Theory of Operation Model GFC7000TA Carbon Dioxide Analyzer
Teledyne Analytical Instruments 199
9.3.2. CPU
The unit’s CPU card, installed on the motherboard inside the rear panel, is a low power (5 VDC, 720mA
max), high performance, Vortex 86SX-based microcomputer running Windows CE. Its operation and
assembly conform to the PC/104 specification.
Figure 9-10: CPU Board
The CPU includes two types of non-volatile data storage: a Disk on Module (DOM) and an embedded
flash chip.
9.3.2.1. Disk-On-Module (DOM)
The DOM is a 44-pin IDE flash chip with storage capacity to 129 MB. It is used to store the operating
system, the Teledyne firmware, and most of the operational data generated by the analyzer’s internal
data acquisition system (DAS - See Section 6.7).
9.3.2.2. Flash Chip
This non-volatile, embedded flash chip includes 2MB of storage for calibration data as well as a backup of
the analyzer configuration. Storing these key data on a separate, less heavily accessed chip significantly
decreases the chance of data corruption. In the unlikely event that the flash chip should fail, the analyzer
will continue to operate with just the DOM. However, all configuration information will be lost, requiring
that the unit be recalibrated.
