The term "double buffered" is used in which of the following?

Correct option is B

The term double buffering is commonly associated with an asynchronous communication interface, where two buffers are used to handle data transfer between a sender and receiver operating independently. One buffer can hold data that has been received or is waiting for processing, while the other can be used for ongoing or subsequent data transfer. This arrangement helps prevent data loss when the processor cannot immediately service the communication interface. It also allows data reception and processing to overlap, improving communication efficiency.
Information Booster
1. Double Buffering
· Double buffering uses two separate storage buffers to temporarily hold data during communication or processing.
· While one buffer is being processed by the CPU, the other can receive the next block of data.
· This reduces the possibility of data being overwritten before it is processed.
2. Asynchronous Communication
· In asynchronous communication, the sender and receiver do not share a common clock for each transmitted bit.
· Data is generally transmitted using start and stop bits to identify the boundaries of a character or data unit.
· The receiver synchronizes with the incoming data using these framing bits.
3. Role of Buffers in Communication
· A buffer acts as a temporary storage area between two components operating at different speeds.
· In input communication, received data can be stored temporarily until the processor reads it.
· In output communication, data can be held until the communication interface is ready to transmit it.
4. Advantages of Double Buffering
· Reduces waiting time between data transfers.
· Allows overlapping of I/O and processing.
· Helps accommodate differences between processor and communication-device speeds.
· Can improve overall throughput in continuous data transfer.
5. Typical Applications
· Serial data reception.
· File and stream processing.
· Multimedia and graphics systems.
· Device I/O where continuous data flow needs temporary storage.
Additional Knowledge
· Option (a) Synchronous Communication Interface: Synchronous communication relies on a shared or coordinated clocking mechanism. Double buffering is not specifically what defines a synchronous interface.
· Option (c) Addressing Mode: Addressing modes specify how an instruction identifies or calculates the location of its operand, such as immediate, direct, indirect, or indexed addressing. Double buffering is unrelated to addressing modes.
· Option (d) Serial Communication: Serial communication refers broadly to transmitting data one bit at a time over a communication channel. Although buffering can be used in serial communication, the term double buffered in this question specifically refers to the buffering mechanism associated with the asynchronous communication interface.
· Key distinction: Asynchronous communication describes the timing mechanism, whereas double buffering describes a method of temporarily storing data to facilitate continuous or efficient transfer.