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Bit-Sliced Microprocessor Architecture Disclosure Number: IPCOM000131322D
Original Publication Date: 1978-Jun-01
Included in the Prior Art Database: 2005-Nov-10
Document File: 24 page(s) / 80K

Publishing Venue

Software Patent Institute

Related People

Nikitas A. Alexandridis: AUTHOR [+3]


With the high speed of bipolar technology and the flexibility of usermicroprogrammability, bit-sliced microprocessors are finding a place in critical applications.

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Bit-Sliced Microprocessor Architecture

Nikitas A. Alexandridis University of Patras

With the high speed of bipolar technology and the flexibility of usermicroprogrammability, bit- sliced microprocessors are finding a place in critical applications.

The appearance of microprocessors and microcomputers in the beginning of this decade gave a new dimension to the designers and builders of digital machines. This resulted in the development of new digital systems which included and functioned with microprocessors, i.e., microprocessorbased systems. This technology widened the application spectrum because these new LSI devices were cheaper, smaller, required less power, and permitted much more flexible design.

A microprocessor, which is (usually) an integrated chip, corresponds to the CPU of a digital computer. This microprocessor -- along with some random access memory for the storage of data and intermediate results, some programmable read only memory to hold the instructions, a power supply, and the necessary interfacing circuitry for the I/O and communication with peripheral devices -- makes a microcomputer.

This microcomputer satisfies all minimum requirements of a computer -- it can receive data and give data in the form of digital signals, it contains a data processing unit and the appropriate controls to carry out operations, it contains a minimum of some kind of memory (RAM, PROM, etc.) for the storage of data and instructions, it is user-programmable, and it is quite fast, with the ability to execute an instruction in less than 10 us. Conventional microprocessors are manufactured using MOS technology, and their most common implementation places both the data processing function and the control function on one chip.

Single-chip microprocessors have been popular for the past few years and have been used in a continuously increasing number of new applications. Because of their extremely small size and low cost, these programmable devices have brought about a revolution in digital systems, replacing conventional hardwired or random logic with programmable logic. This eliminates a number of SSI and MSI packages and interconnections, reduces power requirements, and increases system reliability. The major drawback of the MOS-based devices is their relatively slow speed, which restricts them to applications that do not require high execution rates.

Compared to single-chip MOS microprocessors, bit-sliced microprocessors, manufactured with bipolar technology, provide the final digital system with much more flexibility...