digital consumer roadshow 2004: 7400 logic replacement
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Digital Consumer Roadshow 2004: 7400 Logic Replacement. The 7400 Series – A Brief History -. 1960s space program drove development of 7400 series Consumed all available devices for internal flight computer $1000 / device (1960 dollars) 10:1 integration improvement over discrete transistors - PowerPoint PPT PresentationTRANSCRIPT
Digital Consumer Roadshow 2004:
7400 Logic Replacement
The 7400 Series – A Brief History -
• 1960s space program drove development of 7400 series
― Consumed all available devices for internal flight computer
― $1000 / device (1960 dollars)― 10:1 integration improvement over
discrete transistors• 1963 Minuteman missile forced 7400
into mass production― Drove pricing down to $25 / circuit
(1963 dollars)
Success Drives Proliferation
• New families introduced based on ― Higher performance― Lower power― New features― New signaling threshold
19602003
• Spawned over 32 unique families!
Too Much of a Good Thing?
• Families• Packages• Reliability options• Speed grades• Features• Functions
An availability nightmare! >> 500K unique devices
Different Families Don’t all Speak the Same Language
Sometimes Things Get Lost or Added in the Translation*
Different families aren’t always on speaking terms with one another
High Performance3.5ns tPD, fmax 303Mhz
Improved features
Low Cost0.18µ = small die size
Lowest cost packaging
Lowest Power12mW*
~20uA typical stand-by
Storage Systems, Routers Set-Top Box, Cell phone Handheld, Portable Equipment
The Ultimate Solution For 7400 Logic Replacement
Eliminate Availability & Obsolescence Issues
• Over >> 500,000 different 7400 devices addressed in one package!― Nothing needs to get “lost or added in the translation”
• AND Additional features for free― EMI management, system clocking, reprogrammability,
design security….
Driving Down Costs Through Process Technology
Feat
ure
Size
(mic
ron)
0.35
0.25
0.18
0.13
0.10
0.071999 2000 2001 2002 2003 2004
CPLDs
CPLD Vs. Discrete 7400 Total Product Cost
CPLD1985
Discrete CPLD2003
Discrete
Die Cost Test Cost Package Cost
1000 % Reduction in die cost throughsemiconductor process technology
CPLD2003
Discrete
Die Cost Test Cost Package Cost
Equivalent to > 8Discrete TTL Devices
8
• More:― Logic― Features― Performance― Security― Flexibility
• For Less― Price― Board Area― Power― EMI
Xilinx CPLDs Offer More for Less
These are the fundamentals behind the death of the 7400 series…
The CPLD Cost Advantage
CPLD Price Advantage
Device Cost Comparison 7400 vs. CPLD
Cost Advantage Case Study- PVR -
ICs Inside the Box
Clock
DiscreteLogic
µP control
Buffers/Drivers
Peripheral
BOM Analysis
Buffers/
Drivers
Discrete Logic
Watchdog Timer
Peripheral - UART
Low Power, Low Cost
Additional Logic, IO and
System Resources
Discrete components cost: $5.73XC2C128 - $4.60Saved: $1.13
7400 Replacement Solution
Save $1.13
Reducing the Overall BOMSo
lutio
n C
ost
$0.91
Standard Solutions
Discrete Logic Chips $0.91*
Watchdog Timer $1.05*
Coolrunner-II Solution
$4.60
UART $2.20*
Buffers / Drivers
$2.57*
$1.96
$3.16
$5.73
XC2C128VQ100C
250KU Pricing
* High-volume pricing estimate
Additional features using
Programmable Logic for FREE !!
Additional features using
Programmable Logic for FREE !!Re-programmability
Performance
Power Savings
Additional Logic
Time-to-market
Board Area
Additional Memory
Additional I/O
Cost Advantage Case StudyInstrumentation
(1) (2)(2)(2) (2)(1)
Cost Advantage Case StudyGPS PDA
(4)
(1)
(1)
(1)
CoolRunner-II Changes the Equation
• Lower cost, higher integration than 7400 TTL• Additional features that manage real world issues
― EMI ― System clocking ― Design security― Obsolescence / availability ― Reduced test costs― External interfacing components eliminated ― In field bug fixes, upgrades, changes
Managing EMI CoolRunner-II Benefits
• Typically considered “black magic”• Significant TTM impact to achieve compliance
― Board spins, test time etc.
• CoolRunner-II features and integration benefits address EMI
― Programmable drive strength, I/O signaling, programmable ground, programmable slew rate, PLLs
CoolRunner-IIDesign Security
• 7400 series has no inherent means to thwart reverse engineering
― Remove device marking?• CoolRunner-II
― Programmable bit stream security― Prevents both over-writing or readback― Four levels of on-chip-security― Tampering causes device to
automatically lock down
Reduced Test Costs
• CPLD integration reduces “bed of nails” test time ― Reduced points to interrogate
• Reduced device count significantly increases FITs― Mis-aligned / wrong part placement― Soldering failure
• CoolRunner-II JTAG test port – “free” allows for PCB testing― Inherent programmability provides 100% test coverage
CoolRunner-IISimplified Interfacing
• Additional components for interfacing disparate 7400 logic families ― Pull up resistors etc.
• Additional components typically required to communicate with interface logic― Bus transceivers, high performance memory interfaces, slow slew rate
signaling• CoolRunner-II programmable I/O eliminates need for external
interface devices― Programmable HSTL, SSTL, Schmitt Trigger etc.― Considerable board area and cost savings!
The Ultimate Advantage- Reprogrammability -
• CoolRunner-II CPLDs can be programmed at any phase of product life-cycle― Prototyping, field trials, and in market
The World of TTL
Logic Cell Estimation Errors
X X
X
XXX
X
1 Macrocell Utilized vs. Four
• Unused Gates in Package• Synthesized to 1 Macrocell
Unused Logic Device Functionality
Logic Cell Estimator Guarantees that Results will be as Good or Better than Estimated Savings Value