mcf5271 Freescale Semiconductor, Inc, mcf5271 Datasheet - Page 9

• Manufacturer Part Number: mcf5271
• Description: Mcf5271 Integrated Microprocessor
• Manufacturer: Freescale Semiconductor, Inc

system stack, or for storing FEC data buffers. Because the SRAM module is physically connected to the
processor's high-speed local bus, it can quickly service core-initiated accesses or memory-referencing
commands from the debug module.
The SRAM module is also accessible by the DMA and FEC non-core bus masters. The dual-ported nature
of the SRAM makes it ideal for implementing applications with double-buffer schemes, where the
processor and a DMA device operate in alternate regions of the SRAM to maximize system performance.
As an example, system performance can be increased significantly if Ethernet packets are moved from the
FEC into the SRAM (rather than external memory) prior to any processing.
3.6
The MCF5271’s integrated Fast Ethernet Controller (FEC) performs the full set of IEEE 802.3/Ethernet
CSMA/CD media access control and channel interface functions. The FEC supports connection and
functionality for the 10/100 Mbps 802.3 media independent interface (MII). It requires an external
transceiver (PHY) to complete the interface to the media.
3.7
The MCF5271 contains three full-duplex UARTs that function independently. The three UARTs can be
clocked by the system bus clock, eliminating the need for an externally supplied clock. They can use DMA
requests on transmit-ready and receive-ready as well as interrupt requests for servicing. Flow control is
only available on two of the UARTs.
3.8
The I
exchange, minimizing the interconnection between devices. This bus is suitable for applications requiring
occasional communications over a short distance between many devices.
3.9
The queued serial peripheral interface module provides a high-speed synchronous serial peripheral
interface with queued transfer capability. It allows up to 16 transfers to be queued at once, eliminating CPU
intervention between transfers.
3.10 Cryptography
The superset device, MCF5271, incorporates small, fast, dedicated hardware accelerators for random
number generation, message digest and hashing, and the DES, 3DES, and AES block cipher functions
allowing for the implementation of common Internet security protocol cryptography operations with
performance well in excess of software-only algorithms.
Freescale Semiconductor
2
C bus is a two-wire, bidirectional serial bus that provides a simple, efficient method of data
Fast Ethernet Controller (FEC)
UARTs
I
QSPI
2
C Bus
MCF5271 Integrated Microprocessor Hardware Specification, Rev. 1.2
Features
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