ALS300 Datasheet, PDF (23/66 Pages) List of Unclassifed Manufacturers – Media Audio Controller SPEC

Avance Logic Inc.
ALS300
CR18
Read/write
Default 04h
ESP major version number
CR19
Read/write
Default 02h
ESP minor version number
CR1A
CR1A.7-5
CR1A.4-0
Default 0Xh
MPU401 MIDI UART mode control
R/W
R
Bit 7
0
internal midiin from external midiin pad
1
internal midiin from internal midiout
Bit 6
0
internal midiout to external midiout pad
1
external midiin pad to external midiout pad
Bit 5
0
regular midi clock
1
fast midi clock(14.318mhz)
Bit 4
X
reserved
Bit 3
0
MPU401 midi at pass-thru mode
1
MPU401 midi at UART mode
Bit 2
X
reserved
Bit 1
X
reserved
Bit 0
X
reserved
When midi is in pass-thru mode, midi clock is stopped. Internal midiin is tied high and external midiout
is connected to external midiin pad.
In MPU-401 UART mode, the internal midiin input, the external midiout output and the midi clock are
controlled by CR1A.7-5 bits.
In midi loop back mode, when midiin FIFO is full, midi clock will be stop until midiin is not full. This
will aviod midi FIFO overrun.
Special MIDI mode don’t support loop-back function even MIDI is configured as loop-back mode.
CR20
Same as PNP1-30
CR21
Same as PNP2-30
CR3A
MISC control register
Default 20h
Bit 7
Joystick/game-pad select
0
Joystick Mode (Analog Game-Port)
1
Game-Pad Mode (Digital Game-Port)
Bit 6~4
GD0 floating period select
000 300us
23