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Time-multiplexed multi-speed bus

  • US 6,425,041 B1
  • Filed: 06/05/1998
  • Issued: 07/23/2002
  • Est. Priority Date: 06/05/1998
  • Status: Expired due to Term
First Claim
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1. A time-multiplexed multi-speed communications bus comprising:

  • a number of high-speed signal lines that are operated only at high speed;

    a number of low-speed signal lines that are operated only at low speed;

    a number of multi-speed signal lines that are operated at low speed together with the low-speed signal lines and at high speed together with the high-speed signal lines;

    at least one low-speed device connected to the multi-speed signal lines and to the low-speed signal lines, the time-multiplexed multi-speed bus operating at low speed to carry out a bus operation when one of the low-speed devices initiates the bus operation with another one of the low-speed devices;

    at least one high-speed device connected to the multi-speed signal lines and to the high-speed signal lines, the time-multiplexed multi-speed bus operating at high speed to carry out a bus operation when one of the high-speed devices initiates the bus operation with another one of the high-speed devices; and

    when a bus operation between one of the low-speed devices and one of the high-speed devices is initiated, during the portion of the bus operation in which data is transmitted by a device, the time-multiplexed multi-speed bus operates at the speed required by the device that transmits data for the operation, and during the portion of the bus operation in which data is received by a device, the time-multiplexed multi-speed bus operates at the speed required by the device that receives the data.

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