YMF740C Datasheet, PDF (16/44 Pages) List of Unclassifed Manufacturers – DS-1L

YMF740C
b[7:6] ..........SDMA: Sound Blaster DMA-8 Channel Select
These bits select the DMA channel for the Sound Blaster Pro block.
“0”:
DMA ch0
“1”:
DMA ch1
(default)
“2”:
reserved
“3”:
DMA ch3
b[10:8] ........SBIRQ: Sound Blaster IRQ Channel Select
These bits select the interrupt channel for the Sound Blaster Pro block.
“0”:
IRQ5 (default)
“1”:
IRQ7
“2”:
IRQ9
“3”:
IRQ10
“4”:
IRQ11
“5” - “7”: reserved.
b[13:11] ......MPUIRQ: MPU401 IRQ Channel Select
When MIEN is set to “1”, these bits select the interrupt channel for the MPU401 block.
“0”:
IRQ5
“1”:
IRQ7
“2”:
IRQ9 (default)
“3”:
IRQ10
“4”:
IRQ11
“5” - “7”: reserved
Same interrupt channels can be assigned to SBIRQ and MPUIRQ.
b14..............Reserved Bit
Hardwire to “0”.
b15..............LAD: Legacy Audio Disable
This bit disables the Legacy Audio block.
“0”: Enables the Legacy Audio block
“1”: Disables the Legacy Audio block
(default)
When this bit is set to “1”, DS-1L 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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