Mc68302 System Architecture - Motorola MC68302 User Manual

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Flexible Physical Interface Accessible by SCCs Including:
Motorola lnterchip Digital Link (IDL)
General Circuit Interface (GCI also known as IOM@-2)
Pulse Code Modulation (PCM) Highway Interface
Nonmultiplexed Serial Interface (NMSI) Implementing Standard
Modem Signals
SCP for Synchronous Communication
Two Serial Management Controllers (SMCs) To Support IDL and GCI
Auxiliary Channels
1.3 MC68302 SYSTEM ARCHITECTURE
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Most general-purpose microprocessor-based systems use an architecture
that interfaces all peripheral devices directly onto a single microprocessor
bus (see Figure 1-2).
CPU
ROM RAM
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SYSTEM BUS t +
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~ ~ ~
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DMAAND/
CPUllF
ORFIFOS
OMA
ADDITIONAL
DEVICES
SERIAL
TIMERS
CHANNELS
Figure 1-2. General-Purpose Microprocessor System Design
The MC68302 microprocessor architecture is shown in Figure 1-3. In this
architecture, the peripheral devices are isolated from the system bus through
a dual-port memory. Various parameters and counters and all memory buffer
descriptor tables reside in the dual-port RAM. The receive and transmit data
IOM is a trademark of Siemens AG.
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MC68302 USER'S MANUAL MOTOROLA