System Booting Flowchart - Yamaha TYROS4 Service Manual

SYSTEM BOOTING FLOWCHART

CPU registers setting
Port initialization
/PRG-WP = L (IC16 16pin)
/BACKUP-WP = L (IC23 16pin)
/MUTE = L (IC959 5pin)
/SPOFF = L (IC959 3pin)
NTSC/PAL = L (IC606 7pin)
BRT = L (CN302 1pin)
Initialize Enhancing port
/LAN-RES = L (IC14 16pin)
/DAC-IC = L (IC14 15pin)
/MIDI-IC = L (IC14 12pin)
/USB-RES = L (IC14 9pin)
/SWP-IC = L (IC14 5pin)
/AVDP-RES = L (IC14 2pin)
Initialize BOOT SDRAM
0 clear,
Setup of Constant
/SWP-RES = H
Send a message to
SWP51L (IC700, 701)
E-BUS driver
initialization
Is Main Program
defective?
Installation
failure, etc.
Installation mode?
If there is the updater,
the system will shift
to installation mode.
When there is no
media containing
the updater.
* "After executing Factory Set" refers to the condition when the power is turned
on after executing "Factory Set" in the Test Program.
Opening screen
Peripheral Reset
(It takes about several
hundreds milliseconds.)
Transmit Main Program
Release peripheral reset
Installation
Installer program
not found!
Installation
SSP1 soft reset
If the booting procedure does not
IC902
reach to this stage, the following
parts might be defective:
• CPU (IC1)
• SWP51L (IC701)
will appear
Backlight ON
Screen will brighten
BRT = H
/LAN-RES = L
/DAC-IC = L Since set the "L" other than
/MIDI-IC = L
SWP-IC, it can not recognize the
/USB-RES = L
SWP-IC decay.
/SWP-IC = L
/AVDP-RES = L
Initialize SDRAM
Send to SDRAM
(IC201/202/203/204)
to SDRAM
/LAN-RES = H
/DAC-IC = H
/MIDI-IC = H
/USB-RES = H
/SWP-IC = H
/AVDP-RES = H
If the booting procedure does not
reach to this stage, the following
parts might be defective:
• SDRAM
MAC Address
Writing Mode?
MAC Address
written?
END
Test Program?
After executing
Factory Set (*)
Tyros4
A
Instrument ID
writing mode
Failure in writing at
the time of production
Test mode
111