Problem with 1-wire protocole on OMAP3530

Hello,
I use a circuit Dallas DS2401 on the 1-Wire with an OMAP3530.
To send the pulse initialization I set the bits HDQ_CTRL_STATUS.INITIALISATION=1 and HDQ_CTRL_STATUS.GO=1.
On the oscilloscope I see that the pulse is sent indefinitely because the bits are not reset to 0 in HDQ_CTRL_STATUS.
Yet HDQ_CTRL_STATUS.PRESENCE is set to 1.
Does anyone know the solution?
Thank you