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Signal Descriptions

Chapter 5

AMD-K6® Processor Data Sheet

20695H/0—March 1998

Preliminary Information

5.46

TDI (Test Data Input)

Input, Internal Pullup

Summary

TDI i s t h e se ri a l test data an d i n str u cti o n i npu t fo r

boundary-scan testing using the Test Access Port (TAP). See

“Boundary-Scan Test Access Port (TAP)” on page 205 for details

regarding the operation of the TAP controller.

Sampled

The processor samples TDI on every rising TCK edge but only

while in the Shift-IR and Shift-DR states.

5.47

TDO (Test Data Output)

Output

Summary

TDO is the se rial test data and instruction out put fo r

boundary-scan testing using the Test Access Port (TAP). See

“Boundary-Scan Test Access Port (TAP)” on page 205 for details

regarding the operation of the TAP controller.

Driven and Floated

The processor drives TDO on every falling TCK edge but only

while in the Shift-IR and Shift-DR states. TDO is floated at all

other times.

5.48

TMS (Test Mode Select)

Input, Internal Pullup

Summary

TMS specifies the test function and sequence of state changes

for boundary-scan testing using the Test Access Port (TAP). See

“Boundary-Scan Test Access Port (TAP)” on page 205 for details

regarding the operation of the TAP controller.

Sampled

The processor samples TMS on every rising TCK edge. If TMS is

sampled High for five or more consecutive clocks, the TAP

controller enters its Test-Logic-Reset state, regardless of the

controller state. This action is the same as that achieved by

asserting TRST#.

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