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S/UNI-QUAD
PMC-Sierra, Inc.
PM5349 S/UNI-QUAD
DATASHEET
PMC-971239 ISSUE 6 SATURN USER NETWORK INTERFACE (155-QUAD)
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
216
Shift-IR
The shift instruction register state is used to shift both the instruction register and
the selected test data registers by one stage. Shifting is from MSB to LSB and
occurs on the rising edge of TCK.
Update-IR
The update instruction register state is used to load a new instruction into the
instruction register. The new instruction must be scanned in using the Shift-IR
state. The load occurs on the falling edge of TCK.
The Pause-DR and Pause-IR states are provided to allow shifting through the
test data and/or instruction registers to be momentarily paused.
Boundary Scan Instructions
The following is an description of the standard instructions. Each instruction
selects an serial test data register path between input, TDI and output, TDO.
13.6.1.2
Instructions
BYPASS
The bypass instruction shifts data from input, TDI to output, TDO with one TCK
clock period delay. The instruction is used to bypass the device.
EXTEST
The external test instruction allows testing of the interconnection to other devices.
When the current instruction is the EXTEST instruction, the boundary scan
register is place between input, TDI and output, TDO. Primary device inputs can
be sampled by loading the boundary scan register using the Capture-DR state.
The sampled values can then be viewed by shifting the boundary scan register
using the Shift-DR state. Primary device outputs can be controlled by loading
patterns shifted in through input TDI into the boundary scan register using the
Update-DR state.
SAMPLE
The sample instruction samples all the device inputs and outputs. For this
instruction, the boundary scan register is placed between TDI and TDO. Primary