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: 13/60页
文件大小: 305K
代理商: YMF754
YMF754
June 28, 1999
-20-
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-1E does not respond to the I/O Target transaction for legacy I/O address on
the PCI bus.
42-43h: Extended Legacy Audio Control
Read / Write
Default: 0000h
Access Bus Width: 8, 16, 32-bit
b15
b14
b13
b12
b11
b10
b9
b8
b7
b6
b5
b4
b3
b2
b1
b0
IMOD
SBVER
SMOD
-
MAIM
-
b8................MAIM: MPU401 Acknowledge Interrupt Mask
This bit determine whether interrupt is asserted when the acknowledge, which is occurred by changing
MPU401 mode form default to UART, is returned.
“0”: Interrupt is asserted when the acknowledge is returned.
(default)
“1”: Interrupt is masked when the acknowledge is returned.
b[12:11] ......SMOD: SB DMA mode
These bits determine the protocol to achieve the DMAC(8237) function on the PCI bus.
“0”:
PC/PCI
(default)
“1”:
reserved
“2”:
Distributed DMA (D-DMA)
“3”
reserved
b[14:13] ......SBVER: SB Version Select
These bits set the version of the SB Pro DSP.
The value set in these bits is returned by sending the E1h
DSP command.
“0”:
ver 3.01
(default)
“1”:
ver 2.01
“2”:
ver 1.05
“3”:
reserved
b15..............IMOD: Legacy IRQ mode
The legacy interrupt protocol is selected with IMOD and SIEN.
Refer to the explanation of SIEN bit.
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