US5400345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Communications system to boundary-scan logic interface
Assignee: Pitney Bowes Inc
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Filing: 1992-03-06
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Granted: 1995-03-21
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Expires: 2012-03-06
Abstract
Abstract A control node for controlling a predetermined function in response to messages transmitted over a communications bus and for responding to a second class of such messages to exercise boundary-scan logic to test the control node. The boundary-scan logic is implemented in accordance with ANSI/IEEE Standard 1149.1. The second class of messages include Scan Command messages which contain data for controlling the state of the Test Access Port of the boundary-scan logic, Scan Test Data messages which transmit data to be loaded into the instruction registers or the test data registers of the boundary-scan logic, and Scan Results Request messages which control the node to return the test results over the communications bus.
Inventors
- 👤 Frederick W. Ryan, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:33
CPC Classifications
H; H04; H04L; H04L43/00; H04L43/50; G; G01; G01R; G01R31/00; G01R31/28; G01R31/317; G01R31/3181; G01R31/3185; G01R31/318533; G01R31/318555; G01R31/318572
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
67 words
A control node responsive to signals transmitted on a communications bus, said control node comprising; a) boundary-scan test logic for testing the operability of said node; b) first means responsive to a first class of messages comprising said signals for controlling a predetermined function; and c) second means responsive to a second class of messages comprising said signals for exercising said boundary-scan logic to test said node.
Claim 2
Dependent Claim
67 words
A control node responsive to signals transmitted on a communications bus, said control node comprising; a) boundary-scan test logic for testing the operability of said node; b) first means responsive to a first class of messages comprising said signals for controlling a predetermined function; and c) second means responsive to a second class of messages comprising said signals for exercising said boundary-scan logic to test said node.
Claim 3
Dependent Claim
16 words
A control node as described in claim 1 wherein said communications bus is a serial bus.
Claim 4
Dependent Claim
83 words
A control node as described in claim 2 wherein said first means comprises a communications controller responsive to said first class of messages to generate first control signals, and circuitry responsive to said first control signals to implement said predetermined function; and said second means comprises said communications controller which is responsive to said second class of messages to generate second control signals, and a test controller responsive to said second control signals to exercise said boundary control logic to test said node.
Claim 5
Dependent Claim
15 words
A node as described in claim 3 wherein said test controller comprises a state machine.
Claim 6
Dependent Claim
30 words
A node as described in claim 3 wherein said second class of messages comprises a scan command message for controlling the state of TAP controllers comprised in said boundary-scan logic.
Claim 7
Dependent Claim
29 words
A control node as described in claim 5 wherein said scan command message includes TMS data and said test controller serially transmits said TMS data to said boundary-scan logic.
Claim 8
Dependent Claim
29 words
A control node as described in claim 6 wherein said second class of messages includes a scan test data message for transmission of test data to said boundary-scan logic.
Claim 9
Dependent Claim
15 words
A control node as described in claim 7 wherein said test data includes instruction data.
Claim 10
Dependent Claim
24 words
A control node as described in claim 8 wherein said test controller temporarily stores said test data for later output to said boundary-scan logic.
Claim 11
Dependent Claim
39 words
A control node as described in claim 9 wherein said test controller further comprises a sub-machine responsive to a TMS signal transmitted to TAP controllers comprised in said boundary-scan logic for control of the output of said test data.
Claim 12
Dependent Claim
40 words
A control node as described in claim 10 wherein the state structure of said sub-machine is substantially similar to the state structure of said TAP controllers, whereby said test controller outputs said data serially in synchronism with said TAP controllers.
Claim 13
Dependent Claim
56 words
A control node as describe in claim 7 wherein said test controller temporarily stores results data output by said boundary-scan logic as said test data is input, and said second class of messages includes a scan results request message, said communications controller transmitting said results data on said communications bus in response to said request message.
Claim 14
Dependent Claim
29 words
A control node as described in claim 3 wherein said second class of messages includes a scan test data message for transmission of test data to said boundary-scan logic.
Claim 15
Dependent Claim
15 words
A control node as described in claim 13 wherein said test data includes instruction data.
Claim 16
Dependent Claim
29 words
A control node as described in claim 11 wherein said second class of messages includes a scan test data message for transmission of test data to said boundary-scan logic.
Claim 17
Dependent Claim
15 words
A control node as described in claim 15 wherein said test data includes instruction data.
Claim 18
Dependent Claim
32 words
A control node as described in claim 1, wherein said control node communicates with a central control node on said communications bus, said central control node generating said first class of messages.
Claim 19
Dependent Claim
20 words
A control node as described in claim 17 wherein said central control node further generates said second class of messages.
Claim 20
Dependent Claim
32 words
A control node as described in claim 12 wherein said control node communicates with a central control node on said communications bus, said central control node generating said first class of messages.
Claim 21
Dependent Claim
20 words
A control node as described in claim 19 wherein said central control node further generates said second class of messages.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-20 | 1998-09-19 | 1999-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-20 | 2002-09-19 | 2003-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-20 | 2006-09-19 | 2007-03-21 | $7700.00 | Window Closed / Lapsed |