers at runtime. Non-DOS (non-Windows) operating systems may require using Setup (F10) for drive configuration.

SATA Configuration Registers

The SATA controller is configured as a PCI device with bus mastering capability. The PCI configuration registers for the SATA controller function (PCI device #31, function #2) are listed in Table 5-4.

Table 5-4.

SATA PCI Configuration Registers (82801, Device 31/Function 2)

PCI Conf.

 

Reset

PCI Conf.

 

Reset

Addr.

Register

Value

Addr.

Register

Value

 

 

 

 

 

 

00-01h

Vender ID

8086h

0F..1Fh

Reserved

0’s

 

 

 

 

 

 

02-03h

Device ID

24D1h

10-17h

Pri. Cmd, Cntrl.

1 (both)

 

 

 

 

Addrs.

 

 

 

 

 

 

 

04-05h

PCI Command

0000h

18-1Fh

Sec. Cmd, Cntrl.

1 (both)

 

 

 

 

Addrs.

 

 

 

 

 

 

 

06-07h

PCI Status

02B0h

20-23h

BMstr Base Address

1

 

 

 

 

 

 

08h

Revision ID

00h

2C, 2Dh

Subsystem Vender ID

0000h

 

 

 

 

 

 

09h

Programming

8Ah

2E, 2Fh

Subsystem ID

0000h

 

 

 

 

 

 

0Ah

Sub-Class

01h

34h

Capabilities pointer

80h

 

 

 

 

 

 

0Bh

Base Class Code

01h

3Ch

Interrupt Line

00h

 

 

 

 

 

 

0Dh

Master Latency Timer

00h

3Dh

Interrupt Pin

01h

 

 

 

 

 

 

0Eh

Header Type

00h

40-57h

Timing, Control

All 0’s

 

 

 

 

 

 

Technical Reference Guide

361834-002

5-5