Motorola Tarpon V. 120C, Service Manual, Page: 32 / 81

V.120c
© 2001 Motorola, Inc. 32
Tarpon Turn on Sequence
1.Power is applied to the accessory connector or the ON/OFF line is pulsed low if the battery is
attached
2.CCAP_2.75 turns on and the 32kHz clock starts
3.CCAP_INT goes high
4.LOGIC_2.75, LOGIC_1.8, DIGITAL_1.8 , and the 16.8 MHz oscillator starts
5.RX_2.75 / AUDIO_2.75 and MEMORY_ Vcc turn on
6.CCAP allows RESETb to go high
7.WALLY starts running
8.The EIM is set up
9.WALLY checks for valid boot code, if not found then radio goes into RAM Loader procedure
10.Verify valid main code, if not found then radio goes into RAM Loader procedure
11.Check to see of
OPT1 and OPT2 are shorted, if they are then radio goes into RAM Loader
procedure
12.WALLY sets up WATCHDOG (WD line goes high if all ok)
13.If WATCHDOG doesn’t go high 50ms after RESETb then the CCAP shuts down radio
14.Boot and main code are downloaded into RAM and WALLY starts running from RAM
15.CCAP is setup for CDMA
16.System PLL are set up
17.WALLY determines what caused the radio to turn on
• EXT_B+ , ON/OFF pulse, or Power Key
1.WALLY checks for any accessories
2.Starts the MMI
3.Sounds wake up tone
4.Looks for cell site
• POWERCUT
1.Get the stored info out of RAM
2.Do a silent reboot
• ALARM – take appropriate action
•No cause found – shut down
Troubleshooting