Data transfer control device, electronic equipment, and data transfer control method
US6901465B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 2002 |
| Grant date | May 31, 2005 |
| Priority date | — |
| Expiry date | Jun 20, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/4027
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A data transfer control device using USB (a first bus), the end of a data phase (data transport: transfer of all the data) during an OUT transaction is determined on condition that data transmission (DMA transfer) through EBUS (a second bus) has ended, and the end of a data phase during an IN transaction is determined on condition that data reception through EBUS has ended and also an Empty signal has gone active, indicating that a data storage area has become empty. A counter that counts the data size is provided on the EBUS side. If data reception through EBUS ends and the size of data remaining in the data storage area is less than the maximum packet size, a short packet in the data storage area is transmitted automatically through USB and an interrupt is used to notify the firmware of the presence of the short packet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.