Xc7z015clg485 and xc7z030sbg485, how to design the schematic to make them pin to pin compatible

Question

Hi all,
I have a schematic design case about pin to pin compatiblity with xc7z015clg485 and xc7z030sbg485. I compared xc7z015clg485pkg.txt and xc7z030sbg485pkg.txt. And found something different as below:
    1) 010 no HP bank, 030 have HP banks. In 010, H8    IO_0_34; In 030, H8    IO_0_VRN_34; In 010, R8    IO_25_34; In 030, R8    IO_25_VRP_34. So I assigned ddr3 pins to bank34 and bank35, and pulldown H8, pullup R8.
    2) In 010, V7 NC; In 030, V7 MGTAVTTRCAL_112; In 010, W3 NC; In 030, W3 MGTVCCAUX. 010 only have GTP, 030 only have GTX. So I followed the GTX rule to assign CML pins and power pins. That is to say, supplied V7 with 1.2V, and W3 with 1.8V. (to V7 and  W3 with preserved 0 ohm resistors)
    3) The PS pins of 010 are fully compatible with 030's ? (I assigned PL pins only with 030 pins definition)
    Is there something wrong with my above 3 schematic compatible designs ? Or others I had not considered.  Any question, could you please email to [email protected] or call me directly [phone] ? Thank you for your help and attention!
 

Answer 1

Yeah, I've read the official Toshiba statement on this. It is, to be frank, utter bulls**t.
Almost all socket M processors have thermal characteristics within a few degrees of each other, a cooling system designed for one of them will cool all of them just as well. Certainly one that is designed to cool a hotter CPU should be able to cope with a cooler one - as I said the Thermal Design Power of a T2300 is 2 degrees +lower+ than that of the T7200 the laptop shipped with. It is also an older chip, so there is no real excuse for the bios not being programmed to recognise it and cool it appropriately.
That statement should read like this:
"We have made sure that our laptops only work with the specific processor they ship with. This is to preclude you increasing the performance of the laptop yourself. If you want a faster laptop we want to force you to buy a whole new one from us instead of just getting a better chip and fitting it using simple tools."
In my case I'm actually putting a slower chip into the laptop but it won't work for the same reason: Toshiba have +deliberately+ crippled any upgrade/downgrade paths. Toshiba have tools to change the bios so it recognises the installed chip and runs the fan appropriately, but apparently they won't share them (see "real reason" above) - I'm hoping that somebody out there also has the tools and +is+ willing to share them.