US 7,454,540 B2Granted

Data transferring system and electronic apparatus

AssigneeRicoh Company, Ltd.

InventorsKoji Oshikiri, Junichi Ikeda, Koji Takeo, Noriyuki Terao

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Abstract

A data transferring system based on the PCI Express standard in which power saving is realized is disclosed. In the data transferring system, a data transferring device transfers image data based on the PCI Express standard by synchronizing with a line synchronizing signal LSYNC. At this time, the data transferring device causes a period between packets (image data) to be transferred in one line cycle of the line synchronizing signal LSYNC to be shorter than a transition period “t1” which is required to transit from a link state L0 to a link state L0s and from the link state L0s to the link state L0. With this, the number of the transition periods “t1” is reduced and the period of the link state L0s is made long.

Claims6

Dependent claims

A data transferring system that transfers image data based on the PCI Express standard by synchronizing with a line synchronizing signal or a frame synchronizing signal, comprising:

a first packet gathering unit configured to transfer first image data packets by causing a period between the first packets to be transferred in one cycle of the synchronizing signal to be shorter than a time that is required to transit from a link state L0 to a link state L0s and from the link state L0s to the link state L0;
a second packet gathering unit configured to transfer second image data packets by causing a period between the second packets to be transferred in one cycle of the synchronizing signal to be shorter than the time that is required to transit from the link state L0 to the link state L0s and from the link state L0s to the link state L0;
and
a delay controlling unit configured to control a delay between a last packet transferred by the first packet gathering unit and a first packet transferred by the second packet gathering unit to be shorter than the time that is required to transit from the link state L0 to the link state L0s.

1 more element

Dependencies are inferred from the claim text.