Patent ID: 7308629
Filing Date: 2007-12-11
Classification: G01R,G06F

Abstract:
1. An integrated circuit comprising: A. plural IEEE 1149.1 TAP domains, each domain having a TDI input terminal, a TDO output terminal, a TCK input terminal, and a TMS input terminal; B. a first external terminal on the integrated circuit; and C. an addressable TAP domain selection circuit, the selection circuit having a separate set of outputs and at least one input for each TAP domain, each set including a TDI output connected to a TDI input terminal, a TDO input connected to a TDO output terminal, a TCK output connected to a TCK input terminal, and a TMS output connected to a TMS input terminal, the selection circuit including a TDI/TDO terminal coupled to the first external terminal and including TDI/TDO circuitry for simultaneously inputting TDI data to the selection circuit and outputting TDO data from the selection circuit over the TDI/TDO terminal.