What is meant by CPLD?

What is meant by CPLD?

A Complex Programmable Logic Device (CPLD) is a combination of a fully programmable AND/OR array and a bank of macrocells. The AND/OR array is reprogrammable and can perform a multitude of logic functions.

What is Server CPLD?

The CPLD consists of three parts: logic block, programmable interconnect channel, and I/O block. Simply put, The function of CPLD is to enable the server to work properly with external I/O modules, such as keyboards, monitors, and mice.

What is difference between FPGA and CPLD?

Definition. CPLD is an integrated circuit that helps to implement digital systems whereas FPGA is an integrated circuit designed to be configured by a customer or a designer after manufacturing. These definitions explain the main difference between CPLD and FPGA.

What is CPLD in VLSI?

A complex programmable logic device (CPLD) is a programmable logic device with complexity between that of PALs and FPGAs, and architectural features of both. The main building block of the CPLD is a macrocell, which contains logic implementing disjunctive normal form expressions and more specialized logic operations.

How does a CPLD work?

A CPLD contains a bunch of PLD blocks whose inputs and outputs are connected together by a global interconnection matrix. So a CPLD has two levels of programmability: each PLD block can be programmed, and then the interconnections between the PLDs can be programmed.

How is CPLD programmed?

The tools used to program a CPLD are very similar to those used to program an In-System Programmable (ISP) microcontroller. The logic circuit is written in a text editor or IDE using a hardware description language. The text file program is then converted to a format that can be loaded into the CPLD.


PLDs can broadly be categorised into, in increasing order of complexity, Simple Programmable Logic Devices (SPLDs), comprising programmable array logic, programmable logic array and generic array logic; Complex Programmable Logic Devices (CPLDs) and Field-Programmable Gate Arrays (FPGAs).

Why is CPLD used?

CPLDs can be used as bootloaders for FPGAs and other programmable systems. CPLDs are often used as address decoders and custom state machines in digital systems. Due to their small size and low power consumption, CPLDs are ideal for use in portable and handheld digital devices.

Why do we need CPLD?

CPLDs are cheap and it also offers a much faster input to output duration because of its simpler, ‘coarse grain’ architecture. FPGAs are cheaper per gate but expensive when it comes to package. Working with FPGAs requires special procedures as it is RAM-based.

What is PLD and CPLD?

Does CPLD have memory?

CPLD does not require an external configuration memory and can start operating immediately after the system has been booted up. It is a type of non-volatile configuration memory. They employ the use of Electrically Erasable Programmable Read-Only Memory (EEPROM).

Is CPLD programmable?

CPLDs are programmable using an electrically erasable programmable read-only memory (EEPROM), so their configuration is stored in non-volatile memory and can be accessed even after a reboot.

What are the features of CPLD?

What are the features of CPLD?

  • High performance.
  • Large density range.
  • Slew rate control on each individual output.
  • Flexible 36 Vs 18 functional blocks.
  • High drive 24mA outputs.
  • User-programmable ground pin capability.
  • Non-volatile configuration memory.

What is the difference between VHDL and CPLD?

A final point is that when a VHDL model is translated into the “gates and wires” that are mapped onto a programmable logic device such as a CPLD or FPGA, then it is the actual hardware being configured, rather than the VHDL code being “executed” as if on some form of a processor chip.

What is a CPLD?

The concept of CPLDs is to have a few macrocells on a single chip with simple logic paths. CPLDs are classified depending upon the architecture which gives rise to high speed, detailed timing and simple software flow.

What is a VHDL project?

A VHDL project is multipurpose. Being created once, a calculation block can be used in many other projects. However, many formational and functional block parameters can be tuned (capacity parameters, memory size, element base, block composition and interconnection structure).

What is the difference between SPLDs and CPLDs?

CPLDs are based on EPROM or EEPROM technology. CPLDs are having extended density than the SPLDs. The concept of CPLDs is to have a few macrocells on a single chip with simple logic paths. CPLDs are classified depending upon the architecture which gives rise to high speed, detailed timing and simple software flow.