mcf5407 Freescale Semiconductor, Inc, mcf5407 Datasheet - Page 466

• Manufacturer Part Number: mcf5407
• Description: Mcf5407 Coldfire Integrated Microprocessor User
• Manufacturer: Freescale Semiconductor, Inc

JTAG Signal Descriptions
Figure 19-1 is a block diagram of the MCF5407 implementation of the 1149.1 IEEE
standard. The test logic includes several test data registers, an instruction register,
instruction register control decode, and a 16-state dedicated TAP controller.
19.2 JTAG Signal Descriptions
JTAG operation on the MCF5407 is enabled when MTMOD0 is high (logic 1), as described
in Table 19-1. Otherwise, JTAG TAP signals, TCK, TMS, TDI, TDO, and TRST, are
interpreted as the debug port pins. MTMOD0 should not be changed while RSTI is
asserted.
19-2
TRST
TMS
TCK
TDI
that this logic does not affect system or debug operation.
V+
V+
V+
Figure 19-1. JTAG Test Logic Block Diagram
Bypass
3-Bit Instruction Register
Boundary Scan Register
3-Bit Instruction Decode
Test Data Registers
ID Code
MCF5407 User’s Manual
TAP
M
U
X
M
U
X
TDO