exxos's Atari, Amiga & retro forum

PhilC wrote: 05 Jul 2020 10:04 I've been trying 16m x 16 chips and will try a 32m x 16 chips this week.

I presume a 1m x 8 would be wrong format?

1mb x 8 bit

exxos wrote: 05 Jul 2020 10:33
1mb x 8 bit

Its the x16 bit that I was trying to emphasise. I. Presuming that the tf536 ram needs to be in banks 16 bit wide but the 1mb x 8 is in 8 bit banks, so wouldn't work?

There's lot of chips that are pin compatible but the internal memory is laid out differently and im presuming that makes them incompatible.

This is based on experience from amiga and atari ram chips which I know are smaller, ie 256k x 4bits etc.

I have split this topic into its own thread as it drifted to far off topic.

terriblefire wrote: 05 Jul 2020 09:43 Next time i actually build a board i'll try some of this stuff. Might be a while

That would be great, cause Micron RAMs are pretty expensive ;)

PhilC wrote: 05 Jul 2020 10:51 Its the x16 bit that I was trying to emphasise. I. Presuming that the tf536 ram needs to be in banks 16 bit wide but the 1mb x 8 is in 8 bit banks, so wouldn't work?

The 030 CPU is 32 bit, which is why there are 2 RAM chips of 16 bit each.

@exxos yes I know which is why the x 8 bit ones won't work as they require 4 chips like in the TF534.

richx wrote: 04 Jul 2020 15:45

LADmachining wrote: 01 Jul 2020 16:43 I have re-formatted and combined the BoMs for TF534 and 536, and included Mouser, Digi-Key and RS stock codes.

https://docs.google.com/spreadsheets/d/ ... 2098118341

Anthony

On row 8, the Digikey/Mouser part numbers are pointing to wrong 1Mx8 size memory.

W9825G6KH-6-ND seems to be the cheapest memory on Digikey.

Thanks! I have corrected this now.

Anthony

Interesting that the Winbond chips are having issues, they're all 4M x 16 bits x 4 banks standard SDRAM, >100MHz. I guess there're some subtleties.

Anyone tried the Alliance or ISSI versions? Those are still almost half the price of the Microns, notably the AS4C16M16SA-6TCN (166MHz) and
IS42S16160J-7TLI (143MHz).

Guys,

Whatever chip you choose the price will double in a month. When I first specced the micron it was £2.50 a chip. They ramp up the price based on interest. They have algorithms specifically for this.

The micron is the only one with a verilog compact model. Hence it’s the only one I support

Only winbond W9825G6KH-5 200MHz don't want to work with TF536 card