YDP-161/YDP-161C
55
SYSTEM BOOTING FLOWCHART
Power ON
Installation mode?
No
Yes
No
Yes
Test Program?
No
Yes
Main
routine
EICN = L (DM: IC100,D12)
TxD0 = H (DM: IC100,B7)
(TxD1 = H (DM: IC100,B6))
Port initial setting
/SPOFF=H(DM: IC153,2)
/MUTE=H(DM: IC153,4)
/DAC-IC=H(DM: IC153,6)
/MIDI-IC=H(DM: IC153,8)
(/SWP-IC=L(DM: IC153,11))
Port initial setting
/DAC-IC=L(DM: IC153,6)
/MIDI-IC=L(DM: IC153,8)
/MUTE=L(DM: IC153,4)
/SPOFF=L(DM: IC153,2)
Transmit Main Program
and Voice Parameter
to SDRAM
Cancel peripheral reset
/DAC-IC=H(DM: IC153,6)
/MIDI-IC=H(DM: IC153,8)
BACK-UP FLASH
(DM: IC103)
Initialization
Starts accessing to
DM: IC103.
Starts accessing to
DM: IC400.
IC102
FLASH ROM?
In case of P2ROM
No
Yes
Test Program
Main routine
No
Yes
No
Yes
REC flashes
Not to be used.
Cancel peripheral reset
/SWP-IC = H
SWP51L(DM: IC400)
Initialization
Initialize BOOT SDRAM
0 clear, Setup of Constant
Set CPU, SWX Port
Register
Starts accessing to
DM: IC102.
Starts accessing to
DM: IC101.
Initialize EBUS driver
(EBUS Start)
EICN=H(DM: IC100,D12)
If the booting procedure stops here, there
is a possibility that the following parts are
damaged:
• PROGRAM [P2ROM] (DM: IC102)
• SDRAM (DM: IC101)
Produce sine wave sound
REC/PLAY flashes
If this indication appears
every time, the following part
is damaged:
• DATA FLASH ROM
(DM: IC103)
If this indication appears
every time, the following part
is damaged:
• DATA FLASH ROM
(DM: IC103)
If this indication appears
every time, the following part
is damaged:
• DATA FLASH ROM
(DM: IC103)
Song Clear is
started?
Backup Clear is
started?
After executing
Factory Set?
REC/PLAY flashes
REC/PLAY flashes
About three seconds after turning on power
Depending on whether
headphones are inserted or not.
Release Mute
/MUTE = L
Release
SP OFF
“Factory Set” refers to the condition of turning on the power after executing “Factory Set” in the Test Program.
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