Is NAND Flash an asynchronous memory?
Is NAND Flash an asynchronous memory?
(OP)
Hi everyone,
Is NAND Flash an asynchronous or synchronous memory? How can I tell?
From what I understand, synchronous memory requires a clock signal, but there isn't seem to be one on a NAND Flash... I could be wrong, though.
No, this is not a homework question.
Regards,
James
Is NAND Flash an asynchronous or synchronous memory? How can I tell?
From what I understand, synchronous memory requires a clock signal, but there isn't seem to be one on a NAND Flash... I could be wrong, though.
No, this is not a homework question.
Regards,
James





RE: Is NAND Flash an asynchronous memory?
TTFN
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RE: Is NAND Flash an asynchronous memory?
From the Blackfin's external memory bus description:
"The external bus interface unit (EBIU) provides glueless interfaces to external memories. The processor supports Synchronous DRAM (SDRAM) including mobile SDRAM. The EBIU also supports asynchronous interfaces such as SRAM, ROM, FIFOs, flash memory, and ASIC/FPGA designs"
Does it sound to you like the flash memory is asynchronous?
"If it weren't synchronous, how would you possibly use it?" Well, I am here to learn. Maybe you should too!
Regards,
James
RE: Is NAND Flash an asynchronous memory?
Which, would have something like:
READ ENABLE
The RE input is the serial data-out control, and when active drives the data onto the I/O bus. Data is valid
tREA after the falling edge of RE which also increments the internal column address counter by one.
TTFN
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RE: Is NAND Flash an asynchronous memory?
Dan - Owner

http://www.Hi-TecDesigns.com
RE: Is NAND Flash an asynchronous memory?
Glenn
RE: Is NAND Flash an asynchronous memory?
Any examples of those synchronous parts? Synchronous clocking of (comparatively) slow components seems like a tough row to hoe...
Dan - Owner

http://www.Hi-TecDesigns.com
RE: Is NAND Flash an asynchronous memory?
In NAND flash, many parts can operate in either synchronous or asynchronous mode. Check out the ONFI specification. And there is a CLK line when operating in synchronous mode.
Glenn
RE: Is NAND Flash an asynchronous memory?
They need a controller, much like a harddisk interface, as read/write operations are on whole sectors, not bytewise.
Benta.
RE: Is NAND Flash an asynchronous memory?
Best regards,
James