| 摘要 |
An inter-repeater backplane that allows either synchronous or asynchronous data transmission between multiple repeaters integrated into a single hub and enables any repeater to be swapped out without causing the backplane to crash, hang-up, or pass error messages. A dual analog, digital collision signaling scheme is utilized to obviate the need for additional drivers or external glue logic for arbitration. "the specific port of a hub receiving data (PORTN)". and The one port left state (PORTM) information is embedded within the backplane signals. Thus, the backplane scheme according to the present invention is completely seamless. Unique state machines enable the repeater to transmit data either synchronously or asynchronously. In the synchronous mode of data transmission, the data is synchronized with the system clock. When the asynchronous mode of data transmission is selected, the recovered data is synchronized with a clock signal associated with the transmitting repeater. Mixed signal state machines operate in conjunction with the dual analog, digital collision signaling scheme to prevent malfunctions when individual repeaters are swapped or removed. The mixed signal state machines implement the functions of the repeaters and control the transitions on the backplane. Thus, the unique analog digital backplane combination in conjunction with the repeater inter-repeater blackplane (IRB) state machine makes bus arbitration unnecessary.
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