Boundary-Scan Architecture
C-6
ADSP-BF535 Blackfin Processor Hardware Reference
Public Instructions
The following are descriptions of the public JTAG scan instructions.
EXTEST – Binary Code 00000
The EXTEST instruction selects the Boundary-Scan register to be con-
nected between the
TDI
and
TDO
pins. This instruction allows testing of
on-board circuitry external to the device.
EXTEST allows internal data to be driven to the boundary 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 ADSP-BF535 processor’s out-
put pins.
SAMPLE/PRELOAD – Binary Code 10000
The SAMPLE/PRELOAD instruction performs two functions and selects
the Boundary-Scan register to be connected between
TDI
and
TDO
. The
instruction has no effect on internal logic.
The SAMPLE part of the instruction allows a snapshot of the inputs and
outputs captured on the boundary-scan cells. Data is sampled on the ris-
ing edge of
TCK
.
The PRELOAD part of the instruction allows data to be loaded on the
device pins and driven out on the board with the EXTEST instruction.
Data is preloaded on the pins on the falling edge of
TCK
.
Summary of Contents for ADSP-BF535 Blackfin
Page 80: ...Development Tools 1 26 ADSP BF535 Blackfin Processor Hardware Reference...
Page 312: ...Working With Memory 6 86 ADSP BF535 Blackfin Processor Hardware Reference...
Page 332: ...System Interfaces 7 20 ADSP BF535 Blackfin Processor Hardware Reference...
Page 360: ...Dynamic Power Management Controller 8 28 ADSP BF535 Blackfin Processor Hardware Reference...
Page 446: ...Beginning and Ending an SPI Transfer 10 40 ADSP BF535 Blackfin Processor Hardware Reference...
Page 522: ...Timing Examples 11 76 ADSP BF535 Blackfin Processor Hardware Reference...
Page 562: ...IrDA Support 12 40 ADSP BF535 Blackfin Processor Hardware Reference...
Page 608: ...PCI I O Issues 13 46 ADSP BF535 Blackfin Processor Hardware Reference...
Page 672: ...References 14 64 ADSP BF535 Blackfin Processor Hardware Reference...
Page 810: ...SDRAM Controller SDC 18 86 ADSP BF535 Blackfin Processor Hardware Reference...
Page 811: ...ADSP BF535 Blackfin Processor Hardware Reference 18 87 External Bus Interface Unit...
Page 812: ...SDRAM Controller SDC 18 88 ADSP BF535 Blackfin Processor Hardware Reference...
Page 860: ...DMA Bus Debug Registers 20 30 ADSP BF535 Blackfin Processor Hardware Reference...