■
SYSTEM BOOTING FLOWCHART
Starts accessing to IC107.
Test Mode
Changes contrast
Changes contrast
If not, IC101 may be
defective.
Starts accessing to
IC105, 106.
Starts communication
with EBUS.
Stops communication
with EBUS.
No main program installed
by user.
Starts USB-Func
(StreamContrl)
Starts IC (IC304) operation
If opening screen display
does not start, IC105 a
ｎ
d
106 may be defective.
If not, IC101 may be
defective.
CPU and
each registers setting
Program transfer
ROM
→
SDRAM
Backup ROM transfer
ROM
→
SDRAM
Start scanning to key
and switch
EICN=L (IC101, C12)
/USBC-RES cancel
/USBC-RES=H (IC304, 9)
EBUS driver intialization
(EBUS Start)
EICN=H (IC101, C12)
Contrast sertting
LCDCONT_A-C=“011”
LCD_CONT=3 (IC205, 9, 10, 11)
Port initial setting
DAC-IC=L (IC310, 5)
/MIDI-E=L (IC101, D13)
Contrast setting
LCDCONT_A-C=“011”
LCD_CONT=3 (IC205, 9, 10, 11)
EBUS driver initialization
(EBUS Start)
EICN=H (IC101, C12)
BOOT SDRAM initialization
0 clear, Setup of constant
SWX port initialization
DAC-IC=H (IC310, 5)
/USBC-RES=L (IC304, 9)
/Update=H (IC304, 31)
/STBY=H (IC101, V2)
/MUTE=L (IC101, T4)
/MIDI-OE=H (IC101, D13)
LCDCONT_A-C=“111”
LCD_CONT=7 (IC205, 9–11)
DAC setting
/DACCS=L (IC310, 6)
CCLK (IC310, 7)
CDTI (IC310, 8)
SP MUTE cancel
MUTE=H (IC101, T3)
DAC-MUTE cancel
/DACCS=L (IC310, 6)
CCLK (IC310, 7)
CDTI (IC310, 8)
END
Power On
Installation mode ?
YES
NO
Test Mode ?
YES
NO
Installation screen
display
END
Test mode
display
“YAMAHA MX”
“MUSIC SYNTHESIZER”
“YAMAHA MX”
“(c) Yamaha Corp.”
Top screen
Main routine
56
MX61/MX49
