Motorola MPC823e - Page 1126

IEEE 1149.1 Test Access Port
MOTOROLA MPC823e REFERENCE MANUAL 21-5
IEEE 1149.1 TEST
21
ACCESS PORT
Figure 21-4. Observe-Only Input Pin Cell (I.Obs)
Figure 21-5. Output Control Cell (IO.CTL)
1
1
MUX
G1
C
D
DATA TO
SYSTEM
LOGIC
INPUT
PIN
S
TO NEXT CELL
1
1
MUX
G1
1
1
MUX
G1
C
D
C
D
FROM LAST CELL
CLOCK DR
UPDATE DR
SHIFT DR
1 — EXTEST | CLAMP
TO OUTPU
T
BUFFER
0 — OTHERWISE
TO NEXT CELL
O
UTPUT CONTROL
LOGIC
FROM SYSTEM