| 摘要 |
A PCB comprising two or more components, such as ICs, comprises drivers and receivers that facilitate communication of signals between the components. Signal terminations, such as series and AC terminations, are used to increase the integrity of signals transmitted between components. Advantageously, values of the terminations are determined using a computerized method comprising sequential adjustment of on-chip programmable resistors and/or capacitors on chips coupled to the PCB. Thus, the effect of various values of on-chip termination resistors and/or capacitors on signal integrity is actually tested on the PCB, rather than simulating using software, for example, in order to determine optimal termination values. Characteristics of on-chip programmable resistors and/or capacitors may be adjusted by writing values into registers of the corresponding chips. The termination testing may be performed at various temperature and humidity settings corresponding to expected use environments in order to observe signal integrity at specific use environments.
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