AMD AMD-K6-2/400 User Guide - Page 156
TMS (Test Mode Select), 5.50 TRST# (Test Reset
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Preliminary Information AMD-K6™-2E+ Embedded Processor Data Sheet 23542A/0-September 2000 5.49 TMS (Test Mode Select) Pin Attribute Summary Sampled Input, Internal Pullup 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 253 for details regarding the operation of the TAP controller. 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#. 5.50 TRST# (Test Reset) Pin Attribute Summary Input, Internal Pullup The assertion of TRST# initializes the Test Access Port (TAP) by resetting its state machine to the Test-Logic-Reset state. See "Boundary-Scan Test Access Port (TAP)" on page 253 for details regarding the operation of the TAP controller. Sampled TRST# is a completely asynchronous input that does not require a minimum setup and hold time relative to TCK. See Table 70 on page 308 for the minimum pulse width requirement. 134 Signal Descriptions Chapter 5