Printed circuit board, and backplane data transmission method
AssigneeFujitsu Limited
InventorFutoshi Izumi
Life of this patent
Estimating the term…
Abstract
In a receiving-side printed circuit board, a reflected-waveform analyzing unit analyzes a reflected wave generated in a transmission line on a backplane along with transmission of a signal from a transmitting-side printed circuit board, and acquires waveform data that indicates a waveform of the reflected wave. An input signal identifying unit calculates a size of the reflected wave that is currently received based on the waveform data and data on previously received signals. The input signal identifying unit corrects a threshold value by the calculated size, and identifies a state of a bit indicated by the signal from the transmitting-side printed circuit board.
Claims5
A printed circuit board on a backplane that exchanges signals with another printed circuit board on the backplane via a transmission line, the printed circuit board comprising:
- an analyzing unit that analyzes a reflected wave generated in the transmission line along with transmission of a signal from the other printed circuit board and obtains waveform data that indicates a waveform of the reflected wave;
- a calculating unit that calculates a size of the reflected wave based on the waveform data and data on previously received signals;
- and
- an identifying unit that corrects a threshold value by calculated size of the reflected wave and identifies a state of a bit indicated by the signal from the other printed circuit board.
A backplane data transmission method for exchange of signals between a first printed circuit board and a second printed circuit board via transmission line on a backplane, the backplane data transmission method comprising:
- the first printed circuit board transmitting a signal of a single waveform to the second printed circuit board via the transmission line;
- the second printed circuit board analyzing a reflected wave generated in the transmission line along with the transmission of the signal to obtain waveform data that indicates a waveform of the reflected wave;
- the second printed circuit board calculating a size of the reflected wave based on the waveform data and data on previously received signals;
- the second printed circuit board correcting a threshold value by calculated size of the reflected wave;
- and
- the second printed circuit board identifying a state of a bit indicated by the signal transmitted from the first printed circuit board.
Dependencies are inferred from the claim text.