ADDR10 datasheet(20/68 Pages) ETC2

20 / 68 page

System mod e (test supp ort)

NS 75 20 Da ta shee t

03 /2 00 6

System mode (test support)

PLLTST_, BISTEN_, and SCANEN_ primary inputs control different test modes for both functional

and manufacturing test operations (see Table 3: "NS7520 test modes" on page 22).

JTAG test

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

outputs.

ARM debugger signal descriptions

Symbol

I/O

Description

PLLTST_

N15

Encoded with BISTEN_ and SCANEN_

Add an external pullup to 3.3V or pulldown to GND.

BISTEN_

M15

Encoded with PLLTST_ and SCANEN_

Add an external pullup to 3.3V or pulldown to GND.

SCANEN_

L13

Encoded with BISTEN_ and PLLTST_

Add an external pullup to 3.3V or pulldown to GND.

Symbol

I/O

Description

TDI

N14 U

Test data in.

TDO

M13

Test data out.

TMS

M12 U

Test mode select.

TRST_

M14

Test mode reset.

Requires external termination when not being used (see

Figure 3, "TRST_ termination," on page 17 for an

illustration of the termination circuit on the development

PCB).

TCK

P15

Test mode clock.

Add an external pullup to 3.3V.

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.

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