Multimode memory system using a multiword common bus for double word and single word transfer
US4361869A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 8, 1980 |
| Grant date | Nov 30, 1982 |
| Priority date | — |
| Expiry date | Jan 8, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/1678
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A memory subsystem couples to a double wide word bus in common with a number of central processing units for processing memory requests received therefrom. The subsystem includes at least a pair of independently addressable dynamic memory module units. Each memory unit includes a number of rows of random access memory (RAM) chips. The subsystem further includes common control circuits, timing circuits and common addressing circuits. The addressing circuits which couple to both module units provide the required address signals to both modules for enabling the simultaneous access of a pair of words therefrom into a pair of data registers. The outputs of the data registers couple to the inputs of a pair of output multiplexer circuits. The outputs of the multiplexer circuits are connected to provide double wide output to the double wide word bus. The timing circuits generate a sequence of timing signals for access and read out of the pair of words into the data registers for simultaneous transfer via the multiplexer circuits to the double wide bus. The control circuits which in response to each memory request specifying a double fetch operation, condition the multiplexer circuits and m…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.