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Circuit Descriptions, List of Abbreviations, and IC Data Sheets
9.4.4
Control (Diagrams SC7, 8 and 9)
Introduction
As a main controller, the so-called ARTISTIC is used, better
known as OTC (On screen display, Teletext and Control). It is
a 8051 (XA) based controller from Philips Semiconductors, the
SAA5801H.
Although the OTC is the main controller, it acts as a "slave"
when communicating with the Pixel Works IC via the I2C-bus 2.
When the monitor is connected to an F21RE Receiver box, the
UART commands from the Receiver box will control the
monitor.
OTC Processor
7340
TXD
RXD
RS232
VGA2-TXD
VGA2
VGA2-RXD
(FLEX)
UART
RS232
SWITCH
VGA1-TXD
VGA1-RXD
VGA1
VGA1-H
SYNC
VGA1-V
DETECT
RESET
PSU
5V
5V TEST
8V
8V TEST
RC5-IN
RC
RECEIVER
RC-OUT
RC-CNTL
This part describes the Main Control part of the SCAVIO panel
and the interfaces with the software. The control function
consists of the following tasks:
•
Control of external IOs, like fan speed, temperature,
service and RC5,
•
UART communication with Receiver box,
•
RS232 control / communication,
•
Supports the uploading of new SW into the Flash-ROMs,
•
Start-up of monitor and initialisation via I2C,
•
Error detection and storing.
7540
SELECT-1
SELECT-2
IO
EXPANDER
SELECT-3
PCF8574
SELECT-4
POWER
7812
MSP-
DOWN
RESET
AUDIO
I2C-1
(MSP)
7383
RS-232-ACT
SAA5801
UART-ACT
TXD-OTC
RXD-OTC
SYNC-ACT
I2C-1
3V3-STBY
RESET
STANDBY
POWER-OK
5V-TEST
8V-TEST
SERVICE
INPUT
SERVICE_IN
Figure 9-16 Control Part
FM23, FM24, FM33
In stand-alone mode, the monitor can be controlled via the
Remote Control or via the RS232C port.
DDC1/2B (Display Data Channel, an I2C based protocol) is
implemented with separate NVMs for the two VGA inputs and
the DVI-D input as well.
It is also possible to use the RS232C port for software upload
to the PW Scaler and the OTC. The target for downloading is
controlled via a switch in the RS232C path; the switch itself is
controlled by the OTC.
7530
ADC
PDP
CLOCK
GENERATOR
7656
EPLD
OTC
&
&
7510
WP
FLASH ROM
7506
Start-up and Shut-down
The POR signal is not generated on the PSU, but on the
SCAVIO board. This is done with a fully integrated ADM810T
POR chip (item 7517), which senses the 3.3 V coming from the
PSU. The sense level is 3.08 V. During power-up as well as
power-down, this chip will make the RESET signal high. During
power-up, this signal will be held "high" until 240 ms after V_cc
has become stable.
During power-down, the system will be reset as soon as the
V_cc drops below 3.08 V.
9.
TEMP-1
TEMP-2
7430
NVM-WE
NVM
I2C-NVM
OTC
RED-LED
LEDS
GREEN-LED
7605
PW-RESET
PW-START
PW
I2C-2
7500
RAS
CASL
CASH
AC(0:9)
DRAM
DC(0:15)
CL16532099_004.eps
170801
EN 141
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