Define a digital decoder and its application in address decoding.
1 Answer
A digital decoder is a combinational logic circuit that takes an input code and converts it into an output signal on one of multiple output lines. The decoder essentially "decodes" the input code to activate a specific output line corresponding to the given input.
The most common type of digital decoder is the binary decoder, which converts a binary input code into an output signal on one of its output lines. Binary decoders come in various configurations, such as 2-to-4, 3-to-8, and 4-to-16, depending on the number of input bits and output lines.
Application in Address Decoding:
In digital systems, address decoding is a crucial process used to select specific memory or peripheral devices connected to the system bus. It allows the system to determine which device should respond to the address provided by the CPU or controller. Digital decoders play a vital role in address decoding, as they help enable or activate the appropriate memory or peripheral device based on the address signals.
Let's take a simple example of a 3-to-8 binary decoder used in address decoding. In this case, the decoder takes a 3-bit binary input code and activates one of the eight output lines. Each output line corresponds to a specific memory chip or peripheral device in the system.
For instance, suppose the input code is 101 (in binary), which represents decimal 5. The 3-to-8 decoder will activate the 5th output line (counting from 0), and the corresponding memory chip or peripheral device associated with that line will be selected. All other output lines will remain inactive.
Address decoding using digital decoders is crucial in computer systems, microcontrollers, memory interfacing, input/output (I/O) devices, and other digital circuits where multiple devices need to be accessed or controlled based on unique addresses. It enables efficient and reliable communication between the CPU/controller and various peripheral devices in the system.
The most common type of digital decoder is the binary decoder, which converts a binary input code into an output signal on one of its output lines. Binary decoders come in various configurations, such as 2-to-4, 3-to-8, and 4-to-16, depending on the number of input bits and output lines.
Application in Address Decoding:
In digital systems, address decoding is a crucial process used to select specific memory or peripheral devices connected to the system bus. It allows the system to determine which device should respond to the address provided by the CPU or controller. Digital decoders play a vital role in address decoding, as they help enable or activate the appropriate memory or peripheral device based on the address signals.
Let's take a simple example of a 3-to-8 binary decoder used in address decoding. In this case, the decoder takes a 3-bit binary input code and activates one of the eight output lines. Each output line corresponds to a specific memory chip or peripheral device in the system.
For instance, suppose the input code is 101 (in binary), which represents decimal 5. The 3-to-8 decoder will activate the 5th output line (counting from 0), and the corresponding memory chip or peripheral device associated with that line will be selected. All other output lines will remain inactive.
Address decoding using digital decoders is crucial in computer systems, microcontrollers, memory interfacing, input/output (I/O) devices, and other digital circuits where multiple devices need to be accessed or controlled based on unique addresses. It enables efficient and reliable communication between the CPU/controller and various peripheral devices in the system.