STM32F7508-DK NRND'd

[waclawek.jan]

https://www.st.com/en/evaluation-tools/stm32f7508-dk.html is NRND'd.

It's no huge loss, though, as it's an identical board (MB1911) to the 'F743 'F746 Disco (thanks, Clive!) which is still Active.

JW

[Tesla DeLorean]

F746G-DISCO

​Probably the screen, or that Value Line is a waste of a die in the current market

[STOne-32]

F750 MCU has only 64KBytes of Flash vs F746 with 1Mbytes of Flash. putting F7508-DK in NRND will help us to optimize the availability, maintenance and inventory for the 3 Others STM32F7-DK .

[waclawek.jan]

Well, there was not much sense to come out with it at the first place... I guess that was at the spur of the time, to highlight the possibility to have a lower-cost alternative to the "full-blown" 'F7s while running most of the code from QSPI FLASH - although, in light of this motive, the funny thing is, that both discos sold at the same price... ;)

As I've said above, no harm in this. Unlike the 'L476 disco, for which there's no replacement...

Did I mention that IMO ST sort of lost it with the Discos, generally? Not calling them Disco nor Discovery anymore is telling, too...

JW

[Ozone]

> Did I mention that IMO ST sort of lost it with the Discos, generally? Not calling them Disco nor Discovery anymore is telling, too...

I would agree.

Including the software support, that got bigger, but not better. Which finally convinced me to resort to direct-register-access code now.

I don't understand the Flash argument either.

Wouldn't the F750 with the smallest Flash not be the "last sellable fallback" ?

AFAIK Flash still occupies the most die area, and thus has the highest process failure likelihood.

[Tesla DeLorean]

Well the usual case for ST to offer the Low Flash options / pricing stratification is that it takes significantly less time on the test equipment, and increasing the unit throughput.

The equipment is expensive, and so spending multiple seconds to erase, write and erase a 1MB part is going to be very significant. Price stratification allows sales to get design wins over competitors, or to sell more ST parts into a BoM. A $2 part that meets the customer's needs and removes a competitor is better than loosing a $20 sale. But in the current market the $20 part might now be an easier and more profitable sale.

I'm not sure what the failure rate is for STM32 die, and I don't know if there is any ability to remap the flash array such that they can find a good section.

Yes, the flash array will take a lot of space, the better route would be a die shrink with a smaller array, and many more die on the wafer, but there's also a lot of testing, validation and characterization involved. Not to mention the planning, scheduling, and inventory. I think the F722 was the smaller part/die.

With the advent of QSPI XIP there's opportunity to have flexibility in part sourcing, and very large FLASH, that can't be accommodated on-chip economically.

Value Line also gives the opportunity to disable externally sourced IP and things which must be licenced (patent pool, etc). ie USB, CAN, DSI, Ethernet, Crypto etc. Remove cost of those, and test time costs.