Master/slave buses are usually synchronous, as the master often supplies the timing clock for data being sent along in both directions. Master/slave describes a bus where one device is the master and others are slaves.Half-duplex is when data can be sent or received, but not at the same time. Full-duplex means data can be sent and received simultaneously.A synchronous bus sends data with a timing clock. On an asynchronous bus, data is sent without a timing clock.However, with many 8-bit microcontrollers (let alone 8-pin) with no external address/data bus available for designs, memory-mapping is not an option.īefore we get into the individual interface details, we should define several terms: This tendency allows parallel access to off-chip peripherals. “Memory-mapping” peripherals has been a technique commonly used for systems with address and data buses. ![]() For operational fetches, address and data buses, and other microprogram control, parallel buses have always been the clear winner. Now there is surety that destination has read the data from the data bus through data accepted signal.This isn’t to say that parallel buses have no use. (iv) Disable Data accepted signal and the process ends. (iii) After this, disable Data valid signal means data on data bus is invalid now. (ii) Destination accepts data from the data bus and enable Data accepted signal. (i) Source places data on the data bus and enable Data valid signal. DATA ACCEPTED: if ON tells data is accepted otherwise not accepted. It consists of signals: DATA VALID: if ON tells data on the data bus is valid otherwise invalid.
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