Computing apparatus and margin measurement method
A computing apparatus, includes a first apparatus and a second apparatus, a differential transmission line that couples the first apparatus and the second apparatus to each other, a noise application unit that applies noise to the differential transmission line, a noise control unit that controls the noise application unit, and a margin measurement unit that measures an occurrence frequency of communication error between the first apparatus and the second apparatus.
1. A computing apparatus, comprising:
a first apparatus and a second apparatus;
a differential transmission line that couples the first apparatus and the second apparatus to each other;
a current voltage source that applies noise to the differential transmission line; and
a processor coupled to a memory storing instructions to permit the processor to function as:
a noise control unit that controls the current voltage source; and
a margin measurement unit that measures an occurrence frequency of communication error between the first apparatus and the second apparatus; and
a crosstalk testing wiring that is disposed in parallel with a pair of signal lines included in the differential transmission line, over a predetermined section thereof,
wherein a distance from the crosstalk testing wiring to a first signal line making up the pair of signal lines is different from a distance from the crosstalk testing wiring to a second signal line making up the pair of signal lines, and
wherein the current voltage source applies voltage to the crosstalk testing wiring.
2. The computing apparatus according to claim 1 , further comprising:
a storage device in which a result of measurement by the margin measurement unit is recorded.
3. The computing apparatus according to claim 1 ,
wherein the processor performs notification of a result of measurement by the margin measurement unit.
4. The computing apparatus according to claim 1 , wherein
the current voltage source applies voltage or current to at least one of a pair of signal lines included in the differential transmission line.
5. A margin measurement method that is executed by a computing apparatus, including a first apparatus, a second apparatus, and a differential transmission line that couples the first apparatus and the second apparatus to each other, the margin measurement method comprising:
applying noise to the differential transmission line; and
measuring an occurrence frequency of communication error between the first apparatus and the second apparatus,
wherein a crosstalk testing wiring is disposed in parallel with a pair of signal lines included in the differential transmission line, over a predetermined section thereof,
wherein a distance from the crosstalk testing wiring to a first signal line making up the pair of signal lines is different from a distance from the crosstalk testing wiring to a second signal line making up the pair of signal lines, and
wherein a voltage is applied to the crosstalk testing wiring.