YMF754-V ETC, YMF754-V Datasheet - Page 20
YMF754-V
Manufacturer Part Number
YMF754-V
Description
DS-1E
Manufacturer
ETC
Datasheet
1.YMF754-V.pdf
(60 pages)
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YMF754
42-43h: Extended Legacy Audio Control
b15..............LAD: Legacy Audio Disable
b8................MAIM: MPU401 Acknowledge Interrupt Mask
b[12:11] ......SMOD: SB DMA mode
b[14:13] ......SBVER: SB Version Select
b15..............IMOD: Legacy IRQ mode
IMOD
This bit disables the Legacy Audio block.
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.
This bit determine whether interrupt is asserted when the acknowledge, which is occurred by changing
MPU401 mode form default to UART, is returned.
These bits determine the protocol to achieve the DMAC(8237) function on the PCI bus.
These bits set the version of the SB Pro DSP. The value set in these bits is returned by sending the E1h
DSP command.
The legacy interrupt protocol is selected with IMOD and SIEN. Refer to the explanation of SIEN bit.
b15
“0”: Enables the Legacy Audio block
“1”: Disables the Legacy Audio block
“0”: Interrupt is asserted when the acknowledge is returned.
“1”: Interrupt is masked when the acknowledge is returned.
“0”:
“1”:
“2”:
“3”
“0”:
“1”:
“2”:
“3”:
Read / Write
Default: 0000h
Access Bus Width: 8, 16, 32-bit
b14
SBVER
b13
PC/PCI
reserved
Distributed DMA (D-DMA)
reserved
ver 3.01
ver 2.01
ver 1.05
reserved
b12
SMOD
b11
(default)
(default)
b10
-
b9
-
(default)
-20-
MAIM
b8
b7
-
b6
-
(default)
b5
-
b4
-
b3
-
June 28, 1999
b2
-
b1
-
b0
-
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