This document discusses programmable logic devices (PLD) including their purpose, types, and structure. The main types of PLDs are SPLDs (simple PLDs like ROM, PLA, PAL, GAL), CPLDs (complex PLDs), and FPGAs (field-programmable gate arrays). SPLDs have an input connection matrix connecting inputs to AND gates and an output connection matrix connecting AND gates to OR gates. CPLDs and FPGAs can implement more complex designs than SPLDs and support thousands of gates versus hundreds for SPLDs. FPGAs contain many identical logic cells that can be programmed to implement different functions.
"Digital Systems Design" undergraduate course slides, By Dr. Reza Sameni, presented at Shiraz University, Shiraz, IRAN, Revision: June 2018, WEB: www.sameni.info, EMAIL: reza.sameni@gmail.com
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A review of the history of digital design throughout the years until the era of programmable logic, and a detailed exploration of the architecture of FPGA chips, followed by an introduction to SoC FPGAs and some of their benefits.
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2. PLD
• Problems by Using Basic Gates
• Many components on PCB:
– As no. of components rise, nodes interconnection
complexity grow exponentially
– Growth in interconnection will cause increase in
interference, PCB size, PCB design cost, and
manufacturing time
3. PLD
• The purpose of a PLD device is to permit elaborate digital logic
designs to be implemented by the user in a single device.
• Can be erased electrically and reprogrammed with a new design,
making them very well suited for academic and prototyping
• Types of Programmable Logic Devices
• SPLDs (Simple Programmable Logic Devices)
– ROM (Read-Only Memory)
– PLA (Programmable Logic Array)
– PAL (Programmable Array Logic)
– GAL (Generic Array Logic)
• CPLD (Complex Programmable Logic Device)
• FPGA (Field-Programmable Gate Array)
4. PLD
• The first three varieties are quite similar to each
other:
– They all have an input connection matrix, which connects
the inputs of the device to an array of AND-gates.
– They all have an output connection matrix, which connect
the outputs of the AND-gates to the inputs of OR-gates
which drive the outputs of the device.
• The gate array is significantly different and will be
described later.
5. PLD
• The differences between the first three categories
are these:
– 1. In a ROM, the input connection matrix is hardwired.
The user can modify the output connection matrix.
– In a PAL/GAL the output connection matrix is
hardwired. The user can modify the input connection
matrix.
– In a PLA the user can modify both the input connection
matrix and the output connection matrix.
15. An example of using a PAL device to realize two
Boolean functions. (a) Karnaugh maps. (b) Realization.
16. (a) Circuit diagram. (b) Symbolic representation.
Exclusive-or-gate with a
programmable fuse
17.
18.
19.
20.
21.
22. FPGA AND CPLD
1. FPGA - Field-Programmable Gate
Array.
2. CPLD - Complex Programmable Logic
Device
3. FPGA and CPLD is an advance PLD.
4. Support thousands of gate where as
PLD only support hundreds of gates.
23. What is an FPGA?
• Before the advent of programmable logic, custom logic circuits were built
at the board level using standard components, or at the gate level in
expensive application-specific (custom) integrated circuits.
• FPGA is an integrated circuit that contains many (64 to over 10,000)
identical logic cells that can be viewed as standard components. Each logic
cell can independently take on any one of a limited set of personalities.
• Individual cells are interconnected by a matrix of wires and programmable
switches. A user's design is implemented by specifying the simple logic
function for each cell and selectively closing the switches in the
interconnect matrix.
• Array of logic cells and interconnect form a fabric of basic building blocks
for logic circuits. Complex designs are created by combining these basic
blocks to create the desired circuit
25. What does a logic cell do?
• The logic cell architecture varies between different device families.
• Each logic cell combines a few binary inputs (typically between 3 and 10)
to one or two outputs according to a Boolean logic function specified in the
user program .
• In most families, the user also has the option of registering the
combinatorial output of the cell, so that clocked logic can be easily
implemented.
• Cell's combinatorial logic may be physically implemented as a small look-
up table memory (LUT) or as a set of multiplexers and gates.
• LUT devices tend to be a bit more flexible and provide more inputs per cell
than multiplexer cells at the expense of propagation delay.
26. what does 'Field Programmable' mean?
• Field Programmable means that the FPGA's function is defined by a user's
program rather than by the manufacturer of the device.
• A typical integrated circuit performs a particular function defined at the
time of manufacture. In contrast, the FPGA's function is defined by a
program written by someone other than the device manufacturer.
• Depending on the particular device, the program is either 'burned'
in permanently or semi-permanently as part of a board assembly process,
or is loaded from an external memory each time the device is powered up.
• This user programmability gives the user access to complex integrated
designs without the high engineering costs associated with application
specific integrated circuits.
27. How are FPGA programs created?
• Individually defining the many switch connections and cell logic functions
would be a daunting task.
• This task is handled by special software. The software translates a user's
schematic diagrams or textual hardware description language code then
places and routes the translated design.
• Most of the software packages have hooks to allow the user to influence
implementation, placement and routing to obtain better performance and
utilization of the device.
• Libraries of more complex function macros (eg. adders) further simplify
the design process by providing common circuits that are already optimized
for speed or area.
28. FPGA
FPGA applications:-
i. DSP
ii. Software-defined radio
iii. Aerospace
iv. Defense system
v. ASIC Prototyping
vi. Medical Imaging
vii. Computer vision
viii. Speech Recognition
ix. Cryptography
x. Bioinformatic
xi. And others.
29. CPLD
1. Complexity of CPLD is between FPGA and PLD.
2. CPLD featured in common PLD:-
i. Non-volatile configuration memory – does not need an external
configuration PROM.
ii. Routing constraints. Not for large and deeply layered logic.
3. CPLD featured in common FPGA:-
i. Large number of gates available.
ii. Can include complicated feedback path.
4. CPLD application:-
i. Address coding
ii. High performance control logic
iii. Complex finite state machines