Chapter 5: Theory Of Operation; Processor, Coprocessor, And Memory; Application Flash Memory Or Rfa; Figure 5-1. Block Diagram - RadiSys EPC - 6A Hardware Reference Manual

Chapter 5
Theory of Operation
This chapter specifies other information about EPC-6A operation useful to the system
designer. The following diagram shows the major elements of the EPC-6A and data paths
among them.
486DX2
8K cache;
Integrated FPU
DØ ... 31
A2 ... 31
Reset/abort switch
Battery
Speaker

Processor, Coprocessor, and Memory

The processor is an Intel 486DX2 in a 168 pin PGA package, with 32-bit architecture. The
Intel 486DX2 processor has an internal 8KB on-chip cache and an integrated floating
point unit.There is one factory-installed 4MB DRAM option.

Application Flash Memory or RFA

A 1MB array of nonvolatile flash memory is provided in the form of an E280085A
component. The flash memory is mapped into its own address space beginning at address
0. This address space is accessible through address and data registers in the I/O space. It
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MDØ ...
R400
RadiSys
MAØ ... 9
highly inte-
grated system
controller
Keyboard
connector

Figure 5-1. Block Diagram

RadiSys data-
path switch
gate array
4 MB
DRAM
VME gate
arrays and
control logic
8-bit local bus
SRAM Flash
memory
5
VMEbus
Slot-1 jumper
LED
display
Serial
port
control
29