LC4256V-5FT256BC

Series:	ispMACH® 4000V
Packaging:	Tray
Part Status:	Obsolete
Programmable Type:	In System Programmable
Delay Time tpd(1) Max:	5.0ns
Voltage Supply - Internal:	3 V ~ 3.6 V
Number of Logic Elements/Blocks:	16
Number of Macrocells:	256
Number of I/O:	160
Operating Temperature:	0°C ~ 90°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	256-LBGA
Supplier Device Package:	256-FTBGA (17x17)
Base Part Number:	LC4256

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Introduction

Embedded CPLDs are integrated circuits (ICs) used to fabricate complex digital logic systems, most often for the purpose of implementing logic functions. Embedded CPLDs may not contain as much logic as FPGAs, but their small size, low power consumption and low cost make them highly attractive for applications where low power and low resource requirements are paramount. One such device is the LC4256V-5FT256BC, a device developed by Lattice Semiconductor. In this article, we will explore the application field and working principles of this embedded CPLD device.

Application Field

The LC4256V-5FT256BC is designed to be used in a wide variety of embedded digital logic applications. It is typically used when the amount of logic required is too large to use discrete logic devices and too small to require an FPGA. Examples of applications include microcontroller-based embedded systems, digital signal processing, automotive control systems, medical systems, intelligent control systems, motor control and other industrial applications.The device provides a considerable amount of programmable logic which can be configured to implement complex logic functions. It has 256 macrocells, each of which contains one or more combinational logic elements and one or more flip-flops. The macrocell can be used to implement a programmable logic function, such as an AND, OR or XOR gate, or to design a finite state machine or a register file. The macrocell has a capability of up to 32 macrocells connected in cascade to provide an increased amount of logic flexibility and capability.

Working Principle

The LC4256V-5FT256BC utilizes a two-level architecture, a combination of Field Programmable Gate Arrays (FPGA) and Complex Programmable Logic Devices (CPLD). This architecture ensures that the device can flexibly be programmed to implement complex logic functions.The device operates in two steps. In the first step, the user programs the CPLD by specifying logic equations and circuit diagrams to define the desired logic functions. The CPLD compiles the user-specified logic into the device\'s internal design language, generating a netlist in the appropriate format for the second step.In the second step, the device\'s FPGA is used to verify the integrated design and map the design into the device\'s internal logic elements. When the design is verified, the FPGA will generate a set of commands that programs the device\'s internal logic elements to implement the user-specified logic functions.Once programmed, the device can be used to replace dozens of discrete logic ICs, providing a substantial saving in board space and power consumption. This makes the device suitable for a variety of embedded digital logic applications, from simple logic functions to complex systems that require integration of multiple digital logic elements.

Conclusion

The LC4256V-5FT256BC is an embedded CPLD device developed by Lattice Semiconductor. It is suitable for a wide range of digital logic applications, from simple logic functions to complex systems, and provides a considerable amount of programmable logic which can be configured to implement complex logic functions. It utilizes a two-level architecture, a combination of Field Programmable Gate Arrays (FPGA) and Complex Programmable Logic Devices (CPLD), and can be programmed to replace dozens of discrete logic ICs, providing a substantial saving in board space and power consumption.

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