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MOTOROLA
MC68322 USER’S MANUAL
1-1
SECTION 1
INTRODUCTION
The MC68322 is a high-performance integrated printer processor that combines an
MC68000 compatible EC000 core processor, a RISC graphics processor (RGP), a print
engine video controller (PVC), and numerous system integration features on a single
integrated circuit. It is the first of Motorola’s M68000 Family designed specifically for
nonimpact printers. The MC68322 provides a unique solution for new designs as well as an
excellent migration path for existing M68000-powered printers. Additionally, the new chip
finds ready application to the inkjet printer and multifunction-peripheral (fax/modem/printer)
markets and other embedded control applications, which require very fast bit manipulations.
The dual processor and dual bus architecture gives the MC68322 the ability to deliver
excellent performance. Historically, printer applications have been solved using a single
general-purpose processor with external application specific circuitry. The MC68322
employs a highly specialized, multiprocessor architecture that enables the user to take
advantage of memory reduction techniques. This design implementation provides a
technically superior and more cost effective system solution.
The specialized display list banding techniques (executed by the RGP) enable system
memory requirements to be significantly reduced. The use of software memory reduction
techniques alone (an approach taken by conventional controllers) lack the power needed to
handle complex pages, causing the controller to fall back to lower resolution or reduced
page throughput. The MC68322 optimizes overall system performance by integrating an
EC000 core, RGP, and PVC using a unique dual bus architecture. This architecture
eliminates bus contention between processing units and modules creating a true parallel
processing environment. The additional bandwidth allows each processing unit to operate
at peak performance. Working in conjunction with an on-chip, programmable, bursting
DRAM controller, the processing units are capable of achieving outstanding throughput.
These dedicated processing units enable the MC68322 to produce 600 dpi images using
substantially less memory than conventional controllers. The MC68322 extends these
benefits to low-cost 4-8 ppm printers.
The MC68322 significantly reduces component count, board space, power consumption
and their inherent costs while yielding higher reliability and shorter design time. It also
provides support for toner conservation, thus enabling the print controller to conserve toner
when printing in draft mode. The MC68322 also provides the perfect printing environment
for users of complex page description languages (such as PCL and PostScript) and less
scaleable graphics imaging models such as Windows Printing System and QuickDraw).
Complete code compatibility with the M68000 Family gives the designer access to a broad
base of established real-time kernels, operating systems, languages, applications, and
development tools, many of which are optimized for embedded processing and printing
applications.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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