Product specifications

VT8235 V-Link South Bridge
Revision 1.22 October 24, 2002 -94- Device 17 Function 1 Enhanced IDE Controller Registers
Offset 13-10 - Pri Data / Command Base Address..........RW
Specifies an 8 byte I/O address space.
31-16 Reserved ..........................................always read 0
15-3 Port Address.......................................default=01F0h
2-0 Fixed at 001b ..................................................... fixed
Offset 17-14 - Pri Control / Status Base Address............RW
Specifies a 4 byte I/O address space of which only the third
byte is active (i.e., 3F6h for the default base address of 3F4h).
31-16 Reserved ..........................................always read 0
15-2 Port Address.......................................default=03F4h
1-0 Fixed at 01b ....................................................... fixed
Offset 1B-18 - Sec Data / Command Base Address ........RW
Specifies an 8 byte I/O address space.
31-16 Reserved ..........................................always read 0
15-3 Port Address ...................................... default=0170h
2-0 Fixed at 001b ..................................................... fixed
Offset 1F-1C - Sec Control / Status Base Address..........RW
Specifies a 4 byte I/O address space of which only the third
byte is active (i.e., 376h for the default base address of 374h).
31-16 Reserved ..........................................always read 0
15-2 Port Address ...................................... default=0374h
1-0 Fixed at 01b ....................................................... fixed
Offset 23-20 - Bus Master Control Regs Base Address..RW
Specifies a 16 byte I/O address space compliant with the SFF-
8038i rev 1.0 specification.
31-16 Reserved ..........................................always read 0
15-4 Port Address .......................................default=CC0h
3-0 Fixed at 0001b ................................................... fixed
See Rx42[7-6] for Native / Compatibility mode select for the
above registers
Offset 2D-2C – Sub Vendor ID (0000h)...........................RO
The readback value may be changed by writing to RxD5-D4.
Offset 2F-2E – Sub Device ID (0000h) .............................RO
The readback value may be changed by writing to RxD7-D6.
Offset 34 - Capability Pointer (C0h) ................................RO
Offset 3C - Interrupt Line (0Eh) ......................................RO
7-4 Reserved ......................................... always read 0
3-0 IDE Interrupt Routing (for native mode)
0000 Disable
0001 IRQ1
0010 IRQ2
… …
1101 IRQ13
1110 IRQ14 ....................................................default
1111 IRQ15
APIC
(See Device 17 Function 0 Rx4D[7])
x000 IRQ16
x001 IRQ17
x010 IRQ18
… …
x111 IRQ23
Offset 3D - Interrupt Pin (00h).........................................RO
7-0 Interrupt Routing Mode
00h Legacy mode interrupt routing ..............default
01h Native mode interrupt routing
Offset 3E - Minimum Grant (00h)....................................RO
Offset 3F - Maximum Latency (00h)................................RO