Hardware Overview
Theory of Operation
1 - 6
0070-10-0591-01
Trio™ Service Manual
1.2.3
CPU Board (Main Control Board)
P/N 0671-00-0056 or P/N 0671-00-0236
1.2.3.1
Overview
Power Supply Input Voltage: +12 V±5%; +5 V±5%
The main control board uses the Coldfire series embedded microprocessor 5206e
manufactured by Motorola Company. It also adopts 3.3 V low-voltage power supply to
reduce the power consumption. Other main components on the main control board include:
Flash, SRAM, FPGA, network controller, etc., all of which require 3.3 V power. The capacity
of the Flash is 2 MB or 4 MB*, which employs two parallel-connected 512K x 16 or 1M x
16* chips and therefore uses 32-bit character width to support CPU to operate at the highest
possible speed instead of accessing the DRAM for operation. The main control board has
also a 4 MB memory, which is made up of two parallel-connected 1M ×16-bit chips.
Because no executing program is required to be loaded, only one RTC is used. This chip uses
one 225maH dry cell as the spare power supply. In addition, one 2KB E2PROM is used to
store parameters. The main control board supports a resolution of 800 x 600 and provides
three interfaces: a LVDS interface, a 6 bit digital interface, and a VGA interface. The monitor
displays characters and waveforms, in the same color, on the screen. The support system
needs 10 serial ports, and the baud rate (4800/9600/19.2 K/38.4 K/76.8 K) can be
selected by software and interface buffer drives. The main control board adopts the network
controller AX88796 (3.3 V, 10 MHz), which has inside 16 K high-speed buffer SRAM. The
MAX5102 8-bit single-way D/A converter is used to fulfill analog output. The 5 V and 12 V
regulated voltage supplies are introduced from the power board, and therefore 3.3 V and
2.5 V working supplies are respectively generated. Among them, 2.5 V is to be used for the
internal verification of FPGA.
*Applies to P/N 0671-00-0056.
7
12V
C41 positive
electrode
12V output, voltage range is 11.0~13.0V
8
5V
C58 positive
electrode
5V output, voltage range is 4.75~5.25V
9
Feedback
voltage
R37 positive
electrode
There is a DC waveform of about 2.5V between
R37
Key Test Points
NO. NAME
LOCATION
FUNCTION
