Texas Instruments | Migrating from TMS320DM365 to TMS320DM368 | Application notes | Texas Instruments Migrating from TMS320DM365 to TMS320DM368 Application notes

Texas Instruments Migrating from TMS320DM365 to TMS320DM368 Application notes
Application Report
SPRABB2 – April 2010
TMS320DM365/DM368 Migration Guide
Miguel Alanis ............................................................................................... DSP Software Applications
ABSTRACT
This application report describes the changes necessary to migrate a DM365-based design from a DM365
device (216 MHz or 270 MHz or 300 MHz) to a DM368 (432 MHz) device. The DM368 device provides
increased performance as compared to the DM365 device.
The changes listed in this document are required by the DM368 device for proper operation. Other system
changes may be required to accommodate new speeds or capabilities in the system.
Additional information on these two devices is available on the TI website located in the respective product
folders at the following web pages.
TMS320DM365 - http://focus.ti.com/docs/prod/folders/print/tms320dm365.html.
TMS320DM368 - http://focus.ti.com/docs/prod/folders/print/tms320dm368.html
1
Contents
Overview .....................................................................................................................
1.1
Pin Map and Memory Map ........................................................................................
1.2
Feature Differences ................................................................................................
1.3
Board Hardware Changes ........................................................................................
2
2
2
2
List of Tables
............................................
1
DM365 and DM368 Major System Block Clocking Feature Differences
2
Minimum Required Changes .............................................................................................. 2
3
Probable Changes .......................................................................................................... 3
4
Other Potentially Required Changes ..................................................................................... 3
SPRABB2 – April 2010
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TMS320DM365/DM368 Migration Guide
Copyright © 2010, Texas Instruments Incorporated
2
1
Overview
www.ti.com
1
Overview
1.1
Pin Map and Memory Map
The pin map and memory map are the same for both DM365 and DM368 devices.
1.2
Feature Differences
Table 1 shows the feature differences between the DM365 and DM368 devices.
Table 1. DM365 and DM368 Major System Block Clocking Feature Differences
1.3
DM365-216
DM365-270
DM365-300
DM368
ARM926 RISC
216 MHz
270 MHz
300 MHz
432 MHz
Co-Processor (HDVICP)
173 MHz
216 MHz
270 MHz
340 MHz
Co-Processor (MJCP)
173 MHz
216 MHz
270 MHz
340 MHz
DDR2
173 MHz
216 MHz
270 MHz
340 MHz
mDDR
168 MHz
168 MHz
168 MHz
168 MHz
VPSS Logic Block
173 MHz
216 MHz
270 MHz
340 MHz
Peripheral System Bus
and EDMA
86.5 MHz
108 MHz
135 MHz
170 MHz
VPBE-VENC
27 MHz
74.25 MHz
74.25 MHz
74.25 MHz
VPFE
120 MHz
120 MHz
12 0 MHz
120 MHz
Board Hardware Changes
This section describes hardware changes needed to migrate from TMS320DM365 to TMS320DM368.
1.3.1
Minimum Changes Required
Table 2 summarizes the minimum required changes for DM368 432 MHz operation. These changes will
be required in all systems, unless the current DM365 design already meets or exceeds the new
requirement.
Table 2. Minimum Required Changes
1.3.2
Component
Change To
Comments
CVDD Core Power Supply
Core power supply is changed from 1.2V
(216 MHz and 270 MHz DM365 devices)
to 1.35V for the DM368 device; the
DM365 300 MHz device also operates at
1.35V.
The power supply design needs to
account for the additional current
consumed when running at a higher
frequency for DM368.
DM368 432 MHz operation has higher
CVDD power demands than 300 MHz
parts. Systems where the power supply
was barely adequate to supply 300 MHz
parts will require larger power supplies for
432 MHz DM368.
DDR2 memory
DDR2-800
In order to support a DDR2 clock
frequency of 340 MHz, a 2x speed or
greater DDR2 memory chip is required.
Probable Changes
Table 3 summarizes other changes that are likely to be required by systems of typical design. These
changes will not necessarily be required in all systems. Therefore, each of these probable changes should
be evaluated to determine if they are necessary for any given design.
2
TMS320DM365/DM368 Migration Guide
Copyright © 2010, Texas Instruments Incorporated
SPRABB2 – April 2010
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Overview
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Table 3. Probable Changes
Component
Change To
Comments
Video Port Back-end Display Video
Encoder Clock generation from Internal
PLLs
External clock source need:
74.25 MHz for displaying HD video
whenever an Oscillator frequency of 24
MHz or at 19.2 MHz is used.
At 432 MHz, and when using either the
recommended 24 MHz or 19.2 MHz
external crystal oscillators, the DM368
PLL multipliers and dividers can not
produce exact 74.25 MHz frequencies. In
systems where the VPBE or other parts
are relying on internal clock sources to
generate these frequencies, the need for
an external clock will be required.
The external clock source can be an
existing clock source in the design of the
correct frequency, a fixed-frequency
Oscillator or Crystal Clock Generator, or
an external programmable can be used.
Voice Codec Frequency
1.3.3
A 432 MHz functional clock will result in
DM368 voice codec sampling frequency of
16.07KHz. The difference of 0.4375%
versus 16KHz specification should be
acceptable for the majority of audio
applications.
If the DM368 voice codec is required to
operate at precisely 16KHz, then the
functional clock can be reduced to achieve
precisely that sample frequency. However,
the ARM926 and HDVICP will have to run
at a reduced rate, resulting in lower video
performance.
Other Potentially Required Changes
Table 4 summarizes other changes that may be required in some systems. These changes will not
necessarily be required in all systems. Therefore, each of these changes should be evaluated to
determine if they are necessary for any given design.
Table 4. Other Potentially Required Changes
Component
Change To
Comments
Heat Sink
Larger capacity heat sink
Systems where the heat sink was barely
adequate to cool a 300 MHz DM365
device will require larger heat sinks for a
432 MHz DM368 device.
SPRABB2 – April 2010
Submit Documentation Feedback
TMS320DM365/DM368 Migration Guide
Copyright © 2010, Texas Instruments Incorporated
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