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M5251C3 Evaluation Board Users Guide, Rev. 0
Freescale Semiconductor 1-1
Chapter 1
M5251C3 Evaluation Board
The 5251 is a versatile single-board computer based on the MCF5251 ColdFire® Processor. It may be used
as a powerful microprocessor based controller in a variety of applications. It serves as a complete
microcomputer system for reference design, development/evaluation, training, and educational use. The
user need only connect an RS-232 compatible terminal (or a personal computer with terminal emulation
software) and a power supply to have a fully functional system.
CAUTION
This board generates, uses, and can radiate radio frequency energy and, if
not installed properly, may cause interference to radio communications.
Operation of this product in a residential area is likely to cause interference,
in which case, the user, at his/her own expense, will be required to correct
the interference.
This device complies with part 15 of the FCC Rules. Operation is subject to
the following two conditions: (1) This device may not cause harmful
interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
1.1 General Hardware Description
The M5251C3 board provides SDRAM, Flash ROM, and RS-232 in addition to the built-in I/O functions
of the MCF5251 device for programming and evaluating the attributes of the microprocessor. In addition,
there is an IDE and ATA interface for connection to things like an external HDD. There is also an SD card
interface, CAN interface, and both analog and digital audio I/O connections. The board is driven by the
MCF5251 device, which is a member of the ColdFire® family of processors. It is a 32-bit processor with
a 24-bit address bus and 16 lines of data. The processor has eight 32-bit data registers, eight 32-bit address
registers, a 32-bit program counter, and a 16-bit status register.
The MCF5251 processor has a System Integration Module referred to as the SIM. This module
incorporates many of the functions needed for system design. These include programmable chip-select
logic, system protection logic, general purpose I/O and interrupt controller logic. The chip-select logic can
select up to five memory banks and peripherals in addition to one bank of DRAM. The chip-select logic
also allows the insertion of a programmable number of wait states to allow slower memory or
memory-mapped peripherals to be used. (Refer to M5251C3 Evaluation Board by Freescale for detailed
information about the chip selects.) One of the chip selects (CS0) is used to access the on-board Flash
ROM; the other chip selects are user-programmable. The DRAM controller is used to control one SDRAM
device providing 8 MB of SDRAM memory configured as 4 MB x 16 words. All other functions of the
SIM are available to the user.
Figure 1-1 shows the M5251C3 block diagram.