Sun Microsystems UltraSPARC-I User Manual page 349

UltraSPARC User's Manual
Table D-3 IEEE 1149.1 Instruction Encodings
Instruction
BYPASS
IDCODE
EXTEST
SAMPLE
INTEST
PLLMODE
CLKCTRL
RAMWCP
POWERCUT
HIGHZ
INTEST2
FULLSCAN
D.5.1 Public Instructions
D.5.1.1 BYPASS
Select the BYPASS register as the active test data register.
D.5.1.2 SAMPLE/PRELOAD
Selects the boundary scan register as the active test data register. This instruction
allows for the observing of the I/O pins or shifting in of a value to the boundary
scan chain without disturbing the normal processor operation.
D.5.1.3 EXTEST
Selects the boundary scan register as the active test data register. Used to perform
board level interconnect testing. When active the boundary scan chain drive the
processor pins. Therefore, UltraSPARC cannot operate in its normal functional
mode.
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IR encoding Scan Chain
FF bypass
16
FE id register
16
00 boundary
16
07 boundary
16
01 boundary
16
9F pll mode
16
9D clock control
16
BD ram control
16
8E N/A
16
FD bypass
16
8F boundary
16
40 ..7F internal
16 16