Workstation 4 Setup Guide 2-13
What’s Inside?
System Board
The CAL deletes the image from the CF card before it restarts the workstation.
See the Memory Architecture description in Chapter 1 for more information
about CAL.
Boot Loader
The Boot Loader is stored in U24, a 2MB Flash EPROM and is specific to the
x86 compatible Geode SC3200 processor and integrated chip set. When the
WS4 is powered-up, the first lines of code executed are in the boot loader. It
performs hardware initialization of system board integrated circuits at the
register level, then runs a Power On Self Test (POST) of major sub-system
components.
See the Software Configuration section in Chapter 1 for more information
about the Boot Loader.
LVDS Transmitter
U23, the DS90C363 LVDS transmitter converts 21 bits of CMOS/TTL data
from the SC3200 TFT controller into 3 Low Voltage Differential Signalling
(LVDS) data streams. A Phase Lock Loop (PLL) clock is transmitted in
parallel with the data streams over a forth data stream. This device, and the
companion LVDS receiver provide a means to reduce the EMI emissions
normally associated with wide, high speed TTL interfaces to active LCD
panels.
Touchscreen Interface
The WS4 Touchscreen Interface consists of micro controller U37, Touchscreen
Controller U38, and serial EEPROM U40. U37 is an 87C52 micro controller
with firmware supplied by 3M touch systems to manage the Burr-Brown
ADS7845E Touchscreen Controller. The device consists of a 12-bit sampling
analog-to-digital converter (ADC) with a synchronous serial interface to micro
controller U37. Serial EEPROM U40 stores screen calibration and serial
interface data while the system is off.
Complex Programmable Logic Device (CPLD)
This device controls the POS features of the workstation including Cash
Drawers and Backlight brightness. In addition, it manages the Power and Reset
switches, and provides control signals to the on-board power supply regulators
to control the WS4 power management states.
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