6-2
MC92603 Quad Gigabit Ethernet Transceiver Reference Manual
MOTOROLA
IEEE Std. 1149.1 Implementation
NOTE
The TMS, TDI, and TRST, have 100-K
Ω
pull-ups. If TRST is
not held low during power up or does not receive an active low
preset after power up, the test logic may assume an
indeterminate state disabling some of the normal transceiver
functions. It is recommended that TRST be terminated in one
of the following ways:
•
Drive TRST with a TAP controller that provides a reset
after power up.
•
Connect TRST to RESET.
•
Terminate TRST with a 1-K
Ω
resistor (or hardwire) to
ground.
6.1.2
Instruction Register
Figure 6-1 shows the format for the instruction register.
Figure 6-1. Instruction Register
6.1.3
Instructions
Table 6-2 lists the public instructions provided in the implementation and their instruction
codes.
Bit Position
3
2
1
0
Field
IR
Capture-IR Value
0
0
0
1
Table 6-2. Tap Controller Public Instructions
Instruction
Code
Enabled Serial Test Data Path
BYPASS
1111
Bypass register
CLAMP
1100
Bypass register
EXTEST
0000
Boundary scan register
HIGHZ
1001
Bypass register
IDCODE
0001
ID register
SAMPLE
0010
Boundary scan register
Содержание MC92603
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