Multi-Host Hot-Plugging of Multiple Cards

Patent metadata

Field	Value
Publication number	US-2016246751-A1
Application number	US-201514626996-A
Country	US
Kind code	A1
Filing date	Feb 20, 2015
Priority date	Feb 20, 2015
Publication date	Aug 25, 2016
Grant date	—

Abstract

Hot-plug actions are enabled in an M-host, N-card system architecture. An arbiter receives status signals from the N hot-pluggable cards, and transfers the status signals to at least some of the M host devices. In response to the status signals indicating a hot-plug action, the arbiter receives at least one host command. The arbiter transfers the host command to one or more of the N hot-pluggable cards according to an arbiter algorithm.

First claim

What is claimed is:

1 . A method comprising:
receiving status signals from a plurality of hot-pluggable cards; transferring the status signals to a plurality of host devices; in response to the status signals indicating a hot-plug action, receiving at least one host command; and transferring the host command to one or more of the hot-pluggable cards according to an arbiter algorithm.

2 . The method of claim 1 , further comprising receiving an updated status signal indicating that the hot-plug action is complete, and transferring the updated status signal to the plurality of host devices.

3 . The method of claim 1 , further comprising updating the arbiter algorithm.

4 . The method of claim 1 , wherein the status signals include an attention signal, a presence signal, a power fault signal, and a manual retention latch signal.

5 . The method of claim 1 , wherein the host command includes a power enable on command, a power enable off command, a power light on command, a power light blinking command, a power light off command, an attention light on command, an attention light blinking command, or an attention light off command.

6 . The method of claim 5 , wherein the arbiter algorithm directs the power enable on command to be transferred to the hot-pluggable cards only when power enable on commands have been received from all of the host devices.

7 . The method of claim 5 , wherein the arbiter algorithm directs the power light on command to be transferred to the hot-pluggable cards when the power light on command has been received from at least one of the host devices and when the power light blinking command has not been received from any of the host devices.

8 . The method of claim 5 , wherein the arbiter algorithm directs the power light blinking command to be transferred to the hot-pluggable cards when the power light blinking command has been received from at least one of the host devices.

9 . An apparatus comprising:
an Inter-Integrated Circuit (I2C) input/output (I/O) module to communicate with a plurality of host devices; and an arbiter module configured to:
receive status signals from a plurality of hot-pluggable cards;
transfer the status signals to the host devices through the I2C I/O module;
in response to the status signals indicating a hot-plug action, receiving at least one host command through the I2C I/O module; and
transfer the host command to one or more of the hot-pluggable cards according to an arbiter algorithm.

10 . The apparatus of claim 9 , wherein the arbiter module is further configured to:
receive an updated status signal indicating that the hot-plug action is complete; and transfer the updated status signal to the plurality of host devices.

11 . The apparatus of claim 9 , further comprising an In System Programming/In Application Programming (ISP/IAP) module to receive an update of the arbiter algorithm and implement the update of the arbiter algorithm in the arbiter module.

12 . The apparatus of claim 9 , wherein the status signals include an attention signal, a presence signal, a power fault signal, and a manual retention latch signal.

13 . The apparatus of claim 9 , wherein the host command includes a power enable on command, a power enable off command, a power light on command, a power light blinking command, a power light off command, an attention light on command, an attention light blinking command, or an attention light off command.

14 . The apparatus of claim 13 , wherein the arbiter module directs the power enable on command to be transferred to the hot-pluggable cards only when power enable on commands have been received from all of the host devices.

15 . The apparatus of claim 13 , wherein the arbiter module directs the power light on command to be transferred to the hot-pluggable cards when the power light on command has been received from at least one of the host devices and when the power light blinking command has not been received from any of the host devices.

16 . The apparatus of claim 13 , wherein the arbiter module directs the power light blinking command to be transferred to the hot-pluggable cards when the power light blinking command has been received from at least one of the host devices.

17 . A system comprising:
a plurality of hot-pluggable cards, each of the hot-pluggable cards producing a status signal; a plurality of host devices to interact with the plurality of hot-pluggable cards; and an arbiter module to mediate interactions between the hot-pluggable cards and the host devices by:
receiving the status signals from the hot-pluggable cards;
transferring the status signals to the host devices;
in response to the status signals indicating a hot-plug action, receiving at least one host command; and
transferring the host command to one or more of the hot-pluggable cards according to an arbiter algorithm.

18 . The system of claim 17 , wherein the arbiter module further receives an updated status signal indicating that the hot-plug action is complete, and transfers the updated status signal to the plurality of host devices.

19 . The system of claim 17 , wherein the arbiter module receives an update to the arbiter algorithm.

20 . The system of claim 17 , wherein the status signals include an attention signal, a presence signal, a power fault signal, and a manual retention latch signal.

21 . The system of claim 17 , wherein the host command includes a power enable on command, a power enable off command, a power light on command, a power light blinking command, a power light off command, an attention light on command, an attention light blinking command, or an attention light off command.

22 . The system of claim 17 , wherein the arbiter module directs the power enable on command to be transferred to the hot-pluggable cards only when power enable on commands have been received from all of the host devices.

23 . The system of claim 17 , wherein the arbiter module directs the power light on command to be transferred to the hot-pluggable cards when the power light on command has been received from at least one of the host devices and when the power light blinking command has not been received from any of the host devices.

24 . The system of claim 17 , wherein the arbiter module directs the power light blinking command to be transferred to the hot-pluggable cards when the power light blinking command has been received from at least one of the host devices.

Assignees

• Cisco Tech Inc

Inventors

• Cai Xiaoguang
• Pan Zhen
• Liu Changzheng

Classifications

• G06F13/4282

  on a serial bus, e.g. I2C bus, SPI bus (on daisy chain buses G06F13/4247) · CPC title

• G06F13/4081 Primary

  Live connection to bus, e.g. hot-plugging (current or voltage limitation during live insertion H02H9/004) · CPC title