Buffer memory managing method and printing apparatus using the method
US6441917B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 16, 1996 |
| Grant date | Aug 27, 2002 |
| Priority date | — |
| Expiry date | Dec 16, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K2215/0011
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In a printing apparatus which performs printing operation in an emulation mode designated by a host computer, data necessary for the designated emulation mode is down-loaded. First, a fixed data buffer size is reserved in accordance with the emulation mode which requires the maximum amount of data to be down-loaded. Then, a ring buffer for receiving data is assigned next to the fixed data buffer. After the data size to be down loaded is determined, portions of area reserved for the fixed data buffer which becomes unnecessary is reassigned as print data buffer. Since the print data buffer is a ring buffer, if no received data is stored at an address which is at the border between the fixed data buffer and the print data buffer, it is possible to move the border. Therefore, the printing apparatus waits until a state of the print data buffer changes to a state in which no received data is stored at the address at the border, then expands the print data ring buffer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.