Motorola MSC8101 ADS User's Guide Page 235

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EOnCE/JTAG Basics
EOnCE/JTAG 12-3
12.1.1 Instructions
The host sends JTAG instructions to the MSC8101 least significant bit first. As Figure
12-2 shows, the
TDI pin inputs the instruction into the MSC8101 and is sampled on the
rising edge of
TCK.
Figure 12-2. Test Logic Diagram Showing the Five-Bit Instruction Register
Table 12-2 describes the JTAG instructions and lists the bit values of the five-bit
instruction register for each instruction (B0–B4, with B0 as the least significant bit). In the
MSC8101, there is only one EOnCE module.
Table 12-1. JTAG Scan Paths
Select-DR Scan Path Select-IR Scan Path
Select-DR_SCAN Select-IR_SCAN
Capture-DR Capture-IR
Shift-DR Shift-IR
Exit1-DR Exit1-IR
Update-DR Update-IR
M
U
X
5–Bit Instruction Register
TDO
TDI
TMS
TCK
TRST
12
TAP Controller
3
EOnCE Logic
Instruction Apply and Decode Register
Boundary Scan Register
Bypass Register
Identification Register
M
U
X
0
M
U
X
M
U
X
4
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