YMF754-R datasheet(21/60 Pages) YAMAHA

21 / 60 page

YMF754

June 28, 1999

-21-

44-45h: Subsystem Vendor ID Write

Read / Write

Default: 1073h

Access Bus Width: 16-bit

b15

b14

b13

b12

b11

b10

Subsystem Vendor ID Write

b[15:0] ........Subsystem Vendor ID Write

This register sets the Subsystem Vendor ID that is read from 2C-2Dh (Subsystem Vendor ID register).

The default value is the YAMAHA Vendor ID, 1073h.

IHVs must change this ID to their Vendor ID in

the BIOS POST routine.

In case EEPROM connects externally, this register is invalid, and do not reflect to Subsystem Vendor ID.

46-47h: Subsystem ID Write

Read / Write

Default: 0012h

Access Bus Width: 16-bit

b15

b14

b13

b12

b11

b10

Subsystem ID Write

b[15:0] ........Subsystem ID Write

This register sets the Subsystem ID that is read from 2E-2Fh (Subsystem ID register).

The default value is the DS-1E Device ID, 0012h.

IHVs must change this ID to their ID in the BIOS

POST routine.

In case EEPROM connects externally, this register is invalid, and do not reflect to Subsystem ID.

48-49h: DS-1E Control

Read / Write

Default: 0001h

Access Bus Width: 8, 16, 32-bit

b15

b14

b13

b12

b11

b10

ACLS WRST

CRST

b0................CRST: AC’97 Software Reset Signal Control

This bit controls the CRST# signal.

“0”: Inactive (CRST#=High)

“1”: Active (CRST#=Low)

(default)

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