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MPC801 PRODUCT INFORMATION
MOTOROLA
MPC801 APPLICATIONS
The MPC801 device is specifically designed to be a general-purpose, low-cost entry point to the embedded
PowerPC Family at Motorola. The device excels in applications that require the performance of a single-issue
PowerPC core with moderate amounts of data and instruction cache. It can support alternate bus masters in
addition to providing all the basic features of glueless memory connections, but does not provide a wealth of
serial connectivity. Instead, it supplies simple UART serial channels as well as I
onboard communication to other peripheral chips.
2
C and SPI channels for
The MPC801 excels in low-power and portable applications due to its expansive power-down modes. In
addition, the normal operation current is low. The MPC801 is ideal for applications where a significant portion
of the user’s added value is in peripherals or ASICs and a low-cost general-purpose CPU is required. The
programmable flexibility of the memory controller ensures that the board design can accommodate future
memory types without hardware changes, thus enabling the ASIC to concentrate on other system goals.
DIFFERENCES BETWEEN THE MPC801 AND THE MPC860
The MPC801 can be considered a subset of the standard MPC860 device. The following modifications were
made to the MPC860 to create the MPC801:
4K instruction cache reduced to 2K
4K data cache reduced to 1K
32-bit instruction and data TLBs reduced to eight TLB entries each
32-bit address bus reduced to 26 bits
PCMCIA support eliminated
All existing serial interface logic (including their respective DMAs) replaced with two UARTs, one I
an SPI (all non-DMA based). The UARTs are modeled after the MC68328 DragonBall
2
C and
.
MPC801 GLUELESS SYSTEM DESIGN
A fundamental design goal of the MPC801 was to have a flexible interface to other system components.
Figure 2 shows a system configuration that offers one flash EPROM and supports DRAM SIMM and one
SRAM. Depending on the capacitance on the system bus, external buffers may be required. From a logic
standpoint, however, a glueless system is maintained.