YMF740C Datasheet, PDF (18/44 Pages) List of Unclassifed Manufacturers – DS-1L

YMF740C
b[12:11] ......SMOD: SB DMA mode
These bits determine the protocol to achieve the DMAC(8237) function on the PCI bus.
“0”:
PC/PCI
(default)
“1” - “3”: 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”:
ver 3.01
(default)
“1”:
ver 2.01
“2”:
ver 1.05
“3”:
reserved
b15..............IMOD: Legacy IRQ mode
DS-1L supports 2 types of interrupt protocols: PCI interrupt (INTA#) and Legacy interrupt (IRQs). The
interrupt protocol is selected by IMOD as follows. The interrupt channels for IRQs are determined by
SBIRQ and MPUIRQ. Only one protocol can be used at once.
“0”:
Legacy interrupt (IRQs)
(default)
“1”:
PCI interrupt (INTA#)
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.
46-47h: Subsystem ID Write Register
Read / Write
Default: 000Ch
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 Register
This register sets the Subsystem ID that is read from 2E-2Fh (Subsystem ID register).
The default value is the DS-1L Device ID, 000Ch. IHVs must change this ID to their ID in the BIOS
POST routine.
January 14, 1999
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