06-14-2011 02:08 AM
I suggest you to go for the Manual Routing because for memories there are few guidelines which you need to follow. That cannot be set by tools automatically.
Few guides which as to be followed.
1. Data Lines Track length and width must be same.
2.Address lines Impedance mismatch can be taken cared.
3. Clk Signals as to be routed from the Ground plane to avoid the signal integrity issues.
4. Control signals (CKE,RAS,CAS ,.........) as to be routed properly. considering that 90 degress bending is not allowed.