MC68306 Motorola, MC68306 Datasheet - Page 154

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

An overview of the MC68306 implementation of IEEE 1149.1 is shown in Figure 7-1. The
MC68306 implementation includes a 16-state controller, a 3-bit instruction register, and
four test registers (a 1-bit bypass register, a 124-bit boundary scan register, a 3-bit module
mode register, and a 32-bit ID register). This implementation includes a dedicated TAP
consisting of the following signals:
7-2
TRST — active low JTAG logic reset (with pullup).
TCK
TMS — test mode select input (with an internal pullup resistor) that is sampled on the
TDI
TDO — three-state test data output that is actively driven in the shift-IR and shift-DR
TRST
TMS
TCK
TDI
— test clock input to synchronize the test logic (with pulldown).
— test data input (with an internal pullup resistor) that is sampled on the rising
rising edge of TCK to sequence the TAP controller's state machine.
edge of TCK.
controller states. TDO changes on the falling edge of TCK.
CTLR
TAP
TEST DATA REGISTERS
Figure 7-1. Test Access Port Block Diagram
123
BYPASS
2
BOUNDARY SCAN REGISTER
3-BIT INSTRUCTION REGISTER
MC68306 USER'S MANUAL
(124 BITS)
DECODER
31
2
MODE
ID
0
0
0
0
M
U
X
ID = 2040101D
M
U
X
MOTOROLA
TDO