MC68306 Motorola, MC68306 Datasheet - Page 155

• Manufacturer Part Number: MC68306
• Description: Integrated EC000 Processor
• Manufacturer: Motorola

7.2 TAP CONTROLLER
The TAP controller is responsible for interpreting the sequence of logical values on the
TMS signal. It is a synchronous state machine that controls the operation of the JTAG
logic. The state machine is shown in Figure 7-2; the value shown adjacent to each arc
represents the value of the TMS signal sampled on the rising edge of the TCK signal. For
a description of the TAP controller states, please refer to the IEEE 1149.1 document.
7.3 BOUNDARY SCAN REGISTER
The MC68306 IEEE 1149.1 implementation has a 124-bit boundary scan register. This
register contains bits for all device signal and clock pins and associated control signals.
MOTOROLA
1
0
RUN-TEST/IDLE
TEST LOGIC
RESET
0
Figure 7-2. TAP Controller State Machine
1
0
1
MC68306 USER'S MANUAL
1
SELECT-DR_SCAN
CAPTURE-DR
UPDATE-DR
PAUSE-DR
SHIFT-DR
EXIT1-DR
EXIT2-DR
0
1
0
1
0
0
1
1
1
0
0
0
1
1
SELECT-IR_SCAN
CAPTURE-IR
UPDATE -IR
PAUSE-IR
SHIFT-IR
EXIT1-IR
EXIT2-IR
1
0
0
0
1
1
0
1
1
0
0
7-3