Date : 10/02/98 R7625115
Controller module
R7625115
12
Technical description
TECHNICAL DESCRIPTION " CONTROLLER "
Introduction.
The controller module can be divided into four blocks : the RWI (Real World Interface),
CTRL (Controller), ASIC and PLL.
Each block has a typical function, but, needs information from the other blocks. These
connections are realised by the address / data bus or by "handshake" signals. Address
and data are split by a GAL - ADEC (
A
ddress DECoder).
The schematic diagram consists of 4 sheets : Sheet 1=Controller , Sheet 2=ASIC+PLL,
Sheet 3=RWI and Sheet 4=I/O + Power Supplies.
Real World Interface
The RWI is responsible for the communication with the peripheral circuitry of the
projector, more in particular the PPM (Pulse Position Modulated) commands. These
commands can come in via the IR receiver, coming straight from the attached keypad,
via the PC communication (RS232) port or the RCVDS port.
This electronic part must be supplied from the +9V
SB
supply line, as it must be ready
in stand-by to respond to an ON command. The state of the switching transistor Q23
(on the I/O) is determined by the
"SMPS"
line. This is the output pin 11 of IC28, which
is supplied from the micro-controller IC19. Whether this line is high or low at the
moment the mains is supplied, depends on the DIP switch position "Power ON/OFF"
(S2, switch 4).
The data bus of the RWI micro-controller IC19 is connected with the main controller
IC2 via a bi-directional buffer IC23.
The multiplexed address/data bus P0 of the microcontroller drives the LEDs D30 - D37
and the DIP switches via the buffer IC24 (74HCT573).
Watchdog - 9 Volt Watch
The watchdog is built around IC25 pins 1 - 2 - 3 and Q20 transistor. At switching on the
projector, the +5VSB is supplied to this circuit. As C68 is not charged at switching on,
the output pin 1 is high for a moment in order to reset the microcontroller at pin 10 of
IC19 (RST). Pin 3 of IC25 is set at half the supply voltage. The microcontroller triggers
the watchdog via C67 in order to keep charged the capacitor C68 by conduction of Q20.
If the processor gets blocked for any reason, the level detector output pin 1 comes high
and resets the controller as described before. The watchdog has as task to restart the
controller when it gets blocked for some reason.
When, during an arcing in a CRT the +5V supply is temporarily shorted, the
microprocessor can get in trouble. For that reason, the other level detector in IC25
monitors the 9V (9VWATCH). The output of this detector is connected to the
INT0
of
the processor.
Controller (CTRL)
The Controller is built aroound the chipset 68000=microprocessor, 68230 and
68901. The chip 68230 and 68901 provide the in-/output bit (e.g. PLL-drive, I
2
C
coincidence...), the bus connection with the RWI, the serial communication with
the RCVDS and the interrupt-inputs.
The Gal IC7 is the address decoder; all I/O are memory mapped. At the same time
IC7 provides the DTACK (data acknowledge) of the other components to the 68000.
The Gal IC8 provides for the interrupt management and separates RD and WR from
RD/WR.
The information adjusted by the user regarding the settings of the different blocks
(memory blocks) are stocked in the E²PROM IC6.
The clockgenerator is built around IC1/XT1. The buffered TXDRCV and RXDRCV are
Summary of Contents for GRAPHICS 1209S
Page 4: ...BARCO PROJECTION SYSTEMS GRAPHICS 1209S 90 00972 230V AC 90 00977 120V AC SAFETY NOTICE...
Page 9: ...BARCO PROJECTION SYSTEMS GRAPHICS 1209S 90 00972 230V AC 90 00977 120V AC GENERAL INFORMATION...
Page 28: ...BARCO PROJECTION SYSTEMS GRAPHICS 1209S 90 00972 230V AC 90 00977 120V AC SERVICE SHEETS...
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