US 12,416,670 B2
Falling clock edge JTAG bus routers
Lee D. Whetsel, Parker, TX (US)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed on Jun. 19, 2023, as Appl. No. 18/211,369.
Application 18/211,369 is a division of application No. 17/158,438, filed on Jan. 26, 2021, granted, now 11,680,985.
Application 17/158,438 is a division of application No. 16/776,667, filed on Jan. 30, 2020, granted, now 10,935,601, issued on Mar. 2, 2021.
Application 16/776,667 is a division of application No. 16/228,067, filed on Dec. 20, 2018, granted, now 10,585,144, issued on Mar. 10, 2020.
Application 16/228,067 is a division of application No. 15/499,362, filed on Apr. 27, 2017, granted, now 10,197,628, issued on Feb. 5, 2019.
Application 15/499,362 is a division of application No. 15/179,117, filed on Jun. 10, 2016, granted, now 9,671,463, issued on Jun. 6, 2017.
Application 15/179,117 is a division of application No. 14/054,039, filed on Oct. 15, 2013, granted, now 9,395,412, issued on Jul. 19, 2016.
Application 14/054,039 is a division of application No. 12/968,966, filed on Dec. 15, 2010, granted, now 8,589,714, issued on Nov. 19, 2013.
Claims priority of provisional application 61/288,055, filed on Dec. 18, 2009.
Prior Publication US 2023/0333163 A1, Oct. 19, 2023
Int. Cl. G01R 31/317 (2006.01); G01R 31/3177 (2006.01); G01R 31/3185 (2006.01)
CPC G01R 31/318597 (2013.01) [G01R 31/31723 (2013.01); G01R 31/3177 (2013.01); G01R 31/318552 (2013.01); G01R 31/318555 (2013.01); G01R 31/318558 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A device comprising:
a first test access port (TAP);
a second TAP;
a test clock (TCK) terminal configurable to receive a TCK signal;
a test mode select (TMS) terminal; and
a router circuit coupled to the first TAP, the second TAP, the TCK terminal, and the TMS terminal, wherein the router circuit includes an inverter circuit coupled to the TCK terminal and configurable to invert the TCK signal, and wherein the router circuit is configurable to:
receive a TCK signal via the TCK terminal, wherein the TCK signal received at the TCK terminal includes a series of alternating active edges and inactive edges; and
select the second TAP based on communication received from the TMS terminal at an inactive edge of the TCK signal received at the TCK terminal.