Instruction Manual

__________________________________________________________________________________________________________ 11-8
MAXQ7667 User’s Guide
11.4.6 TAP Communication Examples—IR-Scans and DR-Scans
F
igures 11-3 and 11-4 illustrate examples of communication between the host JTAG controller and the TAP of the MAXQ7667. The host
controls the TCK and TMS signals to move through the desired TAP states while accessing the selected shift register through the TDI
input and TDO output pair.
Figure 11-3. TAP Controller Debug Mode—IR-Scan Example
NEW INSTRUCTION
INSTRUCTION REGISTER
TCK
TMS
TDI
TDO
CONTROL
STATE
IR SHIFT
REGISTER
IR PARALLEL
OUTPUT
REGISTER
SELECTED
TDO
ENABLE
BYPASS
DON'T CARE OR UNDEFINED
DON'T CARE OR UNDEFINED
DON'T CARE OR UNDEFINED
DON'T CARE OR UNDEFINED
TEST-LOGIC-RESET
RUN-TEST/IDLE
SELECT-DR-SCAN
SELECT-IR-SCAN
CAPTURE-IR
SHIFT-IR
SHIFT-IR
EXIT1-IR
EXIT1-IR
UPDATE-IR
RUN-TEST/IDLE
EXIT2-IR
PAUSE-IR