Interfacing 8 bit wide EPROM to 68060?

[fiat1100d]

Is it possible to directly interface an EPROM with bus width of 8 bit to the 68060 or the fact that 68060 doesn't support "dynamic bus sizing" would be an issue?

[Oli_hd]

or the fact that 68060 doesn't support "dynamic bus sizing"

The 68060 has SIZ pins, these are used to show what size the current transfer will be, ie 8bit wide, 16 bit wide or 32bit wide, simply use these and you will be able to interface the eprom just fine.

[fiat1100d]

But when accessing the memory location where I need to put that EPROM, that is F00000 (hex) for having the code executed at boot time, will the 68060 know to make 8 bit reads or it will try to read 32-bit wide?
By reading the 68060 manual, I see that SIZx pins are to be used, together with A0 and A1, to select a byte in a 32-bit word... While for having 8 bit transfers I would need to connect A0 and A1 directly to the EPROM so that an increase by 1 of the address bus effectively points to the following memory location.

[MastaTabs]

You will have to put it on D31-D24 and you will want to access it byte wise with xxx.b instructions. It should be located at an even address. You will also have to care about generating a _ta signal and maybe also react on the _ts signal.

Maybe have a look at this:

N27P68k

[fiat1100d]

So I would have to modify all word and long word instructions of the code I have with byte ones, plus making some quite complex PLD...

For starting then maybe it is better if I try with 2 x 16 bit wide EPROMs and programming the (very little) code into them, so that I have a 32 bit wide bus and I don't need to modify the code. This is because I would like to try making a 68060 adapter for a 68040 board and I don't know if it will work at all, so it's better to start easy and then, if it works, make a better design :-)