Compaq dc7100 HP Compaq dc71xx and dx61xx Series Business Desktop Computers Te - Page 91
SATA Interfaces, SATA Programming, SATA Configuration Registers
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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. Addr. Register Reset Value PCI Conf. Addr. Register Reset Value 00-01h Vender ID 8086h 0F..1Fh Reserved 0's 02-03h Device ID 24D1h 10-17h Pri. Cmd, Cntrl. Addrs. 1 (both) 04-05h PCI Command 0000h 18-1Fh Sec. Cmd, Cntrl. Addrs. 1 (both) 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