1149.6: why and how - · pdf file(c) agilent technologies, 2008 2 ken parker, senior...

1149.6: Why and How

Ken Parker

Boundary-Scan Users Group Meeting

December 2008

(c) Agilent Technologies, 2008 2

Ken Parker, Senior Scientist,Agilent Technologies, Loveland CO

[email protected]


Outline

1. Why 1149.6*?

2. How do you turn it on? (3070)

3. What happens then? (3070)

*1149.6, IEEE Standard for Boundary-Scan Testing of Advanced Digital Networks


Why 1149.6?

• Data transmission on boards is changing

– Before: clocked parallel data busses (slower)

– Now: serial busses with embedded clock (faster)

• Serialize/De-serialize (SERDES) technology

• On transmit side:

– Take parallel bits, encode into packet and send serially. (Encoding contains clocking)

• On receive side:

– Receive serial packet, decode into data and clock

• Uses differential signaling, and, AC coupling (!!)


Interconnect Standards

XAUI

On Chip

PCI 32/33 & 64/66

Chip-to-Chip Local Bus SystemBackplane

CoreConnect SCSI

USB

Serial ATA

IEEE 1394

1Gb Ethernet

CompactPCI

VME

PCI-X 66 & 100

POS-PHY L3/L4

XAUI

3GIO, PCI-Express 2.5Gb/s

RapidIO 3.125Gb/s

3.125Gb/s

Fibre-Channel

InfiniBand 2.5Gb/s

1.5HyperTransport 1.6Gb/s

2nd gen PCI-Express (5-6.25Gb/s)

6Gb/s SATA III

6.25Gb/s double XAUI

VXS Backplane (VITA41)

AdvancedTCA (PICMG 3.x)

GigE Backplane (VITA 31.1)

StarFabric Backplane(PICMG2.17)

Serial Mesh Backplane(PICMG2.20)VME320

1

2.5

2

3

5

6

10Gb Ethernet

CSIX

Flexbus 4

10

Gb/s


Why 1149.6?


– Before: clocked parallel data busses (slower)

IC 1

64-Bit Single-Ended Bidirectional Bus IC2

ClockDistribution& Deskew

Master Clock

CLK-1

CLK-2

CLK-3

IC3

CLK-3

CLK-2

CLK-1

Master Clock


Why 1149.6?



TX RX

TX CLK

Mis

sio

n L

og

ic

Mis

sio

n L

og

ic

8-B

it to

10-B

it

Pa

ralle

l-to

-Se

ria

l E

nco

de

r

Recovered Clock1

0-B

it t

o 8

-Bit

Se

ria

l-to

-Para

llel D

eco

der


Why 1149.6?



IC 1

IC2

CLK-1

CLK-2

CLK-3

IC3

8-Bit Serialized Differential Buses




CLK-2

CLK-3CLK-1


Why 1149.6?

• 1149.1 Boundary-Scan is a DC, Single-ended test

technology

– Not good at differential

– Cannot propagate signals through AC coupling

• Differential signaling is fault tolerant; hard defects

cause soft failures (like intermittent bit errors)

• 1149.6 addresses “Advanced I/O” with particular

emphasis on testing differential and AC coupling


Why 1149.6?

• AC Coupled Differential

– Load resistor RL

– Coupling Capacitors

– Bias setting network

VOL

VOH

VIL

VIH

VBias

RX

TXVCOM

C U

TX RX

C URL VBias

VOH

VCOM

VOL

TX

RX

VIH

VBIAS

VIL

RX

VBIASRL

TX


Outline

1. Why 1149.6?




How do you turn it on?

• 3070 Test Development

– Add 1149.1 enable statement to Config as before

– Add 1149.6 enable statement to Config(“enable 1149.6 Boundary Scan”)

– In board description, add 1149.1 keyword as you would for any Boundary-Scan board

– Supply BSDLs for all devices that have it

– Those that contain 1149.6 will be processed for 1149.6 testing, completely automatically


How do you turn it on?

• For 3070 testhead execution, get license

– Need “1149_6_Advanced_IO_Feature.lic”


Outline

1. Why 1149.6?




What happens then?

• Test Development

– Board compiler reads BSDL and processes 1149.6 information where it is found

– IPG examines board interconnects• Finds nail-to-1149.6 and 1149.1 paths (DC)

• Finds 1149.1 to 1149.1 interconnect (DC)



• Finds 1149.6 to 1149.6 interconnect (AC and DC)

– IPG Writes 1149.1 and 1149.6 tests• Interconnect, Buswire, Powered Shorts, Connect,

Shorted Capacitor


What happens then?

• Test Development

– What isn’t tested? (Deprecated by 1149.6)

• 1149.1 AC-coupled to 1149.6

• 1149.6 AC-coupled to 1149.1

• Nails AC-coupled to 1149.1

• Nails AC-coupled to 1149.6

– Still need nails in these cases

• consider VTEP to reduce nail count via drive-thru


What happens then?

• For 3070 testhead execution, runtime is fully

automatic

• New diagnostics

– Both legs of differential pairs

– Series components in paths indicated open or missing

– New “shorted capacitor” test


Questions ?


Just For Fun!!!!

Take the Poll at the right hand side of the

screen and be entered to win a lucky draw for

a $25 Amazon.com giftcard to be awarded

during this meeting….


And the Answer is…

What is the brand-name associated with

Agilent's Printed Circuit Board Test Portfolio?

Medalist

The Agilent Medalist PCBA Test and Inspection

family covers all your needs for solder paste

inspection, automated optical inspection,

automated X-ray inspection and in-circuit test.

1149.6: why and how - · pdf file(c) agilent technologies, 2008 2 ken parker, senior...

Documents