DSP56371 datasheet(33/68 Pages) FREESCALE

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Maximum Ratings

DSP56371 Data Sheet, Rev. 4.1

Freescale Semiconductor

3.13 JTAG/OnCE Interface

Maximum Ratings

CAUTION

This device contains circuitry protecting against damage due to high static voltage or

electrical fields. However, normal precautions should be taken to avoid exceeding

maximum voltage ratings. Reliability of operation is enhanced if unused inputs are pulled

to an appropriate logic voltage level (for example, either GND or VDD). The suggested

value for a pull-up or pull-down resistor is 4.7 k

Ω.

NOTE

In the calculation of timing requirements, adding a maximum value of one specification to

a minimum value of another specification does not yield a reasonable sum. A maximum

specification is calculated using a worst case variation of process parameter values in one

direction. The minimum specification is calculated using the worst case for the same

parameters in the opposite direction. Therefore, a “maximum” value for a specification will

never occur in the same device that has a “minimum” value for another specification;

adding a maximum to a minimum represents a condition that can never exist.

Table 13. JTAG/OnCE Interface

Signal

Name

Signal

Type

State

during

Reset

Signal Description

TCK

Input

Test Clock—TCK is a test clock input signal used to synchronize the JTAG

test logic. It has an internal pull-up resistor.

Internal Pull up resistor.

This input is 5 V tolerant.

TDI

Input

Test Data Input—TDI is a test data serial input signal used for test instructions

and data. TDI is sampled on the rising edge of TCK and has an internal pull-up

resistor.

Internal Pull up resistor.

This input is 5 V tolerant.

TDO

Output

Tri-state

Test Data Output—TDO is a test data serial output signal used for test

instructions and data. TDO is tri-statable and is actively driven in the shift-IR

and shift-DR controller states. TDO changes on the falling edge of TCK.

TMS

Input

Test Mode Select—TMS is an input signal used to sequence the test

controller’s state machine. TMS is sampled on the rising edge of TCK and has

an internal pull-up resistor.

Internal Pull up resistor.

This input is 5 V tolerant.

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