Sun Microelectronics
336
UltraSPARC User’s Manual
D.6.3 Boundary Scan Register
Allows for the testing of circuitry external to the device; for example, the inter-
connect (EXTEST), setting defined values at the device periphery (EXTEST), the
sampling and examination of the values at the pins without disturbing the sys-
tem (SAMPLE/PRELOAD), and the functional testing of the device itself (IN-
TEST).
The boundary scan register for UltraSPARC is 766 bits long. The mapping be-
tween register bits and the pin signals is described in a Boundary Scan Descrip-
tion Language (BSDL) file available from your SPARC sales representative.
Note: It is recommended that transitions from the Capture-DR TAP controller
state to the Shift-DR controller state take the route through the Exit1-DR,
Pause-DR, and Exit2-DR. It is not recommended to go directly from Capture-DR
to Shift-DR when the boundary scan register is selected.
D.6.4 Private Data Registers
Private data registers should not be accessed without first consulting your
SPARC sales representative.
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