| 摘要 |
PROBLEM TO BE SOLVED: To provide a performance monitor circuit capable of specifying a sampling interval by clock cycle and a method thereof. SOLUTION: The performance monitor circuit and the performance monitor method are equipped with a buffer, stored a received packet in the transaction layer of a PCI Express in the buffer, and connected to the PCI express component transmitting the packet stored in the buffer. The performance monitor circuit includes: a first counter for measuring a data volume of the packet sent from the buffer; a second counter for measuring the number of clock cycles in which a packet exists in the buffer; a third counter for measuring the number of clock cycles in which a packet to be transmitted exists in the buffer, but it could not be transmitted; and a control circuit for performing control to repeat the measurement by first to third counters at a predetermined time interval. COPYRIGHT: (C)2009,JPO&INPIT
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