Interface apparatus and method, and image output apparatus having interface apparatus
US6499069B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 21, 2000 |
| Grant date | Dec 24, 2002 |
| Priority date | — |
| Expiry date | May 29, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/4072
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An interface apparatus capable of appropriate connection with external devices having various specifications. Control signal DRVSEL is used for setting output method of a signal from output circuit 801 to an open-collector drive or a totem-pole drive. 3-State buffer 904 which drives a communication path comes into high-impedance status when its enable input is at a H level, on the other hand, when the enable input is at a L level, drives its output with the same logic as that of AND gate output. When the signal DRVSEL is at the L level, the 3-state buffer 904 drives the output only when its internal signal is at the L level, thus output is made in the open-collector drive. On the other hand, when the signal DRVSEL is at the H level, the 3-state buffer 904 drives the output with the same logic as that of its internal signal, thus output is made in the totem-pole drive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.