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AR# 55360

Ethernet 1000BASE-X PCS/PMA or SGMI v12.0, v11.5 and v11.4 - mmcm_locked not connected to GT tx_startup_fsm and rx_startup_fsm


If using the Ethernet 1000BASE-X PCS/PMA or SGMII core v12.0, v11.5 and v11.4, mmcm_locked is not connected to GT tx_startup_fsm and rx_startup_fsm. This could cause the GT reset logic to complete before the MMCM has locked and result in the link not coming up at power up or after a reset.


To resolve this issue, in the core_name_gtwizard_init.v[hd] file, map the signal GT0_TXUSERRDY_IN to the MMCM_LOCK input pin of gt0_txresetfsm_i and gt0_rxresetfsm_i. These inputs are currently tied to logic Vcc.

This is scheduled to be fixed in v13.0 of the core scheduled to be released in the 2013.2 design tools.

Linked Answer Records

Master Answer Records

AR# 55360
Date Created 04/03/2013
Last Updated 05/17/2013
Status Active
Type General Article
  • Ethernet 1000BASE-X PCS/PMA or SGMII