D20/D200 Main Processor Specifications - GE D20 Technical Overview

GE Grid Solutions
The D20ME consists of five distinct interacting circuit blocks, as shown in Figure 19.
• CPU/Control performs data processing, device addressing and system control. The D20ME
uses an MC68030 32-bit microprocessor, which is capable of addressing up to four
megabytes of on-board memory or four gigabytes when used in conjunction with external
memory accessible via the VME bus interface. Also included in this block are address
decoding, clock and control signal generation, asynchronous control, power
monitor/watchdog timer/reset, status output port and diagnostic/debug facilities.
• Memory consists of memory components and circuits. The D20ME uses boot EPROM and
three banks of four sets of memory devices (static RAM, non-volatile RAM, and flash)
providing up to 1.5 MB, 0.5 MB, and 2 MB respectively of on-board memory.
• Interrupt Control consists of an interrupt handler designed specifically for the VME bus. It
operates in conjunction with a VME bus controller, and determines the importance of, and
controls, interrupts from the serial ports, the D.20 Link HDLC chip, and the real-time clock.
• Serial I/O is the communications center of the D20ME. It consists of two D.20 HDLC
communications ports, one RS-232 9600 baud maintenance port and seven byte-oriented
asynchronous RS-232 communication ports. The seven serial ports, all of which are
programmable, are used for communication with SCADA/EMS master stations and/or other
serial devices, such as printers and IEDs. The HDLC port handles a bit-oriented D.20
protocol structure for communicating with the D20 I/O peripheral.
• VME Bus Interface. The D20ME operates as the VME bus master to allow it to interface to,
control and arbitrate the VME bus.

2.2.2 D20/D200 Main Processor Specifications

Item
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CPU/Memory
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•
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Self Diagnostics
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•
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GE Information
Table 4 D20/D200 Main Processor Specifications
32-bit Freescale 68030 microprocessor
40 MHz MPU clock
Real-time clock, 1.0 ms resolution accurate to ±2.0 ppm
On-board memory
−
2 MB Flash memory
−
2 MB SRAM (incl. 512 K battery back up)
−
512 KB BootROM
Program memory checksums
RAM test
Configuration verification
Interrupt controller verification
Serial port test
Watchdog and power monitor
Peripheral communication checks
Error logger
D20/D200 Technical Overview
Description
PRPI-019-3.00-10
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