MOTOROLA
Chapter 38. IEEE 1149.1 Test Access Port
38-3
Part VI. Debug and Test
Figure 38-2
.
TAP Controller State Machine
38.3 Boundary Scan Register
The MPC860 scan chain consists of a 475-bit boundary scan register that contains bits for
all signals, with the exception of the XTAL, EXTAL, and XFC pins, which are analog
signals. An IEEE-1149.1 compliant boundary scan register has been included on the
MPC860. This 475-bit boundary scan register can be connected between TDI and TDO
when EXTEST or SAMPLE/PRELOAD instructions are selected. The boundary scan
register is used for capturing data on the input signals, forcing Þxed values on the output
signals, and selecting the direction and drive characteristics (a logic value or high
impedance) of the bidirectional and three-state signals.
TEST LOGIC
RESET
RUNÑTEST/IDLE
SELECTÑDR_SCAN
CAPTUREÑDR
SHIFTÑDR
EXIT1ÑDR
PAUSEÑDR
EXIT2ÑDR
UPDATEÑDR
SELECTÑIR_SCAN
CAPTUREÑIR
SHIFTÑIR
EXIT1ÑIR
PAUSEÑIR
EXIT2ÑIR
UPDATEÑIR
0
0
0
0
1
1
1
0
0
0
0
1
1
1
1
1
0
0
1
1
1
1
Содержание MPC860 PowerQUICC
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Страница 274: ...III iv MPC860 PowerQUICC UserÕs Manual MOTOROLA Part III Configuration ...
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Страница 325: ...MOTOROLA Part IV Hardware Interface IV v Part IV Hardware Interface ...
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