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US 11,693,055 B2Granted
Direct scan access JTAG
AssigneeTexas Instruments Incorporated
InventorLee D. Whetsel
Life of this patent
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Abstract
The present disclosure describes novel methods and apparatuses for directly accessing JTAG Tap domains that exist in a scan path of many serially connected JTAG Tap domains. Direct scan access to a selected Tap domain by a JTAG controller is achieved using auxiliary digital or analog terminals associated with the Tap domain and connected to the JTAG controller. During direct scan access, the auxiliary digital or analog terminals serve as serial data input and serial data output paths between the selected Tap domain and the JTAG controller.
Claims17
An integrated circuit comprising:
- (a) core circuitry;
- (b) tap domain circuitry coupled to the core circuitry, the tap domain circuitry including a test data input, a test data output, a test clock input, a test mode select input, control outputs, a switch control connection, and multiplexer circuitry, wherein the multiplexer circuitry has an instruction data input, a data register data input, a control input, and a multiplexer output, and wherein the multiplexer output is coupled to the test data output;
- and
- (c) auxiliary circuitry separate from the tap domain circuitry, the auxiliary circuitry including analog circuitry and having an auxiliary input, an auxiliary output, and a control input coupled to the control outputs, wherein the auxiliary circuitry is operative to be enabled or disabled based on the switch control connection.
1 more element
Dependencies are inferred from the claim text.