YMF724F
b[12:11] ......SMOD: SB DMA mode
These bits determine the protocol to achieve the DMAC(8237) function on the PCI bus.
“0”:
“1”:
“2”:
“3”
PC/PCI
(default)
reserved
Distributed DMA
reserved
b[14:13] ......SBVER: SB Version Select
These bits set the version of the SB Pro DSP. The value set in these bits is returned by sending the E1h
DSP command.
“0”:
“1”:
“2”:
“3”:
ver 3.01
ver 2.01
ver 1.05
reserved
(default)
b15..............IMOD: Legacy IRQ mode
DS-1 supports 3 types of interrupt protocols: PCI interrupt (INTA#), Legacy interrupt (IRQs) and
Serialized IRQ. The interrupt protocol is selected with IMOD and SIEN as follows.
SIEN
IMOD
Interrupt protocol
0
0
1
0
1
*
Legacy interrupt (IRQs)
PCI interrupt (INTA#)
Serialized IRQ
(default)
44-45h: Subsystem Vendor ID Write Register
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 Register
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.
January 14, 1999
-20-
YAMAHA [ YAMAHA CORPORATION ]
