System Mode (Test Support) - Digi NS7520B-1-C36 Hardware Reference Manual

This figure shows the timing and specification for RESET_ rise/fall times:

System mode (test support)

PLLTST_, BISTEN_, and SCANEN_ primary inputs control different test modes for both
functional and manufacturing test operations. See Chapter 5, "SYS Module," for more
information.
Symbol
PLLTST_
BISTEN_
SCANEN_
Table 12: System mode and system reset pinout
tF
tF max = 18ns
Vin = 2.0V to 0.8V
Pin I/O
N15 I
M15 I
L13 I
P i n o u t a n d P a c k a g i n g
tR
tR max = 18ns
Vin = 0.8V to 2.0V
OD Description
Encoded with BISTEN_ and SCANEN_
Add an external pullup to 3.3V or pulldown to
GND.
Encoded with PLLTST_ and SCANEN_
Add an external pullup to 3.3V or pulldown to
GND.
Encoded with BISTEN_ and PLLTST_
Add an external pullup to 3.3V or pulldown to
GND.
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