Apple Inc.

Apple Computers Inc.

William S Duckwall

Michael D Teener

Jerrold Von Hauck

Prashant Kanhere

An electronic system interconnect. The interconnect comprises a first node and a second node coupled to the first node. The interconnect is initially configured to include the first and second nodes. A third node is added to the interconnect after the interconnect is initially configured, and the first node responds to the addition of the third node by initiating a new connect handshake with the third node. The first node begins by transmitting a first signal to the third node. The first node signals that the third node has been added to the interconnect if the third node responds to the first signal by transmitting a second signal. The first node causes the interconnect to be reconfigured if the third node transmits a third signal in response to receiving the first signal.

Method and apparatus for the addition and removal of nodes from a common interconnect

In a first embodiment, multi-speed concatenated packet strings are transmitted by a first node on a serial bus. To accommodate multi-speed packets, a speed signal is transmitted immediately prior to the packet. In a second embodiment, ACK-concatenation is used to allow a node to transmit a data packet immediately after transmitting an acknowledge signal on the bus. The data packet need not be related to the ACK packet. In a third embodiment, a node which receives a first data packet followed by a data end signal on a child port, concatenates a second data packet onto the first data packet during retransmission. The second data packet is also transmitted down the bus in the direction of the node which originally transmitted the first data packet.

Fly-by serial bus arbitration

A method for administering transmission of a first type of packets and a second type of packets over a serial bus. In one embodiment, the method comprises: if there is a packet of a second type to be sent, then concatenating the packet of the second type to a plurality of packets of the first type and sending the plurality of packets of the first type followed by the concatenated packet of the second type; and if there is no packet of the second type to be sent, then concatenating a bogus ack packet to the plurality of packets of the first type and sending the plurality of packets of the first type followed by the concatenated bogus ack packet.

Fly-by and ack-accelerated arbitration for broadcast packets

A method and apparatus for accelerating detection of speed code signals, and in particular Ssignals, for IEEE Standard 1394-1995 serial bus devices. The present invention validates Smode immediately after detecting an Sspeed signal, or immediately after detecting an Sspeed signal following a first Sspeed signal. The invention further provides Sand Smode validation according to current implementations. Additionally, the invention does not require RX_DATA_PREFIX as a pre-requisite for signal detection.

Method and apparatus for accelerating detection of serial bus device speed signals

A method and apparatus for accelerating detection of speed code signals, and in particular Ssignals, for IEEE Standard 1394-1995 serial bus devices. The present invention validates Smode immediately after detecting an Sspeed signal, or immediately after detecting an Sspeed signal following a first to Sspeed signal. The invention further provides Sand Smode validation according to current implementations. Additionally, the invention does not require RX_DATA_PREFIX as a pre-requisite for signal detection.

A method and apparatus for accelerating detection of speed code signals, and in particular S signals, for IEEE Standard 1394-1995 serial bus devices. The present invention validates S mode immediately after detecting an S speed signal, or immediately after detecting an S speed signal following a first S speed signal. The invention further provides S and S mode validation according to current implementations. Additionally, the invention does not require RX_DATA_PREFIX as a pre-requisite for signal detection.

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Santa Cruz, CA, United States of America

William S Duckwall