US 6,748,444 B1Granted

Transmission system of short time lag

AssigneeMitsubishi Denki Kabushiki Kaisha

InventorMasaru Nagashima

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Abstract

A delay time period, such as the H/W process time period, and the S/W process time period needed for starting up a timer, and a time period from the task starting to the packet transmission beginning are predicted and stored in the control information in advance. A set value calculating part calculates a timer set value at the system initialization. In a packet forming part, the timer set value is set in a relative time timer for starting the timer. The relative time timer generates an interrupt after a specific elapse time has passed for starting a transmission requesting part. By dint of this, the time lag of the time period from the period interrupt to the packet transmission beginning can be reduced, and each of the formed packets is certainly requested to be transmitted within each requested time period for processing.

Claims17

Dependent claims

A transmission system in which a packet is formed and transmitted within a specific time period, comprising:

(a) a periodic interrupt generating part for generating a periodic interrupt at intervals longer than the specific time period;
(b) a relative time timer in which a specific timer set value is set, for generating an interrupt by measuring a specific elapse time based on the specific timer set value;
(c) a control information memorizing part for memorizing control information used for calculating the specific elapse time measured by the relative time timer;
(d) a set value calculating part for calculating the specific timer set value to be measured by the relative time timer, by using the control information memorized in the control information memorizing part;
(e) a packet forming part, which is started when the periodic interrupt by the periodic interrupt generating part occurs, for setting the specific timer set value calculated by the set value calculating part in the relative time timer and forming a packet;
and
(f) a transmission requesting part, which is started when the interrupt by the relative time timer occurs, for transmitting the packet formed by the packet forming part.

4 more elements

Dependencies are inferred from the claim text.