Complex Programmable Logic Device (CPLD) Architecture and Its Applications

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Complex Programmable Logic Device (CPLD)
Architecture and Its Applications
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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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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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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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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

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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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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.

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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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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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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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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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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

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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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Complex Programmable Logic Device (CPLD)
Architecture and Its Applications
Architecture Issues of CPLD
Families of CPLD
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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

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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.

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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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