Integrity check of measured signal trace data
A method of monitoring signals is disclosed, wherein a plurality of command signals and address signals are consecutively expressed, as a measurement target. The method includes setting a strobe timing that has a predetermined initial value; calculating an error rate by monitoring the plurality of command signals, in accordance with the strobe timing; monitoring the plurality of address signals, and calculating a burst rate from a difference between the consecutive plurality of address signals, in accordance with the strobe timing; identifying timing where the calculated error rate and calculated burst rate are both optimized; and in the event the timing where both the calculated error rate and calculated burst rate are optimized cannot be identified, altering a predetermined value of the set strobe timing, and repeating the calculating, monitoring, and identifying.
1. A method of monitoring signals, wherein a plurality of command signals and address signals are consecutively expressed, as a measurement target, the method comprising:
setting a strobe timing that has a predetermined initial value;
calculating an error rate by monitoring the plurality of command signals, in accordance with the strobe timing;
monitoring the plurality of address signals, and calculating a burst rate from a difference between the consecutive plurality of address signals, in accordance with the strobe timing;
identifying timing where the calculated error rate and calculated burst rate are both optimized; and
in the event the timing where both the calculated error rate and calculated burst rate are optimized cannot be identified, altering a predetermined value of the set strobe timing, and repeating the calculating, monitoring, and identifying.
2. The method according to claim 1 , wherein the determination of whether or not the error rate is optimized is made using a bathtub curve with the strobe timing value on the lateral axis, by determining whether the error rate is minimized at a center of the bathtub curve.
3. The method according to claim 1 , wherein the determination of whether or not the burst rate is optimized is made using a curve with the strobe timing value on the lateral axis, by determining whether the burst rate is maximized at a center of the curve.
4. The method according to claim 1 , wherein a signal expressed by dividing the plurality of command signals and plurality of address signals that are monitored as the measurement target, is a pattern of a signal that a CPU of a computer has accessed a main memory of the computer.
5. The method according to claim 1 , wherein the signal that is the measurement target is to be synchronized and calibrated at the nanosecond level.
6. A method of monitoring a signal as a measurement target, where a plurality of command signals and address signals are consecutively expressed, the method comprising:
setting a strobe timing that has a predetermined initial value;
calculating an error rate and a burst rate by monitoring a plurality of command signals and a plurality of address signals, in accordance with the strobe timing;
identifying timing where the calculated error rate and calculated burst rate are both optimized as a target; and
in the event the timing where both rates are optimized cannot be identified, sweeping a predetermined value of the set strobe timing, and repeating the setting, calculating and identifying.
7. The method according to claim 6 , wherein the determination of whether or not the error rate is optimized is made using a bathtub curve with the strobe timing value on the lateral axis, by determining whether the error rate is minimized at a center of the bathtub curve.
8. The method according to claim 6 , wherein the determination of whether or not the burst rate is optimized is made using a curve with the strobe timing value on the lateral axis, by determining whether the burst rate is maximized at a center of the curve.
9. The method according to claim 6 , wherein a signal expressed by dividing the plurality of command signals and plurality of address signals that are monitored as the measurement target, is a pattern of a signal that a CPU of a computer has accessed a main memory of the computer.
10. The method according to claim 6 , wherein the signal that is the measurement target is to be synchronized and calibrated at the nanosecond level.