Chapter 8 Test Standards - NCU

Chapter 8Test Standards

Jin-Fu LiDepartment of Electrical EngineeringNational Central UniversityJungli, Taiwan

Advanced Reliable Systems (ARES) Lab. Jin-Fu Li, EE, NCU 2

1149.1 standard for system-on-board 1500 standard for system-on-chip

Outline

Overview System-on-Board System-on-Chip

1149.1

System-on-Chip

• Purpose of the standard Let test instructions and test data be serially

fed into a component-under-test (CUT) JTAG can operate at chip, PCB, & system

levels Let system interconnect be tested separately

from components Let components be tested separately from

1149.1 (JTAG) Standard

System Test Logic

Instruction Register Loading

System View of Interconnect

Boundary Scan Chain View

Elementary Boundary Scan Cell

Serial Board/MCM Scan

Parallel Board/MCM Scan

Independent Board/MCM Scan

• Test Access Port (TAP) includes these signals: Test Clock Input (TCK) -- Clock for test logic

Can run at different rate from system clock Test Mode Select (TMS) -- Switches system from

functional to test mode Test Data Input (TDI) -- Accepts serial test data and

instructions -- used to shift in vectors or one of many test instructions

Test Data Output (TDO) -- Serially shifts out test results captured in boundary scan chain (or device ID or other internal registers)

Test Reset (TRST) -- Optional asynchronous TAP controller reset

Signals of the TAP Controller

State Diagram of the TAP Controller

Load InstructionTest Application

Purpose: bypasses scan chain with 1-bit register

Mandatory Instruction – Bypass

Mandatory Instruction – Sample/Preload

Purpose: Get snapshot of normal chip output signals (Sample)

Mandatory Instruction – Sample/Preload

Purpose: Put data on boundary scan chain before next instruction (Preload)

Mandatory Instruction – Extest Purpose : Test off-chip circuits and board-level

interconnections

Mandatory Instruction – Intest Purpose :

Shifts external test patterns onto component External tester shifts component responses out

Advances in IC design methods and manufacturing technologies allow to integrate complete systems onto a single IC, called system on chip (SOC)

Compared with traditional multi-chip equivalents, SOC offers advantages such as Higher performance, lower power consumption, and

smaller volume and weight Many SOCs are designed by embedding large

reusable building blocks, called cores Design reuse speeds up the design and allows

import of external expertise

System On Chip

Design reuse becomes an indispensable condition to the design productivity optimization

The same is valid for efficient test of non-mergeable cores, because this would require test reuse

The test of these cores can become a challenge, with various types of difficulties including automation and test plug-and-play

A core-level solution to facilitate test integration and test reuse is required Standardization

Test Reuse

1500 Test Wrapper

Functional data

Test stimuli

Functional data

Test response

WSOWSI

WPI WPO

Source: Y. Zorian, et al.-JETTA2002

1500 Wrapper Component

Wrapper Instruction Register (WIR) Controls operation of Wrapper Controlled directly from WIP signals Instruction loaded via WSI-WSO

Wrapper Bypass Register (WBY) Mandatory bypass for serial TAM (between

WSI-WSO) Wrapper Boundary Register (WBR) Controllability/obervability on core terminals Test data loaded from WSI-WSO or WPI-WPO Built from library of wrapper cells

Wrapper Interface Ports [Y. Zorian, et al.,ITC03]

Wrapper

WSI WSO

WrapperParallel Input

WrapperParallel Output

WrapperParallel Control

WrapperSerial Input

WrapperSerial Control

WrapperSerial Output

Optional WrapperParallel Port (WPP)

Standardized Portfor Plug & Play

User Defined Portfor Test Flexibility

Required WrapperSerial Port (WSP)

Wrapper Interface Ports Functional I/Os

Core’s functional inputs/outputs

Wrapper Serial Control (WSC) A 7-bit control port for WIR and Wrapper

Wrapper Serial Port (WSP) Mandatory serial interface is used for two purposes

Wrapper control: loading instructions into the WIR Low-bandwidth test data access to WBR

Wrapper Parallel Control (WPC) User defined port for test flexibility

Wrapper Parallel Port (WPP) Optional parallel interface is used for test data access to

WBR with user-defined, scalable bandwidth

Wrapper Operation Modes

Core Normal Mode Core Test Mode (Internal test) Core Interconnection Test Mode (External

test) Core Isolation Mode

Wrapper Serial Control (WSC) WSC functions:

Control the operation of the WIR Control together with the WIR instruction the

operation of the wrapper

WRSTWCLK

SelectWRCapture

ShiftUpdate

Transfer

WSCControls& Clock

Wrapper

WSC Signals

SelectWR

Capture

Update

Transfer

“Wrapper clock”, dedicated P1500 clock signalfor WIR, WBY, and WBR

“Wrapper reset”, dedicated P1500 reset signalfor WIR

Select WIR as register between WSI-WSO

Enable shift operation for selected register

Enable capture operation for selected register

Enable update operation for selected register

Enable transfer operation for selected register

Serial Interface Layer (SIL) SIL architecture

CDR 1-N

Bypass

SelectWIR

Core DataRegisters

An Example of Wrapper Cell

SEshift

Shift Normal

Mode: Normal mode: normal=1Shift mode : shift=1

Controllability: normal=>value in SE is driven onto CFOObservability: shift=>value at CFO is captured into SE

Wrapper Instruction Set [Y. Zorian, et al.,JETTA02]

Wrapper in Normal Mode [Y. Zorian, et al.,JETTA02]

Scan chain 0

Scan chain 1

Coreq[0]

d[1]d[2]

d[3]d[4]

sc clk

WPI[2:0]WPO[2:0]

WSIWSO

SelectWIR

d[1]d[2]

d[3]d[4]

Wrapper

Wrapper in Bypass Mode [Y. Zorian, et al.,JETTA02]

Scan chain 0

Scan chain 1

Coreq[0]

d[1]d[2]

d[3]d[4]

sc clk

WPI[2:0]WPO[2:0]

WSIWSO

SelectWIR

d[1]d[2]

d[3]d[4]

Wrapper

Wrapper in WCoreTestS [Y. Zorian, et al.,JETTA02]

Scan chain 0

Scan chain 1

Coreq[0]

d[1]d[2]

d[3]d[4]

sc clk

WPI[2:0]WPO[2:0]

WSIWSO

SelectWIR

d[1]d[2]

d[3]d[4]

Wrapper

Wrapper in WExTestS [Y. Zorian, et al.,JETTA02]

Scan chain 0

Scan chain 1

Coreq[0]

d[1]d[2]

d[3]d[4]

sc clk

WPI[2:0]WPO[2:0]

WSIWSO

SelectWIR

d[1]d[2]

d[3]d[4]

Wrapper

Wrapper in WCoreTest [Y. Zorian, et al.,JETTA02]

Scan chain 0

Scan chain 1

Coreq[0]

d[1]d[2]

d[3]d[4]

sc clk

WPI[2:0]WPO[2:0]

WSIWSO

SelectWIR

d[1]d[2]

d[3]d[4]

Wrapper

Wrapper in WExTestP [Y. Zorian, et al.,JETTA02]

Scan chain 0

Scan chain 1

Coreq[0]

d[1]d[2]

d[3]d[4]

sc clk

WPI[2:0]WPO[2:0]

WSIWSO

SelectWIR

d[1]d[2]

d[3]d[4]

Wrapper

Chapter 8 Test Standards - NCU

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