Instruction manual

CMX Controller Board Handshake Sequences
101
• Check for Pedestal — Boot code uses the control panel to determine if
the printer is a pedestal or floor cabinet model. Boot code needs to know
the difference so the exhaust fan fault can be disabled on a pedestal
model. “FAN DISABLED” is printed out at the debug serial port of a
pedestal model.
• Check for Download Mode — Boot code checks whether the ON LINE
and PAPER ADVANCE keys were pressed at power up. If so, the printer
enters download mode. If not, the printer continues the boot routines.
• Check for Diagnostics Mode — Boot code checks whether the
; (PREV) and > (DOWN) keys were pressed at power-up. If so, the
printer enters the Boot Diagnostics menu. If not, the printer continues the
boot routines.
• Check for Remote Download Mode — Boot code checks if the user
remotely requested the printer to enter download mode. If so, the printer
enters download mode. If not, the printer continues boot routines.
• Check for Flash Optimize — Boot code checks if the user requested the
flash file system to be optimized at power up. If so, flash memory is
optimized at this time. If not, the printer continues boot routines.
• Check EC Program — The EC calculates a checksum of the program
stored in its flash memory. If there is problem with its program, the EC
puts the message “nopg” in the ECDC communications register. If the
boot code detects this message, it displays “ERROR: EC PROGRAM
NOT VALID” on the LCD. If the EC processor does not respond within
three seconds, the boot code sends “EC STOPPED AT STATE XXXX” to
the LCD, where XXXX is one of these states:
• Check Security PAL and NVRAM — The chip select for NVRAM comes
from the security PAL. If the PAL is not installed, NVRAM cannot be
accessed, so the PAL is tested before NVRAM. If the security PAL is not
State Description
0000 Power up
0001 Enter checksum calculation
0002 Enter copy download code from FLASH into shared DRAM
0003 Enter programming FLASH mode
0004 Erase EC FLASH
0005 Program FLASH
0006 Finish programming FLASH
0007 Enter initialization of EC serial debug
0008 Enter EC firmware task initializations
0009 Enter power up coil diagnostic
000A Start running normal EC firmware