Other Parts Discussed in Thread: TMDS64EVM
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器件型号： TMDS64EVM
您好：
我使用的是 TMDS64EVM 板。
我已经使用最新的 Processor SDK (11.01.05.03) 在 TMDS64EVM 上测试 PTP。
Meinberg LANTIME M1000 用作 PTP 主控。
不过、我发现 TMDS64EVM 产生了一个主失调电压、与 TMDSIDK574 相比、抖动明显更高。
以下是从 TMDSIDK574 电路板获得的结果。
root@am57xx-evm:/# ptp4l -A -2 -H -i eth1 -m -q
ptp4l[35096.021]: selected /dev/ptp0 as PTP clock
ptp4l[35096.110]: port 1 (eth1): INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[35096.111]: port 0 (/var/run/ptp4l): INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[35097.346]: port 1: peer detected, switch to P2P
ptp4l[35097.550]: port 1: new foreign master ec4670.fffe.0aa5b3-1
ptp4l[35101.550]: selected best master clock ec4670.fffe.0aa5b3 on port 1
ptp4l[35101.550]: selected best master clock ec4670.fffe.0aa5b3
ptp4l[35101.550]: updating UTC offset to 37
ptp4l[35101.550]: port 1 (eth1): LISTENING to UNCALIBRATED on RS_SLAVE
ptp4l[35103.136]: master offset 8 s0 freq +578 path delay 217
ptp4l[35104.136]: master offset 5 s2 freq +575 path delay 216
ptp4l[35104.136]: port 1 (eth1): UNCALIBRATED to SLAVE on MASTER_CLOCK_SELECTED
ptp4l[35105.136]: master offset 7 s2 freq +582 path delay 215
ptp4l[35106.136]: master offset 12 s2 freq +589 path delay 215
ptp4l[35107.136]: master offset -1 s2 freq +580 path delay 215
ptp4l[35108.136]: master offset -5 s2 freq +575 path delay 216
ptp4l[35109.136]: master offset -10 s2 freq +569 path delay 217
ptp4l[35110.136]: master offset -2 s2 freq +574 path delay 217
ptp4l[35111.136]: master offset 6 s2 freq +581 path delay 217
ptp4l[35112.136]: master offset 5 s2 freq +582 path delay 216
ptp4l[35113.136]: master offset 1 s2 freq +580 path delay 216
ptp4l[35114.136]: master offset 0 s2 freq +579 path delay 216
ptp4l[35115.136]: master offset -11 s2 freq +568 path delay 217
ptp4l[35116.136]: master offset -1 s2 freq +575 path delay 217
ptp4l[35117.137]: master offset 12 s2 freq +587 path delay 216
ptp4l[35118.137]: master offset 4 s2 freq +583 path delay 216
ptp4l[35119.137]: master offset -5 s2 freq +575 path delay 216
ptp4l[35120.137]: master offset -9 s2 freq +570 path delay 216
ptp4l[35121.137]: master offset 0 s2 freq +576 path delay 216
ptp4l[35122.137]: master offset 9 s2 freq +585 path delay 216
ptp4l[35123.137]: master offset -3 s2 freq +576 path delay 216
ptp4l[35124.137]: master offset -4 s2 freq +574 path delay 216
以下是从 TMDS64EVM 电路板获得的结果、使用与 TMDSIDK574 相同的配置。
root@am64xx-evm:~# ptp4l -A -2 -H -i eth1 -m -q
ptp4l[16159.352]: selected /dev/ptp2 as PTP clock
ptp4l[16159.375]: port 1 (eth1): INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[16159.376]: port 0 (/var/run/ptp4l): INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[16159.376]: port 0 (/var/run/ptp4lro): INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[16160.312]: port 1 (eth1): new foreign master ec4670.fffe.0aa5b3-1
ptp4l[16160.805]: port 1 (eth1): peer detected, switch to P2P
ptp4l[16164.312]: selected best master clock ec4670.fffe.0aa5b3
ptp4l[16164.312]: port 1 (eth1): LISTENING to UNCALIBRATED on RS_SLAVE
ptp4l[16164.898]: master offset 17484 s0 freq -2187 path delay 171
ptp4l[16165.898]: master offset 17899 s2 freq -1772 path delay 171
ptp4l[16165.899]: port 1 (eth1): UNCALIBRATED to SLAVE on MASTER_CLOCK_SELECTED
ptp4l[16166.898]: master offset 18058 s2 freq +16286 path delay 170
ptp4l[16167.898]: master offset 598 s2 freq +4243 path delay 170
ptp4l[16168.898]: master offset -4709 s2 freq -885 path delay 170
ptp4l[16169.899]: master offset -4628 s2 freq -2216 path delay 170
ptp4l[16170.899]: master offset -3110 s2 freq -2087 path delay 170
ptp4l[16171.899]: master offset -1673 s2 freq -1583 path delay 170
ptp4l[16172.899]: master offset -818 s2 freq -1230 path delay 170
ptp4l[16173.899]: master offset -292 s2 freq -949 path delay 170
ptp4l[16174.899]: master offset -156 s2 freq -901 path delay 170
ptp4l[16175.899]: master offset -431 s2 freq -1222 path delay 170
ptp4l[16176.899]: master offset -894 s2 freq -1815 path delay 170
ptp4l[16177.899]: master offset 8 s2 freq -1181 path delay 170
ptp4l[16178.899]: master offset -602 s2 freq -1788 path delay 170
ptp4l[16179.899]: master offset -819 s2 freq -2186 path delay 170
ptp4l[16180.899]: master offset 493 s2 freq -1120 path delay 170
ptp4l[16181.899]: master offset 759 s2 freq -706 path delay 170
ptp4l[16182.899]: master offset -833 s2 freq -2070 path delay 169
ptp4l[16183.899]: master offset -851 s2 freq -2338 path delay 169
ptp4l[16184.899]: master offset -664 s2 freq -2406 path delay 169
ptp4l[16185.899]: master offset -500 s2 freq -2442 path delay 170
ptp4l[16186.899]: master offset 348 s2 freq -1744 path delay 170
ptp4l[16187.899]: master offset 450 s2 freq -1537 path delay 169
ptp4l[16188.899]: master offset -234 s2 freq -2086 path delay 169
ptp4l[16189.899]: master offset -619 s2 freq -2541 path delay 170
ptp4l[16190.899]: master offset -535 s2 freq -2643 path delay 170
ptp4l[16191.899]: master offset -108 s2 freq -2377 path delay 170
ptp4l[16192.899]: master offset 67 s2 freq -2234 path delay 170
ptp4l[16193.899]: master offset 402 s2 freq -1879 path delay 170
ptp4l[16194.900]: master offset 399 s2 freq -1761 path delay 170
ptp4l[16195.900]: master offset 136 s2 freq -1905 path delay 170
ptp4l[16196.900]: master offset 173 s2 freq -1827 path delay 170
ptp4l[16197.900]: master offset 164 s2 freq -1784 path delay 170
ptp4l[16198.900]: master offset 58 s2 freq -1841 path delay 170
ptp4l[16199.900]: master offset -166 s2 freq -2047 path delay 170
ptp4l[16200.900]: master offset -253 s2 freq -2184 path delay 170
ptp4l[16201.900]: master offset 222 s2 freq -1785 path delay 169
如何减少或缓解这种抖动？
此致、
SoonRyul Nam.
