YMF754 Datasheet, PDF (21/60 Pages) YAMAHA CORPORATION – DS-1E

YMF754
44-45h: Subsystem Vendor ID Write
Read / Write
Default: 1073h
Access Bus Width: 16-bit
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
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 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
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 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
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- 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)
June 28, 1999
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