ID protected memory with a readable/writable ID template
US5297268A · kind A · utility
47Cited by
4References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 4, 1990 |
| Grant date | Mar 22, 1994 |
| Priority date | — |
| Expiry date | Dec 4, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F12/1466
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A CPU (28) accesses remotely disposed RAM (12) through a common serial data link. The RAM is interfaced to the common data link under the control of an arbiter circuit (10). The arbiter includes a protocol shift register (31) for receiving control information, ID information, and address information for the RAM. The incoming ID information is compared with an ID template (37), and: PA1 If a match IS present: PA2 Read/Write access to the RAM is allowed, and PA2 Read/Write access to the ID template is allowed; PA1 If a match is NOT present: PA2 NO access to the RAM is allowed, PA2 Read-Only access to the ID template is allowed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.