By R.F.B.M. Dheere
Provides a survey of the newest advancements within the box of the common computing device interface, as a result of a examine of the realm patent literature. Illustrating the state-of-the-art this day, the e-book levels from uncomplicated interface constitution, via parameters and customary features, to an important business bus realizations. contemporary technical improvements also are incorporated, with detailed emphasis dedicated to the common interface adapter circuit. Comprehensively listed.
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Extra info for Universal Computer Interfaces
U OUTPUT i > l BUFFER REGISTER! 20 CONVERTERr ■ t ) ANALOG INPUT r " SAMPLE PULSE IN 0/A |CONVERTER| 7 ANALOG OUTPUT 2\ 30 As soon as the control unit (3) is ready for the I/O operations and the processing unit (1) executes an operation without the main memory (2), the processing unit (1) notifies the unit (3) over the vacant time signal line (25). The address selection signal line (30) inhibits the address information given from the central processing unit (1), and the I/O address signal line (29) is connected to the address bus (12).
In a single-cycle transfer, the data being transferred generally does not enter the DMA controller, but goes directly from the source to the destination. In contrast, since the data does enter the DMA controller for a two-cycle transfer, it is possible to act upon the data and do on-thefly operations during the transfer. For instance, the data can be translated before being sent to the destination. INTERFACE PARAMETERS 51 In the two-cycle transfer mode, data may also be transferred from one memory region to another, an impossibility with single-cycle transfer.
The reverse is true for reading data out of an 8-bit peripheral. This feature saves time and reduces the number of cycles needed for a given block of data; it is also useful when transferring data between memory in a 16-bitwide bus (for example, system bus) and that in an 8-bit-wide bus (for example, resident bus). In both the single-cycle and the two-cycle transfer modes, the data being transferred may be compared with a given pattern (mask-compare) and the DMA transfer optionally stopped either on encountering data of that pattern on or mismatch of data and pattern.
Universal Computer Interfaces by R.F.B.M. Dheere