Pinout Detail Tables And Signal Descriptions - Digi NS7520B-1-C36 Hardware Reference Manual

Pinout detail tables and signal descriptions

Each pinout table applies to a specific interface and contains the following
information:
Column
Signal
Pin
_
I/O
OD
Notes:
NO CONNECT
The 177th pin (package ball) is for alignment of the package on the PCB.
Description
The pin name for each I/O signal. Some signals have multiple function modes and are identified
accordingly. The mode is configured through firmware using one or more configuration
registers.
The pin number assignment for a specific I/O signal.
U next to the pin number indicates that the pin is a pullup resistor (input current source).
D next to the pin number indicates that the pin is a pulldown resistor (input current sink).
No value next to the pin indicates that the pin has neither a pullup nor pulldown resistor.
See Figure 28, "Internal pullup characteristics," on page 260 and Figure 29, "Internal pulldown
characteristics," on page 260 for an illustration of the characteristics of these pins. Use the
figures to select the appropriate value of the complimentary resistor to drive the signal to the
opposite logic state. For those pins with no pullup or pulldown resistor, you must select the
appropriate value per your design requirements.
An underscore (bar) indicates that the pin is active low.
The type of signal — input, output, or input/output.
The output drive strength of an output buffer. The NS7520 uses one of three drivers:
2 mA
4 mA
8 mA
as a description for a pin means do not connect to this pin.
P i n o u t a n d P a c k a g i n g
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