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參數(shù)資料
| 型號： | TMX320DM6437BZWTA |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Digital Media Processor |
| 中文描述： | 數(shù)字媒體處理器 |
| 文件頁數(shù)： | 158/309頁 |
| 文件大?。?/td> | 2216K |
| 代理商： | TMX320DM6437BZWTA |
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3.9 Debugging Considerations
3.9.1
Pullup/Pulldown Resistors
TMS320DM6437
Digital Media Processor
SPRS345B–NOVEMBER 2006–REVISED MARCH 2007
Proper board design should ensure that input pins to the DM643x DMP device always be at a valid logic
level and not floating. This may be achieved via pullup/pulldown resistors. The DM643x DMP features
internal pullup (IPU) and internal pulldown (IPD) resistors on most pins to eliminate the need, unless
otherwise noted, for
external
pullup/pulldown resistors.
An external pullup/pulldown resistor needs to be used in the following situations:
Boot and Configuration Pins
: If the pin is both routed out and 3-stated (not driven), an external
pullup/pulldown resistor is
strongly recommended
, even if the IPU/IPD matches the desired
value/state.
Other Input Pins
: If the IPU/IPD
does not
match the desired value/state, use an external
pullup/pulldown resistor to pull the signal to the opposite rail.
EMIFA Chip Select Outputs
: On DM6437, the EMIFA chip select pins (EM_CS2, EM_CS3, EM_CS4,
and EM_CS5) feature an internal pulldown (IPD) resistor. If these pins are connected and used as an
EMIFA chip select signal, for proper device operation, an external pullup resistor
must
be used to
ensure the EM_CSx function defaults to an inactive (high) state.
For the boot and configuration pins (listed in
Table 2-5
,
Boot Terminal Functions
), if they are both routed
out and 3-stated (not driven), it is
strongly recommended
that an external pullup/pulldown resistor be
implemented. Although, internal pullup/pulldown resistors exist on these pins and they may match the
desired configuration value, providing external connectivity can help ensure that valid logic levels are
latched on these device boot and configuration pins. In addition, applying external pullup/pulldown
resistors on the boot and configuration pins adds convenience to the user in debugging and flexibility in
switching operating modes.
Tips for choosing an external pullup/pulldown resistor:
Consider the total amount of current that may pass through the pullup or pulldown resistor. Make sure
to include the leakage currents of all the devices connected to the net, as well as any internal pullup or
pulldown resistors.
Decide a target value for the net. For a pulldown resistor, this should be below the lowest V
IL
level of
all inputs connected to the net. For a pullup resistor, this should be above the highest V
IH
level of all
inputs on the net. A reasonable choice would be to target the V
OL
or V
OH
levels for the logic family of
the limiting device; which, by definition, have margin to the V
IL
and V
IH
levels.
Select a pullup/pulldown resistor with the largest possible value; but, which can still ensure that the net
will reach the target pulled value when maximum current from all devices on the net is flowing through
the resistor. The current to be considered includes leakage current plus, any other internal and
external pullup/pulldown resistors on the net.
For bidirectional nets, there is an additional consideration which sets a lower limit on the resistance
value of the external resistor. Verify that the resistance is small enough that the weakest output buffer
can drive the net to the opposite logic level (including margin).
Remember to include tolerances when selecting the resistor value.
For pullup resistors, also remember to include tolerances on the DV
DD
rail.
For most systems, a 1-k
resistor can be used to oppose the IPU/IPD while meeting the above criteria.
Users should confirm this resistor value is correct for their specific application.
For most systems, a 20-k
resistor can be used to compliment the IPU/IPD on the boot and configuration
pins while meeting the above criteria. Users should confirm this resistor value is correct for their specific
application.
For more detailed information on input current (I
I
), and the low-/high-level input voltages (V
IL
and V
IH
) for
the DM643x DMP, see
Section 5.3
,
Electrical Characteristics Over Recommended Ranges of Supply
Voltage and Operating Temperature
.
Device Configurations
158
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相關(guān)代理商/技術(shù)參數(shù) |
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| TMX320DM6441CZWT | 制造商:Texas Instruments 功能描述: |
| TMX320DM6441DZWT | 制造商:Texas Instruments 功能描述:DAVINCI DIGITAL MEDIA SYSTEM-ON-CHIP - Tape and Reel |
| TMX320DM6443AZWT | 制造商:Rochester Electronics LLC 功能描述:DAVINCI DIGITAL MEDIA SYSTEM-ON-CHIP - Tape and Reel |
| TMX320DM6443BZWT | 制造商:Texas Instruments 功能描述: |
| TMX320DM6443CZWT | 制造商:Texas Instruments 功能描述: |
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