Request with response mechanism and method for a local area network controller
First Claim
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1. A token bus local area network including a plurality of stations thereon incorporating a request with response mechanism comprising:
- a transmitting one of said stations for sending a request with response data frame to a predetermined receiving one of said stations on said network;
said predetermined receiving station for responding to said transmitting station with a response data frame in response to said request with response data frame if said request with response mechanism thereof is enabled;
wherein said predetermined receiving station comprises first means for detecting an enable bit and second means for detecting a pointer.
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Abstract
A request with response mechanism and method for a local area network controller utilizes an enable bit, a pointer, a counter and an interrupt to create the proper response to a received request with response data frame without the active aid of a host computer.
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Citations
12 Claims
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1. A token bus local area network including a plurality of stations thereon incorporating a request with response mechanism comprising:
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a transmitting one of said stations for sending a request with response data frame to a predetermined receiving one of said stations on said network; said predetermined receiving station for responding to said transmitting station with a response data frame in response to said request with response data frame if said request with response mechanism thereof is enabled; wherein said predetermined receiving station comprises first means for detecting an enable bit and second means for detecting a pointer. - View Dependent Claims (2, 3)
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4. A method for communicating between a plurality of stations having a request with response mcchanism on a local area network thereof comprising the steps of:
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transmitting a transmit frame having a request with response data frame from a transmitting one of said stations to a predetermined receiving one of said stations, said predetermined receiving station having a response data frame and said response with request data frame comprising an enable signal, a valid bit having first and second conditions, and a pointer; receiving said transmit frame at said predetermined receiving station; testing said transmit frame for the presence of said request with response data frame; determining if said request with response mechanism is enabled by detecting the presence or absence of said enable signal; determining the condition of said valid bit; indicating by detecting the value of said pointer where said response data frame to said request with response data frame is located if said valid bit is in said first condition thereof; and counting to determine the length of said response data frame; whereupon said response data frame may be transmitted by said receiving station to said transmitting station. - View Dependent Claims (5, 6)
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7. A request with response mechanism for a receiving station on a local area network;
- wherein a request with response data frame having an enable signal, a valid bit having first and second conditions, and a pointer is transmitted to said receiving station as part of a transmit frame;
comprising;means for testing said transmit frame for said request with response data frame; first means for determining if said request with response mechanism is enabled; second means for determining the condition of said valid bit; means for detecting said pointer which indicates where, in said receiving station, a response data frame to said request with response data frame is located if said valid bit is in said first condition thereof; means for counting to determine the length of said response data frame; and means for transmitting said response data frame based on the location obtained from said detecting means and the length of said response data frame obtained from said counting means. - View Dependent Claims (8, 9)
- wherein a request with response data frame having an enable signal, a valid bit having first and second conditions, and a pointer is transmitted to said receiving station as part of a transmit frame;
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10. A token bus local area network including a plurality of stations thereon incorporating a request with response mechanism comprising:
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a transmitting one of said stations for sending a request with response data frame to a predetermined receiving one of said stations on said network; said predetermined receiving station for responding to said transmitting station with a response data frame in response to said request with response data frame, said request with response mechanism including means for generating a valid bit having first and second conditions thereof. - View Dependent Claims (11, 12)
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Specification