AN 701: Scalable Low Latency Ethernet 10G MAC using Intel Arria 10 1G/10G PHY

ID 683343
Date 11/06/2017
Public
Document Table of Contents

Changing Speed between 10G and 1G in 1000BaseX mode

The software can turn off auto speed detection and force the PHY to either 1G or 10G by writing a different value to the PHY register address at offset 0x12C0.
Table 1.   Register Value for Speed Change in 1000BaseX Mode in Intel® Arria® 10 Transceiver PHY IP
Value Description
0x01 Reset back to auto speed detection mode
0x11 Turn off auto speed detection and force the PHY to 1G
0x41 Turn off auto speed detection and force the PHY to 10G

Forcing Port 0 to 1000Base-X mode

  • Set Port 0 to 1000Base-X: write_32 0x02_52C0 0x11

Reset Port 0 to auto speed detection mode

  • Set Port 0 to 1000Base-X: write_32 0x02_52C0 0x01