Almost every model of 'Ebay Module Camera' out there (perhaps with the exception of those which are UART based, but my guess would be their CMOS interface is the same, only there is an external clock already 'on board', require a 'heartbeat', or a steady external clock-in signal provided, even when 'powered up', before they will wake up and talk to you over i2c (needed for setting essential configuration registers and properly initializing the camera). [More on this particular topic in a later post]
However, once you've got the 'blood pumping', the first thing to do is establish a connection over i2c (the SDA/SDL lines). I was struggling with this quite a bit though as the official Micron datasheet suggests the hardware register for the device lies at 0x65. However, after numerous attempts at communicating over the bus I was simply not getting any response.
A bit perplexed, I finally resorted to using an i2C scanner script, which basically scans all 127 potential addresses in range and looks for a ping back, or response.
And, aha! Low and behold, finally a response (again, keep in mind if there is no steady clock signal going into the board at XCLK, this technique won't work)! Only the address is 0x5D, totally different from 0x65 specified in the datasheet.
Yet another reason to take a 'curious', rather than 'blind' approach to any components you purchase off EBay.