Sequential Programmable Devices

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Presentation transcript:

Sequential Programmable Devices

Sequential Programmable Devices The combinational PLD consist only gates Sequential Programmable Devices includes both gates and filp-flop Type of sequential Programmable Devices: Sequential (simple) programmable logic device (SPLD) Complex programmable logic device (CPLD) Field programmable gate array (FPGA)

SPLD SPLD: consist PAL and D flip-flop Each section in SPLD is called Microcell

SPLD The basic microcell logic A typical SPLD has from 8 to 10 AND-OR array Edge-triggered D flip-flop Three-state buffer(inverter) A typical SPLD has from 8 to 10 macrocells within one IC package

CPLD CPLD is a collection of individual PLDs on a single integrated circuit Each PLD typically contains from 8 to 16 macroceIls CPLD has two levels of programmability: Each PLD block Interconnections between the PLDs Each I/0 pin is driven by a three state buffer and can be programmed to act as input or output

FPGA FPGA is a VLSI circuit that can be programmed at the user's location Consist of: hundreds or thousands of logic blocks Programmable interconnection programmable input and output blocks

Logic block Used to implement any boolean function Consist of: Look up table (LUTs) , Multiplexers , PLD blocks or NAND gates (implemented logic function) Multiplexers (select 1 of N inputs) Flip-flop, Registers. Clocked Storage elements.

Interconnection (Routing) FPGAs have 3 programmable routing resources : Vertical and horizontal routing channels Connection boxes connect input and output pins of the CLBs to wires of the vertical or the horizontal routing channels Switch boxes connect wire segments in the horizontal and vertical channels Technology of connection Static RAM Anti fuse EPROM EEPROM

I/O blocks They allow the pins of the FPGA chip to function either as input pins, output pins or input/output pins Programmable I/O

Circuit compilation

Major FPGA Vendors SRAM-based FPGAs Flash & antifuse FPGAs Xilinx, Inc. Altera Corp. Atmel Lattice Semiconductor Flash & antifuse FPGAs Actel Corp. Quick Logic Corp.

Altera DE2-70