TM
Confidential and Proprietary
7
Steps to Read TBI Status and Receive Electrical Idle
Action Register
write MIIMCOM[Read Cycle] = 1
write MIIMADD[PHY Address] = value from TBIPA for dTSEC used
write MIIMADD[Register Address] = 1 for TBI Status Register (SR)
write MIIMCOM[Read Cycle] = 0 to ensure 0 -> 1 transition for non-stale data
write MIIMCOM[Read Cycle] = 1
read MIIMSTAT[PHY Status] for value in TBI SR. Check TBI SR[Link Status]. ‘0’ means
link is down.
read BnGCRm1[REIDL]where m means bank and n means lane. ‘1’ means link is down.
‘0’ means non-electrical idle state but could be receiving invalid symbols which
would result in a link down.