Sequence When Power Is Turned Up - Yamaha n8 Service Manual

SEQUENCE WHEN POWER IS TURNED UP

1. Outline
This chapter explains major processes necessary for system start-up such as device initialization from turning on the power to standard
condition when all the tasks are started.
Use this chapter as a guide for detecting system malfunctions in case it is impossible to enter the test program.
2. Device to be operated
Device If the device is necessary to enter the test program
SSP1(MAIN)
SSP1(SUB)
FLASH ROM
SRAM
SDRAM
CPLD
I 2 C
E-BUS
MCI
ADC · DAC
HA
MUTE Controller
DICEII (including
peripherals)
If the device with a circle mark ( K ) in the above table does not work normally, it is impossible to enter the test program.
In other words, these devices should be checked if it is impossible to enter the test program.
The next section, "Start-up sequence" explains the controls of these devices.
3. Start-up sequence
This section explains control of each device at each moment after the power is turned on.
If no LED lights on when powered, some of these devices may not be operating normally.
In that case, refer to the following descriptions on sequence indicated in boldface.
"/RESET" signal is controlled through the hardware when the power is turned on and the following devices start up.
SSP1(MAIN), SSP1(SUB), FLASH ROM, CPLD
Check that the "/RESET" signal level of each device is at High (+3.3 V typ.).
"/RESET" signal source: DM-A circuit board (n8)/DM-B circuit board (n12) IC104-1 pin
Reset cancellation factor: Detecting that core voltage of SSP1 (IC107, IC110) is 1.65 V or more.
"/RESET" signal pin of each device:
SSP1(MAIN)
SSP1(SUB)
FLASH ROM
CPLD
The ARM of the SSP1 (MAIN) starts and program is fetched from the FLASH ROM.
Check that levels at each control line (/CS, data bus, address bus, /MWR, /MRD) between the SSP1 (MAIN)
and FLASH ROM are moving.
/CS
Data bus
MMD[0:15]
Address bus
MMA[1:20]
/MWR
/MRD
Initializes peripherals such as SSP1 universal port and serial I/O.
K
—
K
K
—
K
K
K
—
—
—
—
—
(DM-A circuit board (n8)/DM-B circuit board (n12)) IC107-202 pin
(DM-A circuit board (n8)/DM-B circuit board (n12)) IC110-202 pin
(DM-A circuit board (n8)/DM-B circuit board (n12)) IC108-12 pin
(DM-A circuit board (n8)/DM-B circuit board (n12)) IC111-64 pin
SSP1(MAIN)
DM-A circuit board (n8)/DM-B circuit board (n12): IC107
151 pin
105,106,108-113,115-118,120-122,124 pin
125-128,132-137,139-141,143-146,148-150 pin
101 pin
100 pin
! DM-A circuit board (n8)/DM-B circuit board (n12): IC107
! DM-A circuit board (n8)/DM-B circuit board (n12): IC108
! DM-A circuit board (n8)/DM-B circuit board (n12): IC109
! DM-A circuit board (n8)/DM-B circuit board (n12): IC111
! DM-A circuit board (n8)/DM-B circuit board (n12): IC115
PN-A circuit board (n8)/PN-B circuit board (n12): IC100, IC200,
!
PNSB circuit board (n12 only): IC1
FLASH ROM
DM-A circuit board (n8)/DM-B circuit board (n12): IC108
26 pin
29-36,38-45 pin
1-9,16-25,48 pin
11 pin
28 pin
n8/n12
125