Introduction
MPC5644A Microcontroller Reference Manual, Rev. 6
Freescale Semiconductor
39
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Interface to the flash array controller pipelined with a depth of one, allowing overlapped accesses
to proceed in parallel for interleaved or pipelined flash array designs
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Configurable access timing usable in a wide range of system frequencies
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Multiple-mapping support and mapping-based block access timing (0-31 additional cycles) usable
for emulation of other memory types
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Software programmable block program/erase restriction control
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Erase of selected block(s)
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Read page size of 128 bits (four words)
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ECC with single-bit correction, double-bit detection
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Program page size of 128 bits (four words) to accelerate programming
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ECC single-bit error corrections are visible to software
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Minimum program size is two consecutive 32-bit words, aligned on a 0-modulo-8 byte address,
due to ECC
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Embedded hardware program and erase algorithm
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Erase suspend, program suspend and erase-suspended program
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Shadow information stored in non-volatile shadow block
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Independent program/erase of the shadow block
1.4.10
BAM
The BAM (Boot Assist Module) is a block of read-only memory that is programmed once by Freescale
and is identical for all MPC5644A MCUs. The BAM program is executed every time the MCU is
powered-on or reset in normal mode. The BAM supports different modes of booting. They are:
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Booting from internal flash memory
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Serial boot loading (A program is downloaded into RAM via eSCI or the FlexCAN and then
executed)
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Booting from external memory on external bus
The BAM also reads the reset configuration half word (RCHW) from internal flash memory and
configures the MPC5644A hardware accordingly. The BAM provides the following features:
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Sets up MMU to cover all resources and mapping of all physical addresses to logical addresses with
minimum address translation
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Sets up MMU to allow user boot code to execute as either Power Architecture embedded category
(default) or as Freescale VLE code
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Location and detection of user boot code
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Automatic switch to serial boot mode if internal flash is blank or invalid
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Supports user programmable 64-bit password protection for serial boot mode
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Supports serial bootloading via FlexCAN bus and eSCI using Freescale protocol
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Supports serial bootloading via FlexCAN bus and eSCI with auto baud rate sensing
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Supports serial bootloading of either Power Architecture code (default) or Freescale VLE code
Summary of Contents for MPC5644A
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