Bus driver with data dependent drive strength control logic

G - Physics – 06 – F

Patent

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Details

G06F 13/40 (2006.01) H04B 1/38 (2006.01) H04B 15/00 (2006.01) H04L 25/02 (2006.01)

Patent

CA 2363959

A transceiver circuit for transmitting a data signal over a communications bus (10) at a predefined bit rate includes a transmitter (4). The data signal is a digital signal having first and second logic levels. The transmitter (4) receives and modifies the data signal and feeds the modified data signal to the communications bus (10). The transmitter (4) includes a drive circuit (7) and an output circuit (6). The drive circuit (7) receives the data signal and a clock signal and generates control signals which depend on the logic level of the data signal. The control signals are sequentially generated when the data signal has consecutive bits of the same logic level. The output circuit (6) receives the control signals and the data signal and generates an output signal which corresponds to the data signal, but which has a varying drive strength determined by the control signals.

L'invention concerne un émetteur-récepteur, comprenant un émetteur (4), pour l'émission d'un signal de données via un bus de communications (10) à un débit binaire prédéterminé. Le signal de données est un signal numérique comportant un premier et un second niveau logique. L'émetteur (4) reçoit et convertit le signal de données et envoie le signal de données modifié au bus de communications (10). L'émetteur (4) comprend un circuit de commande (7) et un circuit de sortie (6). Le circuit de commande (7) reçoit le signal de données et un signal d'horloge, et génère des signaux de commande qui dépendent du niveau logique du signal de données. Les signaux de commande sont générés séquentiellement lorsque le signal de données comporte des bits consécutifs du même niveau logique. Le circuit de sortie (6) reçoit les signaux de commande et le signal de données, et génère un signal de sortie correspondant au signal de données mais ayant une puissance de commande variable selon les signaux de commande.

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