Yamaha RX-Z1 Service Manual page 36

RX-Z1/DSP-AZ1
14. SUB MC WRITE
This menu is used to make settings when rewriting the
program of the sub microprocessor.
Mode entry: Initial message on display to indicate the
mode to rewrite the program of the sub
microprocessor.
Writing enabled: Causes the rewrite program to be
started.
SUB CPU Reset: Forces the sub microprocessor to
reset.
15. DSP PCB CHECK
This menu is used to self-diagnose the bus connection
condition between the external RAM and DSP, making
use of the CPU-Ext. RAM interface function which
YSS910 has.
The signal processing keeps the state before executing
this menu. When an error has occurred, bit 3 of YSS938 O
port becomes HIGH or the DC control OUT terminal
becomes LOW. (The DC control OUT terminal becomes
HIGH when the connection is OK.)
(RAM CHECK)
#1/#2: Displays the connection condition after checking
the address bus and data bus of YSS910 #1 (IC27
of DSP P.C.B.) and YSS910 #2 (IC41 of DSP
P.C.B.).
"NoEr" appears when no error is detected.
Example: when the data bus check result is NG
1619: Indicates that there was an error between
bits 16 and 19. If there were a multiple number of
errors, the ones on the LSB side are displayed
first.
Example: when the address bus check result is
NG
Ad01: Indicates that there is an error in bit 01.
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14.SUB MC WRITE
Mode entry ->
14.SUB MC WRITE
Writing enabled
14.SUB MC WRITE
SUB CPU Reset
15.DSP PCB CHK
#1:NoEr #2:NoEr