AMD-766AC datasheet(39/96 Pages) AMD

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Preliminary Information

23167B – March 2001

AMD-766

TM Peripheral Bus Controller Data Sheet

C0A52: LPC Bus Decode Register 1

Configuration space; function 0; offset: 52h Default: 00h Read-write.

76:4

32:0

SBEN

SBRANGE

SAEN

SARANGE

SARANGE and SBRANGE. Serial port A and B range. Selects the serial port IO ranges routed to the LPC bus.

S[A,B]RANGE Range

000b

3F8 - 3FFh (COM1)

100b

238 - 23Fh

001b

2F8 - 2FFh (COM2)

101b

2E8 - 2EFh (COM4)

010b

220 - 227h

110b

338 - 33Fh

011b

228 - 22Fh

111b

3E8 - 3EFh (COM3)

SAEN and SBEN. Serial ports A and B enable. 1=Serial port IO port accesses specified by the corresponding

RANGE field in this register are routed to the LPC bus (SAEN enables SARANGE and SBEN enables SBRANGE).

0=These accesses are routed to the ISA bus.

C0A53: LPC Bus Decode Register 2

Configuration space; function 0; offset: 53h Default: 00h Read-write.

5:4

321:0

Reserved

MEN

MRANGE

AEN

ARANGE

ARANGE. Audio range. Selects the audio device range routed to the LPC bus as follows:

ARANGE

Range

00b

220 - 233h

01b

240 - 253h

10b

260 - 273h

11b

280 - 293h

AEN. Audio enable. 1=Audio IO port accesses specified by the ARANGE field in this register are routed to the LPC

bus. 0=These accesses are routed to the ISA bus.

AL. Audio legacy enable. 1=Audio legacy IO ports, 388h - 389h, are routed to the LPC bus. 0=These accesses are

routed to the ISA bus.

MRANGE. MIDI range. Selects the MIDI device range routed to the LPC bus as follows:

MRANGE

Range

00b

300 - 301h

01b

310 - 311h

10b

320 - 321h

11b

330 - 331h

MEN. MIDI enable. 1=MIDI IO port accesses specified by the MRANGE field in this register are routed to the LPC

bus. 0=These accesses are routed to the ISA bus.

C0A54: LPC Bus Decode Register 3

Configuration space; function 0; offset: 54h. Default: 00h. Read-write.

7:6

321:0

Reserved

ASIO

SIO

RESERVED MSEN

MSRANGE

MSRANGE. MSS range. Selects the MSS device range routed to the LPC bus as follows:

MSRANGE

Range

00b

530 - 537h

01b

604 - 60Bh

10b

E80 - E87h

11b

F40 - F47h

MSEN. MSS enable. 1=MSS IO port accesses specified by the MSRANGE field in this register are routed to the

LPC bus. 0=These accesses are routed to the ISA bus.

SIO. Super IO configuration. 1=Super IO configuration IO ports, 2Eh - 2Fh, are routed to the LPC bus. 0=These

accesses are routed to the ISA bus.

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