Loop network hub using loop initialization insertion
View Patent ↗A loop network hub including a hub port with a loop initialization insertion mechanism. The loop initialization insertion mechanism causes a hub port which detects a new node port connection to automatically begin generating loop initialization data. A hub port continues to generate loop initialization data until that hub port receives a loop initialization sequence. The loop initialization data propagates around the loop of the hub, halting ordinary processing. In this way, the entire loop is cleared. Upon receiving a loop initialization sequence, the hub port originating the loop initialization data inserts the new node port into the loop. At this point, loop initialization begins and each node port in the loop network obtains a unique loop network address.
1. A method comprising:
detecting data sent from a node port to a first hub port;
upon detecting data sent from the node port, generating loop initialization data and sending the loop initialization data from the first hub port to a second hub port of a first loop;
detecting a loop initialization sequence sent from the node port to the first hub port; and
initiating a loop initialization procedure.
2. The method of claim 1 , further comprising passing loop initialization data through the first loop.
3. The method of claim 2 , further comprising ceasing to process transactions in hub ports of the first loop.
4. The method of claim 1 , further comprising receiving a loop initialization sequence at the first hub port from a third hub port.
5. The method of claim 1 , further comprising ceasing to send loop initialization data from the first hub port to the second hub port after detecting a loop initialization sequence sent from the node port to the first hub port.
6. The method of claim 1 , further comprising selecting data from the node port to send from the first hub port to the second hub port.
7. The method of claim 1 , further comprising connecting a device to the node port.
8. The method of claim 1 , further comprising connecting a hub port of a second loop to the node port.
9. The method of claim 1 , further comprising inserting the node port into the first loop after detecting a loop initialization sequence sent from the node port to the first hub port.
10. The method of claim 1 , wherein initiating the loop initialization procedure comprises assigning a unique loop network address to each node port coupled to the first loop.
11. The method of claim 1 , further comprising selecting data from (a) the node port, (b) a third hub port, and (c) a loop initialization data generator to output to the second hub port.
12. The method of claim 1 , further comprising synchronizing timing and frames with data from the node port.
13. The method of claim 1 , further comprising validating operation of the node port before sending data from the node port to a second hub port.
14. A method comprising:
detecting data sent from a node port to a first hub port;
upon detecting data sent from the node port, generating loop initialization data and sending the loop initialization data from the first hub port to a second hub port of a first loop;
detecting a loop initialization sequence received by the first hub port from a third hub port; and
initiating a loop initialization procedure.
15. The method of claim 14 , wherein initiating the loop initialization procedure comprises assigning a unique loop network address to each node port coupled to the first loop.
16. A hub port comprising:
a transmit circuit coupled to a hub link and a node port;
a receive circuit coupled to the node port;
a multiplexer coupled to the receive circuit and the hub link; and
a loop initialization data generator coupled to the multiplexer, wherein the receive circuit controls the multiplexer to select an input from the hub link, node port and loop initialization data generator to send to a second hub port.
17. The hub port of claim 16 , wherein the node port is coupled to a hub port of a second hub.
18. The hub port of claim 16 , wherein the node port is coupled to a device.
19. The hub port of claim 16 , wherein the receive circuit comprises a circuit adapted to detect loop initialization data from the node port.
20. The hub port of claim 16 , wherein the receive circuit comprises a circuit adapted to control the multiplexer.