YMF724 ETC, YMF724 Datasheet - Page 18

• Manufacturer Part Number: YMF724
• Description: high performance audio controller for the PCI Bus
• Manufacturer: ETC

YMF724F
b[7:6] ..........SDMA: Sound Blaster DMA-8 Channel Select
b[10:8] ........SBIRQ: Sound Blaster IRQ Channel Select
b[13:11] ......MPUIRQ: MPU401 IRQ Channel Select
b14..............SIEN: Serialized IRQ enable
b15..............LAD: Legacy Audio Disable
These bits select the DMA channel for the Sound Blaster Pro block.
These bits select the interrupt channel for the Sound Blaster Pro block.
When MIEN is set to “1”, these bits select the interrupt channel for the MPU401 block.
Same interrupt channels can be assigned to SBIRQ and MPUIRQ.
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.
The interrupt channels for IRQs and Serialized IRQ are determined by SBIRQ and MPUIRQ,. Only one
protocol can be used at once.
This bit disables the Legacy Audio block.
When this bit is set to “1”, DS-1 does not respond to the I/O Target transaction for legacy I/O address on
the PCI bus.
“0”:
“1”:
“2”:
“3”:
“0”:
“1”:
“2”:
“3”:
“4”:
“5” - “7”:
“0”:
“1”:
“2”:
“3”:
“4”:
“5” - “7”:
“0”: Enables the Legacy Audio block
“1”: Disables the Legacy Audio block
SIEN
0
0
1
DMA ch0
DMA ch1
reserved
DMA ch3
IRQ5
IRQ7
IRQ9
IRQ10
IRQ11
reserved.
IRQ5
IRQ7
IRQ9
IRQ10
IRQ11
reserved
IMOD
1
0
*
(default)
(default)
Interrupt protocol
Legacy interrupt (IRQs)
PCI interrupt (INTA#)
Serialized IRQ
(default)
(default)
-18-
(default)
January 14, 1999