ymf740c ETC-unknow, ymf740c Datasheet - Page 18

• Manufacturer Part Number: ymf740c
• Description: Ds-1l
• Manufacturer: ETC-unknow

YMF740C
44-45h: Subsystem Vendor ID Write Register
46-47h: Subsystem ID Write Register
b[12:11] ......SMOD: SB DMA mode
b[14:13] ......SBVER: SB Version Select
b15..............IMOD: Legacy IRQ mode
b[15:0] ........Subsystem Vendor ID Write Register
b[15:0] ........Subsystem ID Write Register
These bits determine the protocol to achieve the DMAC(8237) function on the PCI bus.
These bits set the version of the SB Pro DSP. The value set in these bits is returned by sending the E1h
DSP command.
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.
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.
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.
b15
b15
“0”:
“1” - “3”:
“0”:
“1”:
“2”:
“3”:
“0”:
“1”:
Read / Write
Default: 1073h
Access Bus Width: 16-bit
Read / Write
Default: 000Ch
Access Bus Width: 16-bit
b14
b14
PC/PCI
reserved
ver 3.01
ver 2.01
ver 1.05
reserved
Legacy interrupt (IRQs)
PCI interrupt (INTA#)
b13
b13
b12
b12
b11
b11
(default)
(default)
b10
b10
Subsystem Vendor ID Write
b9
b9
Subsystem ID Write
(default)
-18-
b8
b8
b7
b7
b6
b6
b5
b5
b4
b4
b3
b3
January 14, 1999
b2
b2
b1
b1
b0
b0