Toshiba TDP-D1 Service Manual page 92

External Interrupts
External interrupt inputs on the ImageProcessor allow the processors to be interrupted by
external devices. The polarity and mode of these interrupts are programmable. Refer to the
ImageProcessor Theory of Operations. These inputs are not 5V tolerant, so 3.3V devices or buffers
must be used.
Infrared (IR) Receivers
The Infrared Receivers IR) inputs allow IR diodes to be directly connected to the
ImageProcessor. This allows IR pulses to be converted into key codes. Decoding of the signals is
then handled by the ImageProcessor. These inputs are not 5V tolerant, so use 3.3V devices or buffers.
The IR receiver diode outputs 5V logic. However, since the output of this diode is an open collector,
and the pull-up resistance is very large (approximately 10K
the ImageProcessor input is very small and will cause no damage.
Universal Asynchronous Receiver Transmitter (UART)
The UART is typically used for serial communications with a PC for FLASH download and
debugging. Pull down RxD if no transceiver is mounted on the board. The RxD input is not 5V
tolerant.
Display Port (DPort)
The ImageProcessor Display Port (DPort) provides fully programmable timing and control signals to
the LCD device. The data outputs have sufficient current to drive short internal cables. An external
TMDS or LVDS transmitter can also be driven with no glue logic. If a single pixel-wide interface is
used it will come out on the evens pins only. The RGB data is most-significant justified when there
is less than 8-bits per color. Proper series termination of all DPort signals is essential for good EMI
performance.
), the potential current injected into
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