YMF754-V ETC, YMF754-V Datasheet - Page 15
YMF754-V
Manufacturer Part Number
YMF754-V
Description
DS-1E
Manufacturer
ETC
Datasheet
1.YMF754-V.pdf
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YMF754
14-17h: Legacy Audio I/O Base Address (Dummy for SB, FM, MPU, D-DMA)
18-1Bh: Legacy Audio I/O Base Address (Dummy for Joystick)
b0................IO
b[15:6] ........IOBASE0
b0................IO
b[15:2] ........IOBASE1
This bit indicates that the base address is assigned to I/O. This bit is hardwired to “1”.
This register is used so that the OS may secure I/O resources for Sound Blaster Pro, FM Synthesizer,
MPU401 and D-DMA controller. Because this register is a dummy one, each for the I/O addresses of
the above blocks is assigned with the I/O addresses set to 4C-4Dh and 60-65h respectively by the software
driver.
This bit indicates that the base address is assigned to I/O. This bit is hardwired to “1”.
This register is used so that the OS may secure I/O resource for the joystick port. Because this register is
a dummy one, the joystick I/O address is assigned with the I/O address set to 66-67h by the software
driver.
b15
b31
b15
b31
-
-
Read / Write
Default: 00000001h
Access Bus Width: 8, 16, 32-bit
Read / Write
Default: 00000001h
Access Bus Width: 8, 16, 32-bit
b14
b30
b14
b30
-
-
b13
b29
b13
b29
-
-
(Read Only)
(Read Only)
b12
b28
b12
b28
-
-
b11
b27
b11
b27
IOBASE0
-
-
b10
b26
b10
b26
-
-
b25
b25
b9
b9
-
IOBASE1
-
-15-
b24
b24
b8
b8
-
-
b23
b23
b7
b7
-
-
b22
b22
b6
b6
-
-
b21
b21
b5
b5
-
-
-
b20
b20
b4
b4
-
-
-
b19
b19
b3
b3
-
-
-
June 28, 1999
b18
b18
b2
b2
-
-
-
b17
b17
b1
b1
-
-
-
-
b16
b16
I/O
I/O
b0
b0
-
-
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