Direct memory read and cell transmission apparatus for ATM cell segmentation system
US6275504A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Aug 24, 1998 |
| Grant date | Aug 14, 2001 |
| Priority date | — |
| Expiry date | Aug 24, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2012/5674
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A direct memory read and cell transmission apparatus for an ATM cell segmentation system having a host CPU is disclosed. The segmentation circuit of the apparatus transfers the address and size for the start of the DMA by the byte unit. When a predetermined information is provided, and a DMA read is requested, the data is transferred through the bus of the word unit such as the PCI interface, and then necessary bytes are obtained for thereby forming a 32 bit word stream, so that the ATM cell of a 32 bit.times.12 word form and transfers to the lower circuit. Therefore, when the segmentation circuit processes the buffer, all data are computed by the byte unit, and in an application program, the data are not obtained for transmitting the data to the ATM cell, so that it is possible to enhance the processing capability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.