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Complex Programmable Logic Device (CPLD) Architecture and Its Applications

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A CPLD (complex programmable logic device) chip includes several circuit blocks on a single chip with inside wiring resources to attach the circuit blocks. Each circuit block is comparable to a PLA or a PAL. – PowerPoint PPT presentation

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Title: Complex Programmable Logic Device (CPLD) Architecture and Its Applications


1
Complex Programmable Logic Device (CPLD)
Architecture and Its Applications
2
Complex Programmable Logic Device (CPLD)
Architecture and Its Applications
Introduction
  • A CPLD (complex programmable logic device) chip
    includes several circuit blocks on a single chip
    with inside wiring resources to attach the
    circuit blocks. Each circuit block is comparable
    to a PLA or a PAL. These chips are inadequate to
    fairly modest sizes, normally supporting a mutual
    number of inputs and outputs of not more than 32.
    For designing of these circuits that need more
    inputs and outputs, either numerous PLAs/ PALs
    can be employed or else a more classy type of
    chip can be used called a CPLD

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3
Complex Programmable Logic Device (CPLD)
Architecture and Its Applications
What is a Complex Programmable Logic Device?
  • The acronym of the CPLD is Complex programmable
    logic devices.
  • it is a one kind of integrated circuit that
    application designers design to implement digital
    hardware like mobile phones. 
  • These can handle knowingly higher designs than
    SPLDs (simple programmable logic devices).
  • But It offer less logic than FPGAs (field
    programmable gate arrays).
  • CPLDs include numerous logic blocks.

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4
Complex Programmable Logic Device (CPLD)
Architecture and Its Applications
What is a Complex Programmable Logic Device?
  • Each of the blocks includes 8-16 macrocells.
  • Every logic block executes a specific function.
  • All of the macrocells in a logic block are fully
    connected.
  • Depending upon the use, these blocks may or may
    not be connected to one another.
  • Most CPLDs have macrocells with a sum of logic
    function and an elective flip-flop.

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5
Complex Programmable Logic Device (CPLD)
Architecture and Its Applications
What is a Complex Programmable Logic Device?
  • Depending on the chip, the combinatorial logic
    function supports from 4 to 16 product terms

http//www.elprocus.com/
6
Complex Programmable Logic Device (CPLD)
Architecture and Its Applications
What is a Complex Programmable Logic Device?
  • CPLDs also differ in terms of shift registers and
    logic gates.
  • Due to this reason, CPLDs with a huge number of
    logic gates may be used instead of FPGAs. 
  • Another CPLD specification signifies the number
    of product terms that a macrocell can accomplish.
  •  Product terms are the product of digital signals
    that execute a specific logic function.
  • CPLDs are available in several IC package forms
    and logic families. 

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7
Complex Programmable Logic Device (CPLD)
Architecture and Its Applications
What is a Complex Programmable Logic Device?
  • CPLDs also differ in terms of supply voltage,
    operating current, standby current and power
    dissipation.
  • These are obtainable with various amounts of
    memory and various kinds of memory support.
  • Memory is expressed in bits/ megabits.
  • Memory support consists of ROM, RAM and dual-port
    RAM.
  • It also comprises of CAM (content addressable
    memory) as well as FIFO (first-in, first-out)
    memory and LIFO (last-in, last-out) memory.

http//www.elprocus.com/
8
Complex Programmable Logic Device (CPLD)
Architecture and Its Applications
Architecture of Complex Programmable Logic Device
  • A complex programmable logic device comprises of
    a group of programmable FBs (functional blocks).
  • The inputs and outputs of these functional blocks
    are connected together by a GIM (global
    interconnection matrix).
  • This interconnection matrix is reconfigurable.
  • So that we can modify the contacts between the
    functional blocks.
  • There will be some input and output blocks that
    let us to unite CPLD to external world.

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9
Complex Programmable Logic Device (CPLD)
Architecture and Its Applications
Architecture of Complex Programmable Logic Device
  • The programmable FB looks like the array of logic
    gates

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10
Complex Programmable Logic Device (CPLD)
Architecture and Its Applications
Architecture of Complex Programmable Logic Device
  • In CPLD programming, the design is first coded in
    Verilog or VHDL language.
  • Once the code is (simulated and synthesized.
    During synthesis, the CPLD model (target device)
    is handpicked.
  • A technology based mapping net list is produced.
  • This list can be close-fitting to the genuine
    CPLD architecture using a place and route
    process.
  • It is achieved by the place-and-route software of
    CPLD Companys proprietary. 

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11
Complex Programmable Logic Device (CPLD)
Architecture and Its Applications
Architecture of Complex Programmable Logic Device
  • Then the operator will do some confirmation
    processes. 
  • If everything is good, he will utilize the CPLD,
    else he will rearrange it.

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12
Complex Programmable Logic Device (CPLD)
Architecture and Its Applications
Architecture Issues of CPLD
  • When considering a complex programmable logic
    device for use in design.
  • There is some following architecture issues can
    be taken into account.
  • The programming technology
  • The function block capability
  • The I/O capability

http//www.elprocus.com/
13
Complex Programmable Logic Device (CPLD)
Architecture and Its Applications
Architecture Issues of CPLD
  • Some of the families of CPLD from different
    retailers include
  • Altera MAX 7000 and MAX 9000 families
  • Atmel ATF and ATV families
  • Lattice isp LSI family
  • Lattice (Vantis) MACH family
  • Xilinx XC9500 family

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14
Complex Programmable Logic Device (CPLD)
Architecture and Its Applications
Architecture Issues of CPLD
Families of CPLD
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15
Complex Programmable Logic Device (CPLD)
Architecture and Its Applications
Applications of CPLD
  • Complex programmable logic devices are ideal for
    high performance, critical control applications.
  • CPLD can be used in digital designs to perform
    the functions of boot loader
  • CPLD is used for loading the configuration data
    of a field programmable gate array from
    non-volatile memory.
  • Generally, these are used in small design
    applications like address decoding

http//www.elprocus.com/
16
Complex Programmable Logic Device (CPLD)
Architecture and Its Applications
Applications of CPLD
  • CPLDs are frequently used many applications like
    in cost sensitive, battery operated portable
    devices due to its low size and usage of low
    power.

http//www.elprocus.com/
17
Complex Programmable Logic Device (CPLD)
Architecture and Its Applications
Conclusion
  • Thus, this is all about complex programmable
    logic device architecture and its applications. 
    Small digital circuits can be implemented by
    using PALs and PLAs. Each device is used to
    implement various circuits that do not need more
    than the number of i/ps, o/ps and product terms
    that are offered in the specific chip. 

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18
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