Analog Devices ADSP-21261 SHARC Hardware Reference Manual page 287

No special values need to be written into any register prior to the selection
of any instruction. As
for emulator use. For more information, see
-
N 1
N
TDI
4
Figure 6-1. Serial Scan Path
Other registers, reserved for use by Analog Devices, exist. However, this
group of registers should not be accessed as they can cause damage to the
part.
ADSP-2126x SHARC Processor Hardware Reference
Table 6-2 shows, certain instructions are reserved
BOUNDARY REGISTER
-
N 2
BYPASS REGISTER
1
3
2
INSTRUCTION REGISTER
JTAG Test Emulation Port
Figure 6-1.
2
1
0
0
1
TDO
6-7