US 11,656,278 B2
Apparatus for device access port selection
Lee D. Whetsel, Parker, TX (US)
Assigned to Texas Instruments Incorporated, Dallas, TX (US)
Filed by TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed on Aug. 30, 2022, as Appl. No. 17/823,153.
Application 17/823,153 is a division of application No. 17/171,443, filed on Feb. 9, 2021, granted, now 11,448,697.
Application 17/171,443 is a division of application No. 16/522,174, filed on Jul. 25, 2019, granted, now 10,948,539, issued on Mar. 16, 2021.
Application 16/522,174 is a division of application No. 16/108,274, filed on Aug. 22, 2018, granted, now 10,401,429, issued on Sep. 3, 2019.
Application 16/108,274 is a division of application No. 15/591,750, filed on May 10, 2017, granted, now 10,082,540, issued on Sep. 25, 2018.
Application 15/591,750 is a division of application No. 15/174,341, filed on Jun. 6, 2016, granted, now 9,678,157, issued on Jun. 13, 2017.
Application 15/174,341 is a division of application No. 14/625,378, filed on Feb. 18, 2015, granted, now 9,383,410, issued on Jul. 5, 2016.
Application 14/625,378 is a division of application No. 13/891,840, filed on May 10, 2013, granted, now 8,990,649, issued on Mar. 24, 2015.
Application 13/891,840 is a division of application No. 13/628,802, filed on Sep. 27, 2012, granted, now 8,468,406, issued on Jun. 18, 2013.
Application 13/628,802 is a division of application No. 13/272,697, filed on Oct. 13, 2011, granted, now 8,301,946, issued on Oct. 30, 2012.
Application 13/272,697 is a division of application No. 12/880,527, filed on Sep. 13, 2010, granted, now 8,065,578, issued on Nov. 22, 2011.
Claims priority of provisional application 61/242,191, filed on Sep. 14, 2009.
Prior Publication US 2022/0413041 A1, Dec. 29, 2022
Int. Cl. G01R 31/3177 (2006.01); G01R 31/3185 (2006.01); G01R 31/317 (2006.01)
CPC G01R 31/3177 (2013.01) [G01R 31/31723 (2013.01); G01R 31/31725 (2013.01); G01R 31/31727 (2013.01); G01R 31/318533 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A device comprising:
a first access port compliant with a first protocol associated with IEEE 1149.1, wherein the first access port includes:
a serial instruction register;
a serial data register;
a serial input;
a serial output;
a clock input; and
a control input;
a second access port compliant with a second protocol that differs from the first protocol, wherein the second access port includes:
a serial register coupled to at least one of a parallel data receiving circuit and a parallel data providing circuit;
a serial input;
a serial output;
a clock input; and
a control input;
an access port selector compliant with a third protocol that differs from the first protocol and the second protocol, wherein the access port selector includes:
a control input;
a clock input;
a first enable output; and
a second enable output;
a first gating circuit including:
a first input coupled to a control input;
a second input coupled to the first enable output of the access port selector; and
an output coupled to the control input of the first access port;
a second gating circuit including:
a first input coupled to the control input;
a second input coupled to the second enable output of the access port selector; and
an output coupled to the control input of the second access port; and
an external control input to the device coupled to:
the control input of the access port selector;
the control input to the first gating circuit; and
the control input of the second gating circuit.