P i n o u t d e t a i l t a b l e s a n d s i g n a l d e s c r i p t i o n s

JTAG test (ARM debugger)

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

Symbol

Pin

I/O

OD

Description

 

 

 

 

 

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.

 

 

 

 

 

Table 13: JTAG test pinout

Signal descriptions

Mnemonic

Signal

Description

 

 

 

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.

Table 14: ARM debugger signal description

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Digi NS7520 manual Jtag test ARM debugger, Jtag test pinout, ARM debugger signal description