| 摘要 |
A system (20) has the capability to determine the termination status of a data-communication bus (22) therein. The system (20) includes a source of a bus signal (52) from a bus (22), a selectively activated current sink (54) that communicates with the source of the bus signal (52), with a detection activation input, and a source of detection signal (50) in communication with the detection activation input of the current sink (54). There is a source of a first reference voltage (58) and a source of a second reference voltage (60), the second reference voltage being less than the first reference voltage. A high-termination comparator (62) has an upper voltage input (74) that communicates with the source of the bus signal (52), a lower voltage input (72) that communicates with the source of the first reference voltage (58) and a logical high-termination output (70). A low-termination comparator (64) has a lower voltage input (72) that communicates with the source of the bus signal (52), an upper voltage input (74) that communicates with the source of the second reference voltage (60), and a logical low-termination output (76).
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