PM7347 datasheet(292/341 Pages) PMC

292 / 341 page

S/UNI®-JET Data Sheet

Released

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use

292

Document ID: PMC-1990267, Issue 3

The following is an description of the standard instructions. Each instruction selects an serial test

data register path between input, TDI and output, TDO.

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

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 device inputs and outputs 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.

IDCODE

The identification instruction is used to connect the identification register between TDI and TDO.

The device's identification code can then be shifted out using the Shift-DR state.

STCTEST

The single transport chain instruction is used to test out the TAP controller and the boundary scan

identification code is loaded into the boundary scan register. The code can then be shifted out

output, TDO using the Shift-DR state.

Boundary Scan Cell Description

In the following diagrams, CLOCK-DR is equal to TCK when the current controller state is

SHIFT-DR or CAPTURE-DR, and unchanging otherwise. The multiplexer in the center of the

diagram selects one of four inputs, depending on the status of select lines G1 and G2. The ID

Code bit is as listed in the Boundary Scan Register table located in the TEST FEATURES

DESCRIPTION - JTAG Test Port section.

PM7347 Datasheet(PDF) 292 Page - PMC-Sierra, Inc