YMF740C Datasheet, PDF (17/44 Pages) List of Unclassifed Manufacturers – DS-1L

YMF740C
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
IMOD SBVER
SMOD
-
- MAIM
b7 b6
JSIO
b5 b4
MPUIO
b3 b2
SBIO
b1 b0
FMIO
b[1:0] ..........FMIO: FM I/O Address allocation
These bits determine the base I/O address for the of the FM Synthesizer block (FMBase).
FM Synthesizer block uses 4 bytes in the I/O address space.
“0”:
388h
(default)
“1”:
398h
“2”:
3A0h
“3”:
3A8h
b[3:2] ..........SBIO: SB I/O Address allocation
These bits determine the base I/O address for the Sound Blaster Pro block (SBBase). This block uses 16
bytes in the I/O address space.
“0”:
220h
(default)
“1”:
240h
“2”:
260h
“3”:
280h
b[5:4] ..........MPUIO: MPU I/O Address allocation
These bits determine the base I/O address for the MPU401 block (MPUBase). This block uses 2 bytes
in the I/O address space.
“0”:
330h
(default)
“1”:
300h
“2”:
332h
“3”:
334h
b[7:6] ..........JSIO: Joystick I/O Address allocation
These bits determine the base I/O address for the Joystick block (JSBase). This block uses 1 byte in the
I/O address space.
“0”:
201h
(default)
“1”:
202h
“2”:
204h
“3”:
205h
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.
January 14, 1999
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