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SECTION 1
GENERAL DESCRIPTION
The MC68302 integrated multiprotocol processor (IMP) is a very large-scale
integration (VLSI) device incorporating the main building blocks needed for
the design of a wide variety of controllers used in the communications in-
dustry. The IMP is the first device to offer the benefits of a closely coupled,
industry-standard M68000 microprocessor core and a flexible communica-
tions architecture. The IMP may be configured to support a number of popular
industry interfaces, including those for the Integrated Services Digital Net-
work (ISDN) basic rate and terminal adaptor applications. Concurrent oper-
ation of different protocols is easily achieved through a combination of
architectural and programmable features. Data concentrators, line cards,
bridges, and gateways are examples of suitable applications for this device.
The IMP is a high-density complementary metal-oxide semiconductor
(HCMOS) device consisting of an M68000 microprocessor core, a system
integration block (SIB), and a communications processor (CP).
1.1 BLOCK DIAGRAM
The block diagram is shown in Figure 1-1.
By integrating the microprocessor core with the serial ports (in the CP) and
the system peripherals (in the SIB), the IMP is capable of handling complex
tasks such as all ISDN basic rate (2B
+
D) access tasks. For example, the IMP
e111,;i1il~dure
e1nu
1i1e seria1
communrcauons controller \SCCJ ports can support
the interface of an
SIT transceiver chip and the lower part (bit handling) ISO/
OSI layer-2 functions. Other layer-2 functions and the higher protocol layers
would then be implemented by software executed by the M68000 core.
Using the flexible memory-based buffer structure of the IMP, terminal adaptor
applications also can be supported by transforming and sharing data buffer
information between the three
sec
ports and the serial communications port
(SCP). Each SCC channel is available for HDLC/SDLCUE
1 ,
UART, BISYNC,
DDCMP@, V.110, or transparent operation. The IMP provides a number of
choices for various rate adaption techniques and can be used for functions
such as a terminal controller, multiplexer, or concentrator.
SDLC is a trademark of International Business Machines.
DDCMP is a trademark of Digital Equipment Corporation.
MOTOROLA
MC68302 USER'S MANUAL
1-1
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