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SPRS645F – AUGUST 2010 – REVISED OCTOBER 2013
3.8.2
3.8.3
Bus Holders
The device has special I/O bus-holder structures to ensure pins are not left floating when CV DD power is
removed while I/O power is applied. When CV DD is "ON", the bus-holders are disabled and the internal
pullups or pulldowns, if applicable, function normally. But when CV DD is "OFF" and the I/O supply is "ON",
the bus-holders become enabled and any applicable internal pullups and pulldowns are disabled.
The bus-holders are weak drivers on the pin and, for as long as CV DD is "OFF" and I/O power is "ON",
they hold the last state on the pin. If an external device is strongly driving the device I/O pin to the
opposite state then the bus-holder will flip state to match the external driver and DC current will stop.
This bus-holder feature prevents unnecessary power consumption when CV DD is "OFF"and I/O supply is
"ON". For example, current caused by undriven pins (input buffer oscillation) and/or DC current flowing
through pullups or pulldowns.
If external pullup or pulldown resistors are implemented, then care should be taken that those
pullup/pulldown resistors can exceed the internal bus-holder's max current and thereby cause the bus-
holder to flip state to match the state of the external pullup or pulldown. Otherwise, DC current will flow
unnecessarily. When CV DD power is applied, the bus holders are disabled (for further details on bus
holders, see Section 5.3.2 , Digital I/O Behavior When Core Power (CV DD ) is Down ).
CLKOUT Pin
For debug purposes, the DSP includes a CLKOUT pin which can be used to tap different clocks within the
clock generator. The SRC bits of the CLKOUT Control Source Register (CCSSR) can be used to specify
the source for the CLKOUT pin.
Note: The bootloader disables the CLKOUT pin via CLKOFF bit in the ST3_55 CPU register.
For more information on the ST3_55 CPU register, see the TMS320C55x 3.0 CPU Reference Guide
(literature number: SWPU073 ).
66
Device Configuration
Product Folder Links: TMS320C5515
Copyright ? 2010–2013, Texas Instruments Incorporated
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