YMF754-R datasheet(15/60 Pages) YAMAHA

15 / 60 page

YMF754

June 28, 1999

-15-

14-17h: Legacy Audio I/O Base Address (Dummy for SB, FM, MPU, D-DMA)

Read / Write

Default: 00000001h

Access Bus Width: 8, 16, 32-bit

b15

b14

b13

b12

b11

b10

IOBASE0

I/O

b31

b30

b29

b28

b27

b26

b25

b24

b23

b22

b21

b20

b19

b18

b17

b16

b0................IO

(Read Only)

This bit indicates that the base address is assigned to I/O. This bit is hardwired to “1”.

b[15:6] ........IOBASE0

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.

18-1Bh: Legacy Audio I/O Base Address (Dummy for Joystick)

Read / Write

Default: 00000001h

Access Bus Width: 8, 16, 32-bit

b15

b14

b13

b12

b11

b10

IOBASE1

I/O

b31

b30

b29

b28

b27

b26

b25

b24

b23

b22

b21

b20

b19

b18

b17

b16

b0................IO

(Read Only)

This bit indicates that the base address is assigned to I/O. This bit is hardwired to “1”.

b[15:2] ........IOBASE1

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.

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