Xilinx IP Ethernet AVB Endpoint v2.4 UG492 - Manual (Page 170)

170 www.xilinx.com Ethernet AVB Endpoint User Guide
UG492 September 21, 2010
Appendix A: RTC Time Stamp Accuracy
X-Ref Target - Figure A-3
Figure A-3: Sampling Position Uncertainty
TIMING CASE 1
MAC Tx/Rx clock
toggle
RTC Reference
Clock
Q0
Q1
Q2
Take RTC Sample
clock boundary
MAC Tx/Rx clock
toggle
RTC Reference
Clock
Q0
Q1
Q2
Take RTC Sample
clock boundary
TIMING CASE 2
Sampling
uncertainty
Sample
Sample