EFLOW EF-Series - Product Electronics; Main Electronics Board Overview; Microprocessor and Memory

Using the EF-Series Unit
2-8 Rev 2/01
2.4 PRODUCT ELECTRONICS
This section describes the EF-Series Main Electronics Board. For Communications Cards, see Section
3. For the Flow Sensor, see Section 4.
2.4.1 Main Electronics Board Overview
The Main Electronics Board components support the functionality of the EF-Series unit. Refer to
Figure 2-1. The board provides:
♦ 32-bit microprocessor
♦ Built-in static RAM
♦ Flash ROM
♦ Liquid Crystal Display (LCD) display
♦ Communications card host port
♦ Operator interface port
♦ Built-in Discrete Output (DO)
♦ RTD input
♦ Diagnostic monitoring
♦ Real-time clock and backup power
♦ Automatic self tests
♦ Power regulation modes
2.4.2 Microprocessor and Memory
The EF-Series unit derives processing power from a 32-bit microprocessor. The 32-bit CMOS micro-
processor features dual 32-bit internal data buses and a single 8-bit external data bus. The unit can
address up to four megabytes of memory including high-speed direct memory access.
The Main Electronics Board has 512 Kbytes of static random access memory (SRAM) for storing
interrupt vectors, alarms, events, and history data.
The Main Electronics Board also has a 512 Kbyte flash memory chip for storing the operating system
factory code and configuration parameters. Two of the 64 Kbyte blocks are reserved for internal
usage.