Signal transmission apparatus for setting delay amount based on operational speed
AssigneeNEC Corporation
InventorTakuji Nakamura
Life of this patent
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Abstract
A signal transmission apparatus is disclosed for setting delay amounts based on an operational speed. At least some of a plurality of rectangular wave signals transmitted in parallel are individually delayed by a plurality of signal delaying means for different time periods from one another in order to prevent the occurrence of noise. At this point, the delay time in the plurality of signal delaying means are set by time varying means based on the operational speed of a digital circuit which outputs digital data as the rectangular wave signals.
Claims9
A signal transmission apparatus comprising:
- a plurality of signal transmitting means each transmitting a rectangular wave signal over a signal transmission path, the rising or falling edges of said signals occur substantially simultaneously;
- a plurality of signal delaying means each coupled to a signal transmission path and each delaying one of said plurality of rectangular wave signals transmitted by said plurality of signal transmitting means for different time periods from one another;
- and
- time varying means coupled to said plurality of signal delaying means and to the signal transmission paths to transmit the rectangular wave signals from said plurality of signal transmitting means with a delay time based on operational speeds of digital circuits which output said rectangular wave signals.
The signal transmission apparatus comprising:
- a plurality of signal transmitting means each transmitting a rectangular wave signal, the rising or falling edges of said signals occur substantially simultaneously;
- a plurality of signal delaying means each delaying each of at least some of said plurality of rectangular wave signals transmitted by said plurality of signal transmitting means for different time periods from one another;
- and
- time varying means for setting the delay time at said plurality of signal delaying means based on an operational speed of a digital circuit which outputs digital data as said rectangular wave signals;
- wherein each of said plurality of signal delaying means includes a predetermined number of delay circuits with different delay time from one another, and
- said time varying means comprises a plurality of selectors each selecting one of said predetermined number of delay circuits in each of said plurality of signal delaying means.
A data processing apparatus comprising:
- a digital circuit for performing data processing with digital data, an analog circuit for performing data processing with analog data, and a signal transmission apparatus comprising:
- a plurality of signal transmitting means each transmitting a rectangular wave signal, the rising or falling edges of said signals occur substantially simultaneously;
- a plurality of signal delaying means each delaying each of at least some of said plurality of rectangular wave signals transmitted by said plurality of signal transmitting means for different time periods from one another;
- and
- time varying means for setting the delay time at said plurality of signal delaying means based on an operational speed or a digital circuit which outputs digital data as said rectangular wave signals;
- wherein said digital circuit producing said plurality of rectangular wave signals as digital data, outputting said signals, and controlling time settings with said time varying means.
Dependencies are inferred from the claim text.