No Connect" Pins; General-Purpose I/O - Digi NS7520B-1-C36 Hardware Reference Manual

"No connect" pins

Pin
R13
P12
N12
R15
M11
P11
N11
R12
R14
P13
Table 8: "No connect" pins
Note:

General-purpose I/O

GPIO
signal
PORTA7
PORTA6
PORTA5
Table 9: GPIO pinout
Description
Add a 15K ohm pulldown to GND (15K ohm is the recommended value; 10–
20K ohms is acceptable)
Add a 15K ohm pulldown to GND (15K ohm is the recommended value; 10–
20K ohms is acceptable)
Tie to GND
XTALB2: NO CONNECT
NO CONNECT
NO CONNECT
NO CONNECT
NO CONNECT
NO CONNECT
NO CONNECT
If your design implements 10–20K ohm pullups instead of pulldowns on
R13 and P12, and a pullup on N12 instead of GND, no action is required.
Serial Other
signal signal
TXDA
DTRA_ DREQ1_
RTSA_
Serial channel
Pin I/O OD description
J14 U I/O 2 Channel 1 TXD
J13 U I/O 2 Channel 1 DTR_
J15 U I/O 2 Channel 1 RTS_
w w w . d i g i e m b e d d e d . c o m
P i n o u t a n d P a c k a g i n g
Other
description
DMA channel 3/5
Req
2 1