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YMF724F Datasheet, PDF (18/50 Pages) YAMAHA CORPORATION – high performance audio controller for the PCI Bus | |||
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YMF724F
b[7:6] ..........SDMA: Sound Blaster DMA-8 Channel Select
These bits select the DMA channel for the Sound Blaster Pro block.
â0â:
DMA ch0
â1â:
DMA ch1
(default)
â2â:
reserved
â3â:
DMA ch3
b[10:8] ........SBIRQ: Sound Blaster IRQ Channel Select
These bits select the interrupt channel for the Sound Blaster Pro block.
â0â:
IRQ5 (default)
â1â:
IRQ7
â2â:
IRQ9
â3â:
IRQ10
â4â:
IRQ11
â5â - â7â: reserved.
b[13:11] ......MPUIRQ: MPU401 IRQ Channel Select
When MIEN is set to â1â, these bits select the interrupt channel for the MPU401 block.
â0â:
IRQ5
â1â:
IRQ7
â2â:
IRQ9 (default)
â3â:
IRQ10
â4â:
IRQ11
â5â - â7â: reserved
Same interrupt channels can be assigned to SBIRQ and MPUIRQ.
b14..............SIEN: Serialized IRQ enable
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.
SIEN IMOD Interrupt protocol
0
0
Legacy interrupt (IRQs)
(default)
0
1
PCI interrupt (INTA#)
1
*
Serialized IRQ
b15..............LAD: Legacy Audio Disable
This bit disables the Legacy Audio block.
â0â: Enables the Legacy Audio block
â1â: Disables the Legacy Audio block
(default)
When this bit is set to â1â, DS-1 does not respond to the I/O Target transaction for legacy I/O address on
the PCI bus.
January 14, 1999
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