System Booting Flowchart - Yamaha MX61 Service Manual

MX61/MX49
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SYSTEM BOOTING FLOWCHART

Power On
CPU and
each registers setting
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)
Program transfer
ROM → SDRAM
EBUS driver intialization
(EBUS Start)
EICN=H (IC101, C12)
Start scanning to key
and switch
EICN=L (IC101, C12)
/USBC-RES cancel
/USBC-RES=H (IC304, 9)
Installation mode ?
YES
Installation screen
display
END
56
Starts accessing to IC107.
If not, IC101 may be
defective.
Starts accessing to
IC105, 106.
If not, IC101 may be
defective.
Starts communication
with EBUS.
Stops communication
with EBUS.
Starts USB-Func
(StreamContrl)
Starts IC (IC304) operation
NO
No main program installed
by user.
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)
DAC setting
/DACCS=L (IC310, 6)
CCLK (IC310, 7)
CDTI (IC310, 8)
EBUS driver initialization
(EBUS Start)
EICN=H (IC101, C12)
Backup ROM transfer
ROM → SDRAM
Test Mode ?
YES
Test Mode
Test mode
display
END
If opening screen display
does not start, IC105 aｎd
106 may be defective.
Changes contrast
Changes contrast
NO
Contrast sertting
LCDCONT_A-C="011"
LCD_CONT=3 (IC205, 9, 10, 11)
"YAMAHA MX"
"MUSIC SYNTHESIZER"
"YAMAHA MX"
"(c) Yamaha Corp."
SP MUTE cancel
MUTE=H (IC101, T3)
DAC-MUTE cancel
/DACCS=L (IC310, 6)
CCLK (IC310, 7)
CDTI (IC310, 8)
Top screen
Main routine