Maxim-integrated MAXQ7667 Manual do Utilizador descarregar pdf (Página 194)

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11-5 __________________________________________________________________________________________________________

MAXQ7667 User’s Guide

11.4 TAP Controller Operation

he MAXQ7667 TAP controller is formed by a finite state machine that provides 16 operational states for access control. The TAP state

control is achieved through host manipulation of the TMS and TCK signals. The TMS signal is sampled at the rising edge of TCK and

ecoded by the TAP controller to control movement between the TAP states. The TDI input and TDO output are meaningful once the

TAP is in a serial shift state. This section provides a brief description of the TAP controller state machine and its state transitions.

The state diagram in Figure 11-2 summarizes the transitions caused by the TMS signal sampling on the rising edge at TCK. The TMS

signal value is shown adjacent to each state transition in the figure.

TEST-LOGIC-RESET

RUN-TEST-IDLE

SELECT-DR-SCAN

EXIT2-DR

CAPTURE-DR

SHIFT-DR

XIT1-DR

PAUSE-DR

UPDATE-DR

SELECT-IR-SCAN

EXIT2-IR

CAPTURE-IR

SHIFT-IR

XIT1-IR

PAUSE-IR

UPDATE-IR

Figur

e 11-2. T

AP Contr

oller State Diagram

1 2 ... 189 190 191 192 193 194 195 196 197 198 199 ... 346 347

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