Hi Tony,
I'm building an external Flash ROM reader/writer/programmer to plug into an A500 (look, I've got one already, OK?). Most of the bus signals are pretty mundane, but what about the UDS and LDS signals? LDS means Low Data Select (bits 7:0), UDS means Upper Data Select (bits 15:
.
When do I need to use them? Is it during a Write (Byte) operation, or a Read (Byte) operation, or when?
I'm not too sure about the exact connections of your system but I can add some general advice. If you select/enable the programmer using a chip select (CS) line then you could ignore UDS/LDS.
Have you got a circuit of your programmer?
