Despite dollar's firmness in part due to cross selling in yen, a break above strong resistance at 90.99 is needed to signal upmove from last month's low at 87.13 has resumed and bring a correction of medium-term decline towards 91.60/70.  
On the downside, only a breach of previous support at 89.75 would indicate temporary top has been formed instead and risk weakness to 89.10/20.