VCE6467T Datasheet, PDF (134/352 Pages) Texas Instruments – VCE6467T, AVCE6467T Digital Media System-on-Chip

VCE6467T, AVCE6467T
SPRS690 – MARCH 2011
3.8 Debugging Considerations
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3.8.1 Pullup/Pulldown Resistors
Proper board design should ensure that input pins to the TMS320DM646x DMSoC device always be at a
valid logic level and not floating. This may be achieved via pullup/pulldown resistors. The TMS320DM646x
DMSoC 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.
For the boot and configuration pins (listed in Table 2-6, 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-kΩ 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-kΩ 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 most systems, a 20-kΩ resistor can also be used as an external PU/PD on the pins that have
IPUs/IPDs disabled and require an external PU/PD resistor while still 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 VCE6467T DMSoC, see Section 5.3, Electrical Characteristics Over Recommended Ranges of Supply
Voltage and Operating Temperature.
134 Device Configurations
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