Texas Instruments | Migrating From TMS320DM6446 594 MHz to 810 MHz | Application notes | Texas Instruments Migrating From TMS320DM6446 594 MHz to 810 MHz Application notes

Texas Instruments Migrating From TMS320DM6446 594 MHz to 810 MHz Application notes
Application Report
SPRABB5 – July 2010
Migrating From TMS320DM6446 594 MHz to 810 MHz
Paul Yin
ABSTRACT
This application report is intended to provide an overview of changes necessary to upgrade a DM6446based design from the 513 MHz or 594 MHz device to an 810 MHz device. The changes listed below are
required by the 810 MHz device for proper operation; other system changes may be required to
accommodate new speeds or capabilities in the system.
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Contents
Board Hardware Changes .................................................................................................. 2
Software/Firmware Changes ............................................................................................... 3
References ................................................................................................................... 3
List of Tables
1
Minimum Required Changes ............................................................................................... 2
2
Other Potentially Required Changes ...................................................................................... 3
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Minimum Required Changes ............................................................................................... 3
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SPRABB5 – July 2010
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Board Hardware Changes
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Board Hardware Changes
Table 1 summarizes the minimum changes required for the 810 MHz operation. These changes are
required in all systems, unless the current design already meets or exceeds the new requirement.
Table 1. Minimum Required Changes
Component
Change To
Comments
CVDD Power Supply
Need 1.3 V instead of 1.2 V. Furthermore, the
core power will nearly double (former 1.5W
applications will now be in the 2.5W range), so
the power supply design needs to account for the
additional current
810 MHz operation will have higher CVDD power
demands than the 513 or 594 MHz parts. In systems
where the power supply was barely adequate to supply
513 or 594 MHz parts, a larger power supply is
required for 810 MHz operation.
810 MHz maximum power consumption is estimated at
2.5W. Until the final power data can be obtained,
designers should allow a large capacity (>2 A) for the
CVDD supply.
Note that the VDAC requires a 1.2 V power supply; a
level shifter might be required to convert the 1.3 V to
1.2 V if no additional power supply (1.2 V) is placed on
the board when the CVDD power supply is changed to
1.3 V.
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Migrating From TMS320DM6446 594 MHz to 810 MHz
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Software/Firmware Changes
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Table 2 summarizes other changes that may be required in some systems. These changes are not
required in all systems; therefore, they should be evaluated to determine if they are necessary for any
given design.
Table 2. 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 594 MHz device will require a larger heat sink
for 810 MHz operation.
For more information, see TMS320DM644x Thermal
Considerations (SPRAAE4).
NOTE: Video processing back end (VPBE) pixel clock for HDTV output has always been sourced
externally for DM644x devices; therefore, no additional hardware modification is needed.
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Software/Firmware Changes
Table 3 summarizes the minimum changes required for the 810 MHz operation. These changes are
required in all systems, unless the current design already meets or exceeds the new requirement.
Table 3. Minimum Required Changes
Component
Change To
Comments
UBL
Correct PLL1 and PLL2 multipliers
TI will supply a new UBL with the correct programming
for the 810 MHz DSP and 189 MHz DDR, as well as
keeping the VPBE digital-analog converter (DAC)
system clock set at 54 MHz.
Users of other frequencies need to change the phaselocked loop (PLL) multiply, divide, and DDR timing
parameters as appropriate.
3
References
•
TMS320DM644x Thermal Considerations (SPRAAE4)
SPRABB5 – July 2010
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