Efficient full duplex simultaneous message transfer

• US 6,496,487 B2
• Filed: 11/05/1998
• Issued: 12/17/2002
• Est. Priority Date: 11/05/1998
• Status: Expired due to Fees

• Current Assignee: Visteon Global Technologies Incorporated (Visteon Corporation)
• Original Assignee: Visteon Global Technologies Incorporated (Visteon Corporation)
• Inventors: Tiedje, Kevin Mark, Franz, Michael John Leonard
• Primary Examiner(s): Jung, Min
• Application Number:
  US09/186,293
• Publication Number:
  US 20010043567A1
• Time in Patent Office: 1,503 Days
• Field of Search: 370/276, 370/282, 370/294, 370/295, 370/419, 370/420, 370/522, 709/208, 709/227, 709/229, 709/232
• US Class Current: 370/276
• CPC Class Codes: G06F 13/4291 using a clocked protocol

Abstract

A method is provided for transferring message data between stations of a communications network where the network has plurality of interconnected stations with each station having a microprocessor, data storage means for storing message data and a peripheral device providing an interface for the station to facilitate transmission and reception of messages along the network with a predetermined network protocol. The method includes initiating a transaction between the microprocessor and the peripheral device, transferring a command code from the microprocessor to the peripheral device, sending a status signal from the peripheral device to the microprocessor in response to receiving the command code, sending transmission data from the microprocessor to the peripheral device for output to the network, and sending any data stored in the data storage means from the peripheral devices to the microprocessor. The first byte of the microprocessor message contains a command signal and the remaining bytes contain transmission data or dummy data. The message protocol associated with the method supplants any existing serial peripheral interface protocol.

Claims

1. A method for transferring message data between stations of a communications network, said communications network having a plurality of interconnected stations with each of said stations having a microprocessor and an associated peripheral device, said method comprising the steps of:

activating said associated peripheral device by sending a chip select signal from said station'"'"'s microprocessor to said associated peripheral device;

initiating transfer of multiple blocks of transmission data from one of said stations onto said network only by sending a control signal from said station'"'"'s microprocessor to said associated peripheral device;

sending a status signal from said associated peripheral device to said station'"'"'s microprocessor; and

transferring said multiple blocks of transmission data from said station'"'"'s microprocessor to said associated peripheral device in a single serial transfer during a single cycle of said chip select signal for output onto said network while transferring multiple blocks of received data stored in said associated peripheral device in a single serial transfer during said single cycle of said chip select signal for input to said microprocessor.

2. The method of claim 1 including the step of indicating whether data received from the network is stored in said peripheral device with a status signal.

3. The method of claim 1 including the step of transferring said transmission data and said received data in 8-bit blocks.

4. The method of claim 1 including the steps of:

transferring said transmission data and said received data in multibit blocks; and

including a transmit command code in an initial one of said multibit blocks of the transmission data.

5. The method of claim 1 including the steps of:

transferring said transmission data and said received data in multibit blocks; and

including a status bit in an initial one of said multibit blocks of the received data.

6. A method for transferring message data between stations of a communications network, said communications network having a plurality of interconnected stations with each of said stations having a microprocessor and an associated peripheral device, said microprocessor having a serial peripheral interface, said method comprising the steps of:

activating said associated peripheral device by sending a chip select signal from said station'"'"'s microprocessor to said associated peripheral device;

initiating transfer of transmission data from one of said stations onto said network only by sending a control signal from said station'"'"'s microprocessor through said serial peripheral interface to said associated peripheral device during a single cycle of said chip select signal;

sending a status signal from said associated peripheral device through said serial peripheral interface to said station'"'"'s microprocessor during said single cycle of said chip select signal; and

transferring said transmission data from said station'"'"'s microprocessor through said serial peripheral interface to said associated peripheral device in a single serial transfer during said single cycle of said chip select signal for output onto said network while transferring received data stored in said associated peripheral device through said serial peripheral interface in a single serial transfer during said single cycle of said chip select signal for input to said microprocessor.

7. The method of claim 6 including the step of indicating whether data received from the network is stored in said peripheral device with a status signal.

8. The method of claim 6 including the step of transferring said transmission data and said received data in 8-bit blocks.

9. The method of claim 6 including the steps of:

transferring said transmission data and said received data in multibit blocks; and

including a transmit command code in an initial one of said multibit blocks of the transmission data.

10. The method of claim 9 including the step of including a status bit in an initial one of said multibit blocks of the received data.

11. A method for transferring message data between stations of a communications network, said communications network having a plurality of interconnected stations, each of said stations having a processor, data storage means for storing message data and a peripheral device providing an interface for said station to facilitate transmission and reception of messages along said communications network with a predetermined network protocol, said method comprising the steps of:

activating said associated peripheral device by sending a chip select signal from said station'"'"'s microprocessor to said associated peripheral device;

initiating a transaction between said processor and said peripheral device only by

transferring a command code from said processor to said peripheral device;

sending a status signal from said peripheral device to said station processor;

sending transmission data from said processor to said peripheral device in a single serial transfer during a single cycle of chip select signal for output to said network; and

sending any data stored in said data storage means from said peripheral devices to said processor in a single serial transfer during said single cycle of chip select signal with said transmission data.

12. The method of claim 11 including the step of indicating whether data received from the network is stored in said peripheral device with a status signal.

13. The method of claim 11 including the step of transferring said transmission data and said received data in 8 bit blocks.

14. The method of claim 13 including the step of including a transmit command code in an initial one of said 8-bit blocks of the transmission data.

15. The method of claim 13 including the step of including a status bit in an initial one of said 8-bit blocks of the received data.

16. The method of claim 11 including the step of including a transmit code in said command code.

17. The method of claim 11 including the step of including a dummy code in said command code.

18. The method of claim 11 including the step of receiving data from said network and storing said data in said peripheral device.

19. The method of claim 11 including the step of receiving dummy data from said network and storing said dummy data in said peripheral device.