# US 9,882,739 B2 · Method for disabling a legacy loop detect circuit in a beta node

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- Number: US 9,882,739 B2
- Document ID: US9882739B2
- Status: Granted
- Kind: B2
- Application number: 15/252,074
- Filed: 2016-08-30
- Published: 2016-12-22
- Granted: 2018-01-30
- Earliest claimed: 2014-06-17
- Assignees: DAP Holding B.U.
- Applicants: Richard Mourn
- Inventors: Richard Mourn
- Web page: https://patentgrep.com/patent/US9882739B2

## CPC

- H04L 12/40078: {Bus configuration (home automation networks H04L12/2803; arrangements for maintenance or administration H04L41/00)}
- G06F 13/4282: {on a serial bus, e.g. I2C bus, SPI bus (on daisy chain buses G06F13/4247)}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

A method for disabling or removing a Legacy loop detect circuit to eliminate the circuit erroneously detecting a legacy loop during a IEEE-1394 serial bus initialization. The method includes providing a programmable code to the Legacy loop detect circuit for increasing a reset count to a value greater than three (3) to the Legacy loop circuit thus reducing the probability of an erroneous disconnect of a Beta node connection. This method provides for more robust Beta loop node operation during high frequency bus resets.

## Claims

### Claim 1

A method of increasing filter values in a Legacy loop detect circuit in a Beta node and providing a more robust Beta node operation during high frequency bus resets, the step comprising:
providing a programmable code to the Legacy loop detect circuit for increasing a filter value to a value greater than the values defined by IEEE-1394-2008; and
increasing the value of the programmable code, having CONFIG-TIMEOUT time-filter value, to a value greater than 166.9 μsec before a transition from P2:Active state to P11: Untested state occurs.

### Claim 2 (depends on 1)

The method as described in claim 1 wherein the programmable code, having MAX_ARB_STATE_TIME time filter value, is increased to a value greater than 400 μsec before a transition from P2: Active state to P11: Untested state occurs.

### Claim 3 (depends on 1)

The method as described in claim 1 wherein a reset Count filter value in the programmable code is increased to a value greater than (3) three before a transition from P2: Active state to a P11: Untested state occurs.

### Claim 4

A method of increasing filter values in a Legacy loop detect circuit in a Beta node and providing a more robust Beta node operation during high frequency bus resets, the step comprising:
providing a programmable code to the Legacy loop detect circuit for increasing a filter value to a value greater than the values defined by IEEE-1394-2008, wherein the programmable code, having CONFIG-TIMEOUT time filter value, is increased to a value greater than 166.9 μsec before a transition from P2:Active state to P11: Untested state occurs; and
increasing a reset Count filter value in the programmable code to a value greater than (3) three before a transition from P2: Active state to a P11: Untested state occurs.

### Claim 5

A method of increasing filter values in a Legacy loop detect circuit in a Beta node and providing a more robust Beta node operation during high frequency bus resets, the step comprising:
providing a programmable code to the Legacy loop detect circuit for increasing a filter value to a value greater than the values defined by IEEE-1394-2008, wherein the programmable code, having MAX_ARB_STATE_TIME time filter value, is increased to a value greater than 400 μsec before a transition from P2: Active state to P11: Untested state occurs.

### Claim 6 (depends on 5)

The method as described in claim 5 wherein a resetCount filter value in the programmable code is increased to a value greater than (3) three before a transition from P2: Active state to a P11: Untested state occurs.