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Boundary-Scan Architecture
The
instruction allows internal data to be driven to the boundary
EXTEST
outputs and external data to be captured on the boundary inputs.
To protect the internal logic when the boundary outputs are over-
driven or signals are received on the boundary inputs, make sure
that nothing else drives data on the processor's output pins.
SAMPLE/PRELOAD – Binary Code 10000
The
SAMPLE/PRELOAD
Boundary-Scan register to be connected between
instruction has no effect on internal logic.
The
part of the instruction allows a snapshot of the inputs and
SAMPLE
outputs captured on the boundary-scan cells. Data is sampled on the ris-
ing edge of
TCK
The
part of the instruction allows data to be loaded on the device
PRELOAD
pins and driven out on the board with the
loaded on the pins on the falling edge of
BYPASS – Binary Code 11111
The
instruction selects the
BYPASS
and
. The instruction has no effect on the internal logic. No data
TDO
inversion should occur between
Boundary-Scan Register
The boundary-scan register is selected by the
instructions. These instructions allow the pins of the processor to be con-
trolled and sampled for board-level testing.
B-6
instruction performs two functions and selects the
.
TDI
ADSP-BF537 Blackfin Processor Hardware Reference
TDI
instruction. Data is pre-
EXTEST
.
TCK
register to be connected to
BYPASS
and
.
TDO
EXTEST
and
. The
TDO
TDI
and
SAMPLE/PRELOAD
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