Product Brief
TransDimension
TD243
An internal pull-up resistor on the DP1 line currently exists. This internal
resistor may be disabled via software. An external 1.5kΩ+/-1% resistor may
be connected across this pin and DP1 for the OTG port only. If not used,
this pin may be left floating. See Note 1 below.
PS
RPU
PW
PW
PW
PW
PS
Analog +3.3V.
AVDD
AVSS
VDD
Analog ground.
Digital +3.3V.
Digital ground.
VSS
No connection. These pins must be left floating.
NC
Figure 7 – Detailed Pin Descriptions
Note:
1. Pins /EXVBO, DRQ1 and DRQ0 have multiplexed functions. They are inputs at power on or hardware reset
to determine system configuration parameters - /EXVBO for the width of the data bus, and the other two for
the frequency of the crystal or crystal oscillator. After reset, they are outputs assuming responsibilities
suggested by their respective signal names.
2. The active levels for several pins (DRQ1, DRQ0, DACK1, DACK0, EPOT1, EOT0, and INT) are
programmable by software but default to active low after power on or hardware reset. This feature allows
glue-less interfacing with most microprocessors. Caution must be taken in user software to make sure
relevant operations (DMA and/or interrupt) are disabled before alterations to default active levels are made.
3. When not used, pins are pulled-up, pulled-down or left floating. Consult the Chapter on hardware and
software interfacing consideration for details.
4. The RPU pin allows the use of an external 1.50K± 1% resistor for developing USB applications that must
comply with legacy specifications
TransDimension Inc. — Proprietary
11
OXFORD [ OXFORD SEMICONDUCTOR ]
