jazio ™ incorporated jazio
DESCRIPTION
Digital Signal Switching Technology. JAZiO ™ Incorporated www.JAZiO.com. Agenda:. What is JAZiO? What’s Wrong with Traditional Methods of Signal Switching? The JAZiO Solution. What is JAZiO?. JAZiO, Inc is a small San Jose-based company that invents and licenses technology - PowerPoint PPT PresentationTRANSCRIPT
JAZiO™ Incorporated1
PlatformPlatform20002000
JAZiOJAZiO™™
IncorporatedIncorporatedwww.JAZiO.comwww.JAZiO.com
Digital Signal Switching Technology
JAZiO™ Incorporated2
PlatformPlatform20002000
Agenda:
• What is JAZiO?
• What’s Wrong with Traditional Methods of Signal Switching?
• The JAZiO Solution
JAZiO™ Incorporated3
PlatformPlatform20002000
What is JAZiO?• JAZiO, Inc is a small San Jose-based
company that invents and licenses technology
• The first technology offered is Digital Signal Switching
• This technology works with any user defined protocol, allowing complete product differentiation
JAZiO™ Incorporated4
PlatformPlatform20002000
Traditional Signal Driving
All information is transmitted during tRF
(1/3 of bit time)
The rest of the bit time is just wasted!
One bittime
Next bittime
tRF tSU tHD
Sharp Edges Cause:
Ground Bounce!Cross Talk!
Ringing!EMI!
High Power!
JAZiO™ Incorporated5
PlatformPlatform20002000
Traditional Signal Sensing
Single ended: Not suitable for high speed
Differential: Great!, but 2x the pins
Pseudo differential: A compromise
JAZiO™ Incorporated6
PlatformPlatform20002000
Pseudo Differential Signal SensingOne bit
timeNext bit
time
Sensing Level
VREFSwitching
Level 0.8V
Sensing level about1/3 of switching levelThe rest of the switching
level is just wasted!
Large switching levels cause:
Ground Bounce!Cross Talk!
Ringing!High Power!
JAZiO™ Incorporated7
PlatformPlatform20002000
Traditional Signal SwitchingResults in large, fast edges (high slew rate)
From Signal Integrity Corner, Be Afraid, Be Very Afraid By Eric Bogatin, www.bogatinenterprises.com
Why is this important????
• There are two kinds of designers, those that have signal integrity problems, and those that will
• It is predominantly the rise time that influences the magnitude of signal integrity problems in a system.
JAZiO™ Incorporated8
PlatformPlatform20002000
Why Does this Matter?• Moore’s law: Silicon technology doubles
every 18 months• Moron’s law: Non-silicon technology
doubles every 18 years• Therefore transmitting data between chips
(across motherboard, over cables, down backplane, etc) becomes the performance bottleneck of the entire system
JAZiO™ Incorporated9
PlatformPlatform20002000
What is Needed?• A system with edges that take most of the bit time• A system with small signal levels similar to true
differential sensing• A system with 1 pin per signal
How???
JAZiO™ Incorporated10
PlatformPlatform20002000
JAZiO Solution• JAZiO has invented a system which
– Achieves very high performance – Has edges which can take the whole bit time– Uses differential sensing with very low signal
levels– Yet has only 1 pin per data signal
JAZiO™ Incorporated11
PlatformPlatform20002000
What’s the Secret? A Re-think• For each data signal, there is either a change or no-
change from the previous bit time• Traditional systems are good on no-change but bad
on change• JAZiO looks for change first and then adjusts if no-
change occurs• For JAZiO the decision binary is change or no-
change rather than “high” or “low” relative to VREF
JAZiO™ Incorporated12
PlatformPlatform20002000
JAZiO Solution
SteeringLogic
DataOutput
VTR
DataInput
VTR
B
A Dual Comparators are used
In cases 1 and 6 Comparator A makes a differential comparisonIn cases 2 and 5 Comparator B makes a differential comparisonIn the other four cases Data Input does not change
Data is driven coincidentally with Voltage/Timing References
DataInput
VTR
VTR
One Bit Time
Provide alternating Voltage/Timing References switching at the data rate
Next Bit Time
8 different combinations of VTR and Data Input
712
3
4 8
56
JAZiO™ Incorporated13
PlatformPlatform20002000
Steering Logic
The trick is to know how to select between Comparators A and B and what to do when Data Input does not change
JAZiO™ Incorporated14
PlatformPlatform20002000
Steering Logic
• Generate Steering Logic signals (SL and SL)• Use them with Data Output from previous Bit
Time to select between Comparators A and B
SL
SL
DataOutput
XORin
inout
XORin
in
out
Data Input
VTR
VTR A
B
VTR
VTR
VTR
JAZiO™ Incorporated15
PlatformPlatform20002000
DataOutput
SL
Initializationor
Receiver Enable
SL
VTR
VTRDataInput
DataInput
XOR
XOR
55 Transistors Per Bit
JAZiO™ Incorporated16
PlatformPlatform20002000
Time Domain
Decision is made in the Time Domain rather voltage domain
VTR
DataInput
First Look forchange
Determine no-change and
switch toComparator B
0.5V
SL
SL
DataOutput
XORin
inout
XORin
in
out
Data Input
VTR
VTR A
B
VTR
VTR
VTR
JAZiO™ Incorporated17
PlatformPlatform20002000
AYes
JAZiO™ Receiver OperationA
Rail to Rail
Rail to Rail
0 1 1 0 0 1
SL
SL
XOR-B
DataOutput
in
in
in
inout
out
Data Input
VTR
VTR
B
VTR
VTR
VTR
XOR-A
Rail to Rail
DataInput
DataOutput
Initialize
VTRVTR
Comparator Selected
Change?
SL
SL
CompBCompA
XOR-A
XOR-B
YesB A
YesYes No No
Both Comparators have Signal in
No-change Case
JAZiO™ Incorporated18
PlatformPlatform20002000
The No-Change Case
But!The handoff from ComparatorA to B is smooth since both of them want to drive Data Outputhigh
After the handoff, Comparator Bis ready to make the nextdifferential comparison
Since Comparator A is selected itshigh value causes Data Output to remain high
DataOutput
XOR-B
in
in
in
inout
outXOR-A SL
SL
Comparator A is selected and as the differential on its inputs disappears the outputremains high temporarily
However, Comparator B is gaining a differential and itsOutput becomes a solid high
VTR
DataInput
VTR
B
A
(High)
Bit Time 3
But eventually the XORs will switchAnd Comparator B will be selected
JAZiO™ Incorporated19
PlatformPlatform20002000
18 JAZiO™ ReceiversD
ata
Inp
ut
0
Bit
s 1-
7
VT
RS
L
SL
VT
R
Dat
a O
utp
ut
0
SIG
NA
LS
FR
OM
P
AD
S
XO
R
XO
R
XO
R
XO
R XO
R
XO
R XO
R
XO
R
Dat
a In
pu
t 8
Dat
a In
pu
t 9
Dat
a In
pu
t 17
Dat
a O
utp
ut
8
Dat
a O
utp
ut
9
Dat
a O
utp
ut
17
Bit
s 10
-16
JAZiO™ Incorporated20
PlatformPlatform20002000
Performance
~5 bittimes
Same SlewRate
0.5VJAZiO
JAZiO is ~5 times faster
1/3 bittime
One bittime
0.8VTraditionalApproach
JAZiO™ Incorporated21
PlatformPlatform20002000
Power• JAZiO has lower switching levels and lower termination
voltage• Instead of 1.8 to 1.0V use 1.0 to 0.5V ~1/3 the Power• Slow edges Lower current, smaller drivers • Only one pin per signal is used• One transition per data bit• No encoding
JAZiO is ~1/3 the power
JAZiO™ Incorporated22
PlatformPlatform20002000
Robustness• JAZiO works best with slow edges (use the entire
Bit Time!)• JAZiO works with small transition levels
(differential sensing)• JAZiO is entirely common-mode• Works with any appropriate Termination Scheme
(Series, Parallel, Single, Dual, Source and even none in some applications)
JAZiO is very robust and easy to use
JAZiO™ Incorporated23
PlatformPlatform20002000
Data Rate vs Slew Rate Comparison
• Slower edges
• Lower switching levels
• Reduced slew rate
0.5 1.0 1.5 2.0 2.5 3.0 3.5
Slew Rate (V/nS)
Dat
a R
ate
per
Pin
(b
/S)
10M
100M
1G
10G
EDO-33
SDRAM-66
SDRAM-100 DDR
RDRAM
JAZiO™
JAZiO™
JAZiO™
Better
Higher Performance at Lower Power with Higher Robustness
JAZiO™ Incorporated24
PlatformPlatform20002000
Where Can JAZiO Be Used?• DRAM
• SRAM
• Front Side Bus
• Backplane
• Communications
• On-chip Bus
• Etc
JAZiO™ Incorporated25
PlatformPlatform20002000
How Can JAZiO Be Used?• JAZiO is “essentially” an Open Standard• All technology is publicly visible• Anyone can see it, study it, simulate it, design
it in, build test chips, build prototypes, etc• Just don’t sell products without licensing it• JAZiO is working with JEDEC/AMI2 and is
currently offering a license fee of $200K with royalty of 0.3% for DRAMs
JAZiO™ Incorporated26
PlatformPlatform20002000
Conclusion• JAZiO uses lower levels and slower edges• Achieves high performance, low power, high
robustness• JAZiO technology is fundamentally different
from traditional methods– Time domain rather than voltage domain– Look for change first– Change vs No-change rather than High or Low
• JAZiO is available to everyone at low cost and applies to any application