Intermec CV30 - Page 67

Chapter 3 — Theory of Operation
CV30 Fixed Mount Computer Service Manual 59
The Reset Path on the CV30
• Cold reset. The PIC controller has an internal circuit that resets itself
upon initial cold power up or if the controller’s supply voltage browns
out or dips below 2.0 VDC. Once the controller goes through a reset
and initialization, it in turn forces the main processor (PXA270) to cold
reset through nCPU_RESET and initializes the rest of the unit. The
user also has a cold reset button at the top of the Console unit that
forces the controller to reset the main processor.
• Clean boot. In certain situations, the system needs to be completely
reinitialized to the factory default settings. To perform a clean boot,
press and hold the cold reset button while pressing the I/O button.
During initialization, a dialog box appears to query if the user wants to
clean boot. If the Volume Up button is pressed, the system will be
restored to its factory settings and all other programs installed by user
will be removed.
Status LED Control
The status lights on the CV30 turn on to indicate the status of the network
connection, a successful decode of a bar code, or a user-defined function.
The status indicators are comprised of green, amber, and blue LEDs. The
blue LED is controlled by the PIC, while the main processor controls the
green and amber LEDs. The following paragraphs describe the meaning of
each LED.
• Green LED ( Good Read). This light comes on when the CV30
successfully decodes a bar code with an attached scanner.
MEM
I
2
C
USB
Client
LCD +
Frame
Buffe
r
AC97
Clock
JTAG
Power
Mana
g
e
r
RTC
Always On
13 MHz
SSP
BB
Infc
Bulverde
Intel® XScale™
core 520 MHz
CF
INT
USB
Host
UART
UART
Cam
Infc
SSP
USIM
SDIO
UART
nRESE
T
RESET
nCPU_RESE
T
PIC
_
PGM
_
EN
nRESET_S
W
nJTAG
_
RESE
T