参数资料
型号: YMF754
厂商: Yamaha Corporation
英文描述: DS-1E
中文描述: 副秘书长至1E
文件页数: 11/60页
文件大小: 305K
代理商: YMF754
YMF754
June 28, 1999
-19-
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..............SIEN: Serialized IRQ enable
DS-1E 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
Legacy interrupt (IRQs)
(default)
0
1
PCI interrupt (INTA#)
1
0
Serialized IRQ
1
reserved
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