PM5347 datasheet(249/302 Pages) PMC

249 / 302 page

PM5347 S/UNI-PLUS

DATA SHEET

PMC-941033

ISSUE 6

SATURN USER NETWORK INTERFACE PLUS

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

233

The TDO output is enabled during states Shift-DR and Shift-

IR. Otherwise, it is tri-stated.

Boundary Scan Instructions

The following is a 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

device inputs can be sampled by loading the boundary scan

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 device inputs and

outputs can be sampled by loading the boundary scan

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 register during

production test. When this instruction is the current

instruction, the boundary scan register is connected

between TDI and TDO. During the Capture-DR state, the

device identification code is loaded into the boundary scan

PM5347 Datasheet(PDF) 249 Page - PMC-Sierra, Inc

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