04-13-2009 06:33 AM
i use gpt v1.9 ip core base on st95t. TILE0_PLLLKDET_OUT and TILE0_RESETDONE0_I is 1 ;but i foud txoutclk_dcm0_locked_i
rxrecclk_dcm1_locked_i and rxrecclk_dcm2_locked_i sometime is sometime 0 and i do "rxrecclk_dcm0_i <= not TILE0_PLLLKDET_OUT.
what can i do else? thanks
04-13-2009 07:49 PM
Is this problem seen on board or in simulation?
Please confirm if TXOUTCLK and RXRECCLK are stable and the DCM parameters are correct.
Is this design created by GTP Wizard? Did you change anything in the generated source codes?
02-19-2010 10:03 PM
I hope this problem is not related to GTP. This is might be problem with DCM.
Check VCCAUX power supply noise and the status signals of DCM.