System of controlling the flow of information between senders and receivers across links being used as channels

• US 6,693,880 B2
• Filed: 06/20/2001
• Issued: 02/17/2004
• Est. Priority Date: 09/10/1998
• Status: Expired due to Term

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Gregg, Thomas A., Pandey, Kulwant M.
• Primary Examiner(s): HO, DUC CHI
• Application Number:
  US09/885,608
• Publication Number:
  US 20010030943A1
• Time in Patent Office: 972 Days
• Field of Search: 370/229, 370/230, 370/231, 370/235, 370/389, 370/394, 370/396, 370/413, 370/423, 370/426, 370/464-466, 714/749, 709/211, 709/224, 709/232, 709/237
• US Class Current: 370/235
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/34 ensuring sequence integrity, e.g. using sequence numbers

Abstract

Controlling the flow of information between senders and receivers across links being used as channels. In one example, a self-timed interface link is adapted to be used as a channel. Such an interface is referred to as an integrated cluster bus. The flow control for the integrated cluster bus includes, for instance, a Data Request packet that indicates to the transmitter of data that it can now send the data; a continue indicator that specifies that more data is to follow; and a sequence indicator that is used to determine if a particular message is in proper sequence order. The integrated cluster bus does not require large data buffers and offers low latency messaging.

Claims

1. A system for controlling the flow of information across links between senders and receivers, said system comprising:

a packet including a sequence number usable in maintaining delivery order of said packet, said packet having no memory address and requiring no explicit individual response;

means of sending said packet from a sender to a receiver across a link; and

means for using said sequence number to determine if said packet is in proper order for processing by said receiver.

2. A system for controlling the flow of information across links between senders and receivers, said system comprising:

a packet including a sequence number usable in maintaining delivery order of said packet, said packet having no memory address and requiring no explicit individual response;

means for sending said packet form a sender to a receiver across a link; and

means for using said sequence number to determine if said packet is in proper order for processing by said receiver, wherein said for using comprising;

means for comparing said sequence number with a sequence count of said receiver;

means of determining, when said comparing indicates an inequality, whether said sequence number is a predetermined amount more than said sequence count; and

means for indicating an error when said sequence number is not said predetermined amount more than said sequence count.

3. The system of claim 2, wherein said predetermined amount is one.

4. The system of claim 2, further comprising means for processing said packet when said sequence number is said predetermined amount more than said sequence count.