Transmission-line-voltage control circuit and electronic device including the control circuit

An electronic device for controlling a level of a transmission line, a signal of a first level indicating a logic high and a signal of a second level indicating a logic low being supplied to the transmission line, said electronic device comprising:

• a comparing means for comparing said signal supplied to the transmission line to a reference voltage value;
• at least one electronic circuit means for supplying a transmission signal to the transmission line;
• and
• a transmission-line-voltage control circuit for reducing, after said signal of the first level is supplied to the transmission line and compared to said reference voltage value, the level of said transmission line to a third level which indicates the logic high and is less than the first level, and for increasing, after said signal of the second level is supplied to the transmission line and compared to the reference voltage value, the level of the transmission line to a fourth level which indicates the logic low and is higher than the second level,
• wherein when the transmission signal in the transmission line transits to another logic level, said transmission signal transits from said third level to said second level and from said fourth level to said first level, and wherein said control circuit latches the level of said transmission line.

An electronic device comprising:

• a transmission line for transmitting signals;
• at least one signal-output circuit supplying a signal of a first level indicating a logic high and a signal of a second level indicating a logic low to the transmission line;
• at least one signal-input circuit receiving said signal of the first level and said signal of the second level from the transmission line;
• and comparing said signal of the first level to a reference voltage value;
• and
• a transmission-line-voltage control circuit, connected to the transmission line, for reducing, after said signal of the first level is supplied to the transmission line and compared to said reference voltage value, a level of said transmission line to a third level which indicates the logic high and is less than the first level, and for increasing, after said signal of the second level is supplied to the transmission line and compared to said reference voltage value, the level of the transmission line to a fourth level which indicates the logic low and is higher than the second level,
• wherein when the transmission signal in the transmission line transits to another logic level, said transmission signal transits from said third level to said second level and from said fourth level to said first level, and wherein said control circuit latches the level of said transmission line.

An electronic device comprising:

• a transmission line for transmitting signals;
• and
• at least one signal-output circuit supplying a signal of a first level indicating a logic high and a signal of a second level indicating a logic low to the transmission line, said signal-output circuit including a transmission-line-voltage control circuit, connected to the transmission line, for reducing, after said signal of the first level is supplied to the transmission line, a level of said transmission line to a third level which indicates the logic high and is less than the first level, and for increasing, after said signal of the second level is supplied to the transmission line, the level of the transmission line to a fourth level which indicates the logic low and is higher than the second level;
• and
• at least one signal-input circuit receiving said signal of the first level and said signal of the second level from the transmission line,
• wherein said control circuit latches the level of said transmission line.

An electronic device comprising:

• a transmission line for transmitting signals;
• and
• at least one signal-output circuit supplying a signal of a first level indicating a logic high and a signal of a second level indicating a logic low to the transmission line one signal-input circuit said at least one signal-output circuit including a transmission-line-voltage control circuit, connected to the transmission line, for reducing, after said signal of the first level is supplied to the transmission line, a level of said transmission line to a third level which indicates the logic high and is less than the first level, and for increasing, after said signal of the second level is supplied to the transmission line, the level of the transmission line to a fourth level which indicates the logic low and is higher than the second level,
• wherein said control circuit latches the level of said transmission line.

An electronic device comprising:

• a transmission line for transmitting signals;
• at least one signal-output circuit supplying a signal of a first level indicating a logic high and a signal of a second level indicating a logic low to the transmission line said signal-output circuit including means for reducing, after supplying said signal of the first level to the transmission line, a level of said transmission line to a third level which indicates the logic high and is less than the first level, and for increasing, after supplying said signal of the second level to the transmission line, the level of the transmission line to a fourth level which indicates the logic low and is higher than the second level;
• and
• at least one signal-input circuit receiving said signal of the first level and said signal of the second level from the transmission line, and comparing said signal to a reference voltage value
• wherein when the transmission signal in the transmission line transmits to another logic level, said transmission signal transits from said third level to said second level and from said fourth level to said first level, and wherein said circuit latches the level of said transmission line.