Abstract: A circuit is provide comprising a first input coupled to a transmit data input of a bus transceiver; and a first output coupled to a bus. The circuit is configured to be coupled in parallel with the bus transceiver. The circuit is further configured to, in response to a dominant to recessive transition on the transmit data input, lower an impedance of the bus.

Abstract: A circuit is provided for ringing suppression. The circuit comprises a termination resistor coupled to a bus via a switch; and a control circuit. The control circuit comprises an input coupled to a data input pin of a bus transceiver and an output coupled to control the termination resistor. The circuit is configured to selectively couple the resistor to the bus in response to a transition on the input bit stream.

Abstract: A circuit is provide comprising a first input coupled to a transmit data input of a bus transceiver; and a first output coupled to a bus. The circuit is configured to be coupled in parallel with the bus transceiver. The circuit is further configured to, in response to a dominant to recessive transition on the transmit data input, lower an impedance of the bus.

Abstract: A circuit is provided for ringing suppression. The circuit comprises a termination resistor coupled to a bus via a switch; and a control circuit. The control circuit comprises an input coupled to a data input pin of a bus transceiver and an output coupled to control the termination resistor. The circuit is configured to selectively couple the resistor to the bus in response to a transition on the input bit stream.

Abstract: The invention is related to a Gateway for a data bus system, especially a CAN-Bus-system, with at least two data bus source channels, the gateway being provided with—an interface for each data bus source channel, —a protocol core in each channel interface, —a channel message switch, whose inputs are coupled to the outputs of the protocol cores of the channel interfaces and whose output can be switched to one of its inputs, —a message handler coupled to the output of the channel message switch and being provided with a message filter for selecting messages and with a message buffer, —a channel interface with a protocol core coupled to a data bus target channel, —a control, that, in a diagnostic copy function, copies all the messages from a selectable source channel to the message handler by setting the channel message switch to the position assigned to the selected source channel and that causes the message filter to couple the filtered messages to the interface of the target channel.

Abstract: A data memory for storing elements, which data memory stores the data of the elements and at least a chained list which contains, for each stored element, at least its element address, its element number and a pointer to the address of the stored element having the next-higher element number. There are also provided an element status table, in which the element numbers of the elements present in the data memory are taken up, and also an address reference table which contains the element addresses for all element numbers.

Abstract: A method for conserving power in a CAN microcontroller that includes a processor core and a CAN/CAL module that includes a plurality of sub-blocks that cooperatively function to process incoming CAL/CAN messages, which method includes the steps of placing the processor core in a power-reduction mode of operation (e.g., a sleep or idle mode of operation), placing the CAN/CAL module in a power-reduction mode of operation, and activating the CAN/CAL module to process an incoming CAL/CAN message (e.g., to perform automatic hardware assembly of a multi-frame, fragmented CAL/CAN message), thereby terminating the power-reduction mode of operation thereof, while the processor core is in its power-reduction mode of operation.

Abstract: An acceptance filter (1) according to the invention for filtering identifiers in messages which may be exchanged between users (2, 3, 4) over a data bus takes the form solely of a hardware circuit and is provided jointly for the allocated users (2, 3, 4). An identifier received by an allocated user (2, 3, 4) is compared locally with stored identifiers and examined to see whether the message to which the received identifier belongs is relevant to the allocated user (2, 3, 4) that received it and where appropriate a corresponding acceptance signal is sent to this allocated user (2, 3, 4).