Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

10-Bit Addressing Byte to Control a 12C Switch Device

IP.com Disclosure Number: IPCOM000034007D
Publication Date: 2005-Jan-11
Document File: 2 page(s) / 166K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method that uses a 10-bit addressing mode prefix to control a bus switch. Benefits include a solution that provides unlimited address space.

This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 84% of the total text.

10-Bit Addressing Byte to Control a 12C Switch Device

Disclosed is a method that uses a 10-bit addressing mode prefix to control a bus switch. Benefits include a solution that provides unlimited address space.

Background

There is currently a need for a better way to bridge multiple I2C buses.

General Description

The disclosed method uses a 10-bit addressing mode prefix to control a bus switch. The switch uses the 10-bit address packet to select different segments, and a seven-bit slave device on the selected segment.

Figure 1 shows an example system that has a number of beneficial characteristics. Several devices with the same I2C address are used in the system as long as they are separated by the bridging device. Multiple masters use the bridge without the bus being reconfigured by another master (i.e. the transfers through the bridge are atomic).

Figure 2 shows the bridge with two sections; the control logic section tracks the activity on the two buses, and handles the I2C bus protocol while the two buses are not connected together at the bridge. At the appropriate time the FET switch section creates an electrical connection between the two buses allowing the agents on the two busses to compete the transaction.

Advantages

Some implementations of the disclosed structure and method provide one or more of the following advantages:

The disclosed method allows more I2C/SMBus devices to be included in a system with address conflicts. The bridge is faster because fewer bits are r...