This document discusses programmable logic devices (PLDs) like field programmable gate arrays (FPGAs). It provides details on FPGA types and vendors like Xilinx. FPGAs offer efficient resource utilization and flexibility. Xilinx is a major FPGA vendor and the document describes Xilinx FPGA families and features. It also includes an example VHDL code for a half adder circuit implemented on an FPGA.

1. Programmable Logic Device
Saad Ahmed
BE (E)A
-FPGA

2. Types of PLD’s

3. FPGA
• A field-programmable gate array (FPGA) is an integrated circuit
designed to be configured by a designer after manufacturing.
• It contain programmable logic components called "logic blocks“.

4. Why FPGA…
• Efficient resources utilization
• Very high complexities possible
• Fast and efficient systems
• The low non-recurring engineering costs relative to an
ASIC design

5. Vendors
- Xilinx has traditionally been the FPGA leader.
Altera is the second FPGA heavyweight.
- Lattice Semiconductor focuses on low-cost, feature-
optimized FPGAs and non-volatile, flash-based FPGAs.
- Actel has antifuse and reprogrammable flash-based FPGAs.
- QuickLogic has antifuse (programmable-only-once)
products.
- Cypress Semiconductor

6. Xilinx
Xilinx is programmed to give you control. The company
is a top supplier of field-programmable gate arrays (FPGAs)
and complex programmable logic devices (CPLDs).

7. The Xilinx FPGA Families:
• Virtex Family: This family is advised for applications that demands
higher bandwidth and higher performance.
• Spartan Family: This family is advised for low cost, low power, and high
performance for cost-sensitive applications which will be used in high
amounts of productions.

8. • High Performance at different voltages
• Footprint Compatibility
- Devices within each family are compatible.
• Low power consumption/high performance
• Integrated Software
• Technology independence
- EDIF, VHDL, Verilog, SDF interfaces.
Xilinx FPGAs - Generic Features

9. • Silicon Family Name: Virtex II, Spartan II Core Architecture:
• Product Type: Programmer, In-Circuit
• Supply Voltage: 5.25V
• Synchronous Single and Dual-Port RAM
• Internal Three-state buffers.
• JTAG Boundary Scan
• System performance to 80 MHz
• 0.5 µ SRAM Process Technology
XC4000

10. Application (Half Adder On VHDL)
VHDL stands for VHSIC Hardware Definition Language where VHSIC
stands for Very High Speed Integrated Circuit.
VHDL can be used for two purposes:
•Synthesis
•Simulation

11. VHDL CODE
• library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
• entity HALF_ADDER is
Port ( A : in STD_LOGIC;
B : in STD_LOGIC;
SUM : out STD_LOGIC;
CARRY : out STD_LOGIC);
end HALF_ADDER;
• architecture Behavioral of HALF_ADDER is
begin
SUM <= A XOR B;
CARRY <= A AND B;
end Behavioral;