Nor Flash Forum Discussions

Hi,

could anyone help with the acceptable voltage levels for AM29F040B-55JF. I think this part is obsolete now. But need this details. Vcc is 5V but the /CS, /RD, /WR & Addr lines are at 3.3V. Datasheet specifies DC characteristics for both TTL/NMOS & CMOS. But its not clear whether the same device can work on both levels (or) we need to choose a different part number. IF its same device, is there any HW configuration to be done to accept TTL logic signals.

Thanks & Regards

Muthu A

Hi,

I am using an MCU (ATSAME53J20A-AF) together with the S70FL01GSAGMFV010 NOR flash chip.

I want to have the S70FL01GSAGMFV010 be seen as a mass storage device by a USB host (any advice / examples / re-usable code ?).

Secondly I need advice / examples on memory management (i.e. bad sector management) for the NOR flash.

Any examples / advise / re-usable code would be highly appreciated ?

I am using S29GL032N.

Most the operations (block erasing, write, chip erasing) require a command sequence by writing some specific values to some specific addresses. For example, to ease a block starting at 0x10000, we need :

write 0x555  with 0xAA

write 0x2AA with 0x55

write 0x555 with 0x80

write 0x555 with 0xAA

write 0x2AA with 0x55

write 0x10000 with 0x30

This works.

But today I accidently find the operation still work if I change some MSBs of the address to 1 instead of 0.  For example, the below sequence:

write 0xFFD55  with 0xAA

write 0xFFAAA with 0x55

write 0xFFD55 with 0x80

write 0xFFD55 with 0xAA

write 0xFFAAA with 0x55

write 0x10000 with 0x30

It looks like that only bit 0~10 matter. Is this true？ Is this a common feature for NOR flash?

How might a NOR Flash component be damaged or degraded if Vio exceeds Vcc?

To know if parts should be replaced, is there any data on the magnitude or duration of Vio exceeding Vcc before degradation or damage occurs?

For Cypress S29GL01GT/S29GL512T parallel NOR Flash:

Section 10.4.2 of the Datasheet shows Vio can exceed Vcc by 200mV: "Vio = 1.65V to Vcc + 200mV"

Section 10.4.3 of the Datasheet then states, "During power-up or power-down VCC must always be greater than or equal to VIO (VCC  VIO)."

Reference:

Datasheet @ https://www.cypress.com/file/218336/download

Re: In S29GL512T, during flashing do we need to follow power sequencing? since it has two voltages (I/O-1.8v and Core-3.…

NOR Flash FAQs - KBA222273

Greg

We are using nor flash S29GL01GP11TFI010 in one of our projects.We came to know that  unavailability of the S29GL01GP11TFI010 from  distributors. Please confirm the product status of the same. If the product is  in EOL . Please suggest alternate part for above.

Is my understanding of the Automatic Sleep Mode correct? The device enters Automatic Sleep Mode if address doesn't change for 140nS, and remains in automatic sleep mode for 8µs before returning to Standby. Can the device leave Automatic Sleep Mode any sooner than 8µs?