| 摘要 |
<p>A method for sequentially accessing circuit nodes in an IEEE 1149.4 compatible mixed-signal circuit having a boundary module associated with each circuit node, analog busses for accessing the circuit nodes and connecting analog bus pins and boundary modules and the boundary modules having analog switches for selectively accessing the busses, comprises initializing the boundary modules with logic values including an analog switch enabling logic value for enabling a switch associated with a first node and enabling the switch; monitoring or driving the first node via the analog busses; suppressing capture mode in each boundary module; and for each additional circuit node to be accessed, shifting the switch enabling logic value from the boundary module containing the logic value to the boundary module associated with the next signal node to be accessed, enabling a switch associated therewith; and monitoring or driving the next signal node via the analog bus.</p> |
