Power-Up Boot Sequence - AGFA Avantra 36/44 Service Manual

Because the Avantra is a multi-controller system, it provides two levels of tests:
• Level One (core tests) –executed by each micro-controller as it is taken out
of reset by the DIAG. The test purpose is to verify that each micro-controller
and its hardware domain are functional.
• Level Two (micro-controller handshake tests) –provides confidence in
the inter-micro-controller communication bus and its peripherals.
Each micro-controller must be initialized prior to performing its own core and sub-
system tests. At power-up the DIAG micro-controller is configured as the master de-
vice. It takes each micro-controller out of reset, initializes it, and performs basic
confidence checks on the electronics. After all micro-controllers complete their tests,
results are reported back to the DIAG micro-controller. If an error has been detected,
the appropriate error message is reported and/or modem dial-out routine executes.
If the boot is successful, the DIAG micro-controller gives up its mastership role to the
DEC K-4.

3.2.2 Power-up Boot Sequence

The power-up boot sequence starts with a reset to the DIAG micro-controller. At
reset the DIAG micro-controller is programmed as the master of the SPI bus and is
initialized as follows:
Serial Communication: 9600 baud, 8 data bits, 1 stop, no parity
Serial Peripheral Interface (SPI) Communication mode: Master Mode
Operator Control Panel (OCP) held in reset
Digital Engine Controller (DEC-K4) held in reset
DSP held in reset
After the DIAG micro-controller initializes, it looks for a keyboard input (waits 5 sec-
onds). A keyboard input could come from the diagnostic port via a PC connected
directly or through a remote modem connection. If a key is pressed during this time,
the boot sequence and the diagnostics in the monitor mode abort.
If no key is pressed, the boot checks to see if a modem is present by sending an AT
modem command. If there is a modem response (OK), the dial-out feature enables.
If there is no response, the dial-out feature disables.
Section I: Imagesetter
Diagnostics 3-3