Motorola MPC823e User Manual

IEEE 1149.1 Test Access Port
MOTOROLA MPC823e REFERENCE MANUAL 21-3
IEEE 1149.1 TEST
21
ACCESS PORT
21.1 THE 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
value shown adjacent to each bubble in the figure below represents the value of the TMS
signal sampled on the rising edge of the TCK signal.
Figure 21-2. TAP Controller State Machine
TEST LOGIC
RESET
RUN—TEST/IDLE SELECT—DR_SCAN
CAPTURE—DR
SHIFT—DR
EXIT1—DR
PAUSE—DR
EXIT2—DR
UPDATE—DR
SELECT—IR_SCAN
CAPTURE—IR
SHIFT—IR
EXIT1—IR
PAUSE—IR
EXIT2—IR
UPDATE—IR
00
0
0
1
1
1
0
0
0
0
1
1
11
1
0
0
1
1
11

Motorola MPC823e Specifications

General

Brand	Motorola
Model	MPC823e
Category	Computer Hardware
Language	English