Random access memory having a second input/output port
US4541075A · kind A · utility
59Cited by
2References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 30, 1982 |
| Grant date | Sep 10, 1985 |
| Priority date | — |
| Expiry date | Jun 30, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2360/126
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A semiconductor random access memory is provided having a second asynchronous input/output port. Block transfers of data can be effected to and from the memory using the second input/output port. Memory throughput efficiency is improved permitting functions such as display refresh in a mapped memory display to be accomplished through the second input/output port. Memory bus contention on the primary port is also relieved. The main input/output port is thereby free to receive new data for a higher percentage of available transfer time since refresh data is available at the second input/output port.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.