IEEE P1149.1.1

Test Access Port for Connection to Test Data Registers


Scope: Enhances the 1149.1 standard and defines the signals on the "other side" of the TAP Controller that are needed to operate Test Data Registers (TDR's). These signals include the functions or operations of
Select, Shift, Capture, Reset, TCK, TDI, and TDO. Since these signals and their operations make up the control and data interface of a TDR, this effort has been called TDRI or JTDRI (JTAG Test Data Register Interface).

...defining the "other side of the TAP"

The original JTAG committee left much of the “other side of the TAP” up to the designer, but as more test standards are developing for internal testing, more guidance is needed.

CPU & FPGA Support

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