Digi NS7520 User Manual

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N S 7 5 2 0   H a r d w a r e   R e f e r e n c e ,   R e v .   D     0 3 / 2 0 0 6

JTAG boundary scan allows a tester to check the soldering of all signal pins and tri-
state all outputs.

TDI

N14 U

I

Test data in

TDO

M13

O

2

Test data out

TMS

M12 U

I

Test mode select

TRST_

M14

I

Test mode reset
Requires external termination when not 
being used (see Figure 4, "TRST_ 
termination," on page 27 for an 
illustration of the termination circuit on 
the development PCB).

TCK

P15

I

Test mode clock
Add an external pullup to 3.3V.

TDI

Test data in

TDI operates the JTAG standard. Consult the 
JTAG specifications for use in boundary-scan 
testing. These signals meet the requirements of the 
Raven and Jeeni debuggers.

TDO

Test data out

TDO operates the JTAG standard. Consult the 
JTAG specifications for use in boundary-scan 
testing. These signals meet the requirements of the 
Raven and Jeeni debuggers.

TMS

Test mode select

TMS operates the JTAG standard. Consult the 
JTAG specifications for use in boundary-scan 
testing. These signals meet the requirements of the 
Raven and Jeeni debuggers.