PM7344 datasheet(262/293 Pages) PMC

262 / 293 page

PM7344 S/UNI-MPH

DATA SHEET

PMC-950449

ISSUE 6

MULTI-PHY USER NETWORK INTERFACE

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

246

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.

Table 5

- Instruction Register

Length - 3 bits

Instructions

Selected Register

Boundary Scan

Instruction Codes (IR[2:0])

EXTEST

000

IDCODE

Identification

001

SAMPLE

Boundary Scan

010

BYPASS

Bypass

011

BYPASS

Bypass

100

STCTEST

Boundary Scan

101

BYPASS

Bypass

110

BYPASS

Bypass

111

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

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