Wanted: 68 - 030 / PQFP Source

[Zetr0]

Hello there forum chummies,

I have a project coming up in a month or two, and I am on the lookout for a source of 68030's in a PQFP package, (thats the smd - soldered to the board type)

I have tried the regular haunts, and alas all i can find is the PQFP 020's (the ones in the A1200's)

clock factor isn't a worry 20mhz + would be fine any ideas anyone.

[alexh]

It might have something to do with the fact they never made PQFP 68030?

You can buy 132-pin CQFP MC68030FE33C for about $50 in lots of places.

There is not much price difference between a MC68030FE16C (slowest) and an MC68030FE33C (fastest)

[Zetr0]

@alexh

indeed, CQFP, thanks for the correcto

any linkies that would be nice too

[alexh]

These guys are the most expensive place to buy anywhere, but they have their price online. For the best prices you need to ask for quotes.

MC68030FE20C $49

[Zetr0]

Thanks Alexh

LOL the CQFP explains why i couldn't find it at digi-key before ....

did they ever release a QFP package of the 040 and or 060 ?

[alexh]

They still make CQFP 040's (MC68040FE40A) and AFAIK they never made QFP 060's (even though there is a pinout diagram for one on Freescale's website).

Why the interest?

[Zetr0]

theres just a project that (could) be coming up in a couple of months and I am looking out for a source for components

[alexh]

Some people have been saying chips that operate at a 5v I/O are practically useless for MiniMig without extra electonics.

Dont believe them, a spartan III will connect to an MC68030FE40 with no problem what so ever

[Zetr0]

@alexh

as far as I am aware this project is nothing to do with the minimig, directly. or indirectly that i know of...

[alexh]

Ah, A600 accelerator eh?

Seems stoopid to do one after Jens Schoenfeld has already done one. Shame he's sitting on it.

[Zetr0]

@Alexh

In complete honesty I have sooo many projects at the moment, both professional and personal, so I don't want to get anyones hopes up as time... ohh time is sooo precious...

I have a few PGA packages of 030 / 040 and 060's as well as a working design for the LUCAS (020 + 68881) project that would interface well with the A600, I also have schematics from the PAK68 that allows for an 030 add on, i would eventually like to interface the 040 / 060 but for this i want QFP versions for testing assuming they were cheap enough.

indeed, I have a fair few schematics from Freescale and I had noticed the 060 QFP packages alas I had never seen or heard of any, but I had heard about 040's albeit being used in conjunction with DSP telephony equipment but this was a while back...

on a sub note with the MiniMig, when i get a working prototype (020 + fast ram) then I may re-develop it either into the MiniMig board or as a clip on / over device.

again this is all with time pending..... and well times pretty much a hot commodity so no promises...

[alexh]

Why QFP? Do you think them easier to solder? PCB limitations?

I wish I knew the in's and out's of PCB design. I've never done anything that wasnt just a "wiring diagram".

I never know when to use pullup's (termination etc.), or capacitors etc. I certainly dont know when to use type XXX 1uf capacitor vs type yyyy 1uf capacitor, values sometimes yes, types no.

Certainly couldnt do a power supply bit with regulators etc.

[Zetr0]

@alexh

theres plenty of help and support online

books are good for reference but making it really does improve ones understanding on how a circuit manipulates and stores voltages and currents.

if you want i will post some resources on circuit design and development.

[BinoX]

I would quite like to see some new A2000 or A500/CDTV CPU upgrades too... Would it be hard to re-do your designs to fit each of those?

Any references on where to learn stuff like that?
I have a basic understanding of electronics... but I'd like to expand

[Zetr0]

lots and lots and lots of reading...

learning comes from lots of examples I will drag some sources up. the trick is when it gets heavy... and it will get heavy... its time to get up and build something..

I picked up micro-controllers at school and there is where my level was / is kinda... but like anything learning how to manipulate signals for what you want it to achieve is something that the books will tell you... and then you can formulate some nice maths to go with it.... it has lots of squiggles like the ones on my comp-science degree ooohh... some heads aches were had there....

I will say though, that no book could teach you everything. experience can only passed on... these last few months I have been learning Logic devices and its implementation and have been starting with PAL's and GAL's, these are not so scary... when you know what kind of signal you need, then extrapolating it from what you have is 80% reference and 30% memory

a classic example is the CDAC signal on the amiga. this is a common signal used with the custom chips for timing and XOR'ing process but not available to the 68000 socket, so the choice is to run a fly-over to where that signal is, or generate it some how.

knowing what the CDAC is, requires reference and from this you figure out its 1 tenth of a 7Mhz clock (0.7m) pulse, so the complicated bit is figuring it out with regards logic propagation delays (around the 4ns) and capacitance will play a factor in generating a stable and usable signal. the more logic / circuit devices you implement the more time is taken up in the propagation delay and hence the math more complicated.

as you can imagine there can be a lot of maths involved in developing and redesigning so i kinda stick to established norms... pretty much most circuits you will need have been developed before so its a case of researching them... unless you really want to do the math... which can be fun too.

then sometimes i get so excited i forget something, this is why i hold up the designs for the scrutiny of others, to see the flaws of the design or the errors, in this respect i cannot thank people enough for finding them.

[Zetr0]

for me at least I am developing CPU and Fast Memory upgrades based on existing work such like the LUCAS and FRANCIS, I am also using the PAK68 as a resource too.

The designs i am doing are based around the 68000 socket, this maximizes the usability of the design in A500 / A1000 and A2000, from this I can also easily extrapolate an A600 design.

I am hoping to have an 020 + FPU prototype for A500 / A600 by Christmas, I also hope to have a Fast Ram add on if not as well but soon after...

but as I mentioned... its all down to time.... i have so little....

[BinoX]

Cool... I'll have one I'll CDTV test it for ya too hehe

Any chance of modifying the design for an A2000 86 pin cpu slot connector.

[Zetr0]

@Binox

where there is a will

truth is anything that is documented can be done... I am limited on size of my prototypes but i don't mind building sandwich boards alas, I would also need an A2000 to go with that too

I have an A500 / A600 and an A1200...

If i could find the specs to the ZIV ports on the winner board one could easily adapted for that i reckon

I have been looking to getting a source of A3000 / A4000 cpu connectors alas so far the best deal is at $9 for each connector ($18 a male/female set) and a minimum order of 50 units (and that 50 male OR female units) it gets expensive as you can see.

[BinoX]

Yeah.. I've been trying to source 86 pin edge connectors so I can build some simple A500 sidecar expansions...

But no luck finding any...

Also looking for 100 pin edge connectors (Zorro slots) if u know of a good supplier

[alexh]

http://www.adam-tech.com/pg130.pdf

Last time I looked they were £1.06 each but they were a minimum order of 500.

Think you can find enough like minded people?

If not, with enough balls and a confident voice on the phone, together with a company email address you should be able to blag a couple of samples

I got my CD32 connectors (182-pin MCA) from them.

http://www.adam-tech.com/pg132.pdf