Introduction
MOTOROLA
MC68322 USER’S MANUAL
1-3
1.2 PROCESSORS AND MODULES
To improve total system throughput and reduce part count, board size, and cost of system
implementation, the M68300 Family integrates intelligent peripheral modules with typical
glue logic on-chip. The MC68322 consists of two processor units (the EC000 core and RGP)
and six modules that assist them (the PVC, bus interface unit, system integration module,
DRAM system integration module, DMA controller, and parallel port interface). Figure 1-1
illustrates the MC68322 block diagram.
Figure 1-1. MC68322 Block Diagram
1.2.1 The EC000 Core
The MC68322 contains a static, low-power, 16-bit microprocessor (EC000 core), which
performs general-purpose computing, I/O and exception handling, and display list
rendering. The core has a 16-bit data path that is upward compatible with 32-bit machines.
It also has a 32-bit internal architecture with internal 32-bit data and address registers, and
an extended address range. The address range is 28 bits for internal register decoding of
chip-selects and DRAM controller functions. This address range allows for full code
compatibility with existing M68000 Family-based designs and future upward compatibility to
higher performance designs. The core is register and memory-map compatible with the
industry standard MC68000, MC68EC000, and MC68HC000 processors.
The MC68322 is designed to support in-circuit emulation with existing emulators so that new
hardware and software designs being ported to the MC68322 can be tested rapidly. This is
accomplished by providing signals in a 208-pin grid array (PGA) package that are not
available in the 160-pin quad flat pack (QFP) package.
PARALLEL PORT
IEEE 1284
DMA
STATIC
EC000 CORE
CLOCK
PROM
LOCAL
TALK
SERIAL
ETHERNET
SCSI
PERIPHERAL
(OPTIONAL)
SYSTEM
INTEGRATION
MODULE (SIM)
DRAM CONTROL
DRAM
PRINT ENGINE
BUS
INTERFACE UNIT
RISC GRAPHICS
PROCESSOR (RGP)
GRAPHICS UNIT
PRINT ENGINE VIDEO
CONTROLLER (PVC)
DMA
IN-CIRCUIT
EMULATION
(OPTIONAL)
GRAPHICS BUS
EC000 BUS
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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