Newbie question on the EMIFA: I am using EMIF A to map to an external 16-bit Async RAM. Beside the A[0:12] and BA[0:1] lines, the DQM's can be used as byte selects. My question is, how are they used? I know that in 16-bit mode:
- the L137's BA[1] maps to the external device's A[0]
- the L137's A[0:12] maps to the external device's A[1:13] respectively
- the L137's BA[0] maps to the external device's A[22] (or some other high order address bit- not sure which)
Where do the DQM's map?
Thanks!