Method and apparatus for transferring data at an asynchronous channel between domains with different clock speeds

Abstract

A method for transferring data between a first unit and a second unit, wherein the first unit accumulates data produced at a first frequency and the second unit queries the accumulated data at a second frequency, comprising querying the first unit's first total delta and a first value representing a time delta matching the first total delta, where the first total delta is the data content of the accumulated data blocks present in the first unit at the time of the query, determined by the first The total delta is generated by using the first value to generate a second total delta, wherein the second total delta is the data content of a data block adapted to a nominal time increment of the second frequency, and transmitting the second total delta to Second unit.

Description

technical field [0001] When transferring data between two devices or units operating at different clock speeds, it is also important to synchronize the two clocks in addition to ensuring that all data is transferred. Background technique [0002] For example, data may be generated in a first unit at a first clock speed and then read or queried by a second unit at a second clock speed different from the first clock speed. In sensors, for example, partial increments are generated and then accumulated in the data line cycle. The read-out unit reads the current state of the accumulator in the query cycle, so that the total increment generated during the accumulation interval in the corresponding query cycle is transmitted from the sensor to the read-out unit. [0003] The total increment is formed by adding up over an integer number of data line clocks. If the query clock rate is not an integer multiple of the data line clock rate, then this integer number of data line clock r...

AI Technical Summary

Problems solved by technology

[0005] However, variations in the number of partial increments in the read unit included in the total increment read are interpreted as additional noise

The total increment read does not exactly correspond to the data integral over the query tick, whereby the so-called differential error criterion describing this property is only insufficiently satisfied

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