AN2584 Freescale Semiconductor / Motorola, AN2584 Datasheet

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AN2584

Manufacturer Part Number
AN2584
Description
Migrating from the MPC852T to the MPC875
Manufacturer
Freescale Semiconductor / Motorola
Datasheet
Application Note
AN2584
Rev. 0, 12/2003
Migrating from the MPC852T
to the MPC875
Ned Reinhold,
NCSD Applications
This document contains information that is useful when migrating from the MPC852T to the
MPC875. Refer to the MPC885 PowerQUICC Family Reference Manual and
MPC875/MPC870 Hardware Specifications ( for MPC875 ) , and the MPC866 PowerQUICC
Family Users Manual and MPC852T Hardware Specifications ( for MPC852T ) for more
detailed information.
This document contains the following topics
1 Overview
The need for embedded security and an additional Fast Ethernet channel makes the transition
from an MPC852T to an MPC875 a logical progression. Both processors contain the same
embedded PowerPC
software migration.
The MPC875 has twice the internal L1 cache as the MPC852T for a total of 8 Kbytes for data
and 8 Kbytes for instructions. The MPC875 has a faster core and faster bus speed than the
MPC852T. The MPC875 incorporates four 16-bit timers that can be cascaded into two 32-bit
timers.
The MPC875 incorporates two Fast Ethernet channels instead of one and has a similar CPM.
However, the variety of serial channels has changed. The MPC875 supports an I2C controller
and an on-chip security processor that can perform encryption on the serial channels and TDM
interface.
Figure 1 and Figure 2 show block diagrams for MPC875 and MPC852T, respectively.
Topic
Section 1, “Overview”
Section 2, “Feature Comparison”
Section 3, “The MPC875”
Section 4, “The MPC852T”
Section 5, “Similarities and Differences between MPC852T and MPC875”
Section 6, “New Features for MPC875”
Section 7, “Summary”
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
TM
architecture-based core and system integration unit (SIU) to ease
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AN2584 Summary of contents

Page 1

... Freescale Semiconductor, Inc. Application Note AN2584 Rev. 0, 12/2003 Migrating from the MPC852T to the MPC875 Ned Reinhold, This document contains information that is useful when migrating from the MPC852T to the NCSD Applications MPC875. Refer to the MPC885 PowerQUICC Family Reference Manual and MPC875/MPC870 Hardware Specifications ( for MPC875 ) , and the MPC866 PowerQUICC Family Users Manual and MPC852T Hardware Specifi ...

Page 2

Freescale Semiconductor, Inc. Feature Comparison Feature Comparison 2 Feature Comparison The MPC852T and MPC875 communications microprocessors incorporate many types of communications engines to accommodate different system requirements. The following sections discuss hardware and protocol features of both microprocessors. 2.1 Hardware ...

Page 3

Freescale Semiconductor, Inc. The MPC875 incorporates the same embedded MPC8XX processor core and similar CPM and SIU. The MPC875 also supports an on-chip security engine and two 10/100 Fast Ethernet controller modules. The CPM supports USB 1.1, one SCC (SCC4), ...

Page 4

Freescale Semiconductor, Inc. Similarities and Differences between MPC852T and MPC875 Similarities and Differences between MPC852T and MPC875 two SCCs (SCCs 3&4), SMC1, and the SPI. The SCCs can support 802.3 Ethernet, HDLC/SDLC, UART, and transparent protocols. Instruction Instruction Cache Bus ...

Page 5

Freescale Semiconductor, Inc. Figure 3 shows the MPC875 pinout. MOTOROLA Migrating from the MPC852T to the MPC875 For More Information On This Product, Similarities and Differences between MPC852T and MPC875 Figure 3. MPC875 Pinout Go to: www.freescale.com 5 ...

Page 6

Freescale Semiconductor, Inc. Similarities and Differences between MPC852T and MPC875 Similarities and Differences between MPC852T and MPC875 Figure 4 shows the MPC852T pinout. 5.2 Memory Map The memory maps for both the MPC852T and the MPC875 are very similar except ...

Page 7

Freescale Semiconductor, Inc. 6 New Features for MPC875 The following sections discuss new features of MPC875. 6.1 IMMR[ISB] bits 14:15 The IMMR[ISB] bits 14:15 have new meaning with the MPC875. When IMMR[ISB] bits 14:15 are cleared, the internal memory map ...

Page 8

... The PowerPC name is a trademark of IBM Corp. and is used under license. All other product or service names are the property of their respective owners. Motorola, Inc Equal Opportunity/Affirmative Action Employer. © Motorola, Inc. 2003 AN2584 For More Information On This Product, Go to: www.freescale.com ...

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