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For s26ks hyperflash, word program only run below 50MHz, write buffer program can run in higher frequency. I have some question about that:
1. In burst word program( write multiple words in a single command), data will be written into buffer or not? In RTL simulation using s26ks flash model, I found data will be written into buffer first.
2. Write buffer program using "addr0->word->addr1->word->...." sequence, but word program using "addr->word->word->word..." sequence, which means even write buffer program can run in higher frequency, it maybe transfer lower than word program. So why use write buffer program?
3. Write buffer program has less program time than word program or not?
4. How to understand the picture below? Is that mean when writing single word using word program, it takes 270us typically? when writing 512 bytes using buffer program, it only takes 475us typically?
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Memory Hyper Flash
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Please see the response to your questions below -
- Data is stored to buffer during burst write operation, then once CS# is de-asserted, the data in buffer is programmed to Flash array.
- Because write buffer program sequence is compatible with parallel NOR Flash. HyperFlash uses parallel NOR Flash based command set. The burst word program is a superset of single word program in parallel NOR flash. The write buffer program is used for software (Flash memory driver) compatibility between HyperFlash and parallel NOR Flash.
- If you are programming the same number of words by write buffer program and burst word program, the program time is same.
- Yes, your understanding is correct. Programming full-512 byte at a time is most efficient. In other words, if you program only one word by write buffer program, it takes 270us in typical.
Regards.
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Please see the response to your questions below -
- Data is stored to buffer during burst write operation, then once CS# is de-asserted, the data in buffer is programmed to Flash array.
- Because write buffer program sequence is compatible with parallel NOR Flash. HyperFlash uses parallel NOR Flash based command set. The burst word program is a superset of single word program in parallel NOR flash. The write buffer program is used for software (Flash memory driver) compatibility between HyperFlash and parallel NOR Flash.
- If you are programming the same number of words by write buffer program and burst word program, the program time is same.
- Yes, your understanding is correct. Programming full-512 byte at a time is most efficient. In other words, if you program only one word by write buffer program, it takes 270us in typical.
Regards.
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Hi,
Thanks very much for your response, these information is very much for us.
Now, I have another question about < write buffer program> of s26ks hyperflash. I want to write multiple word using sequence like this "555->AA->2AA->55->SA->25->SA->WC->WBL->DATA->DATA->DATA", which use single "WBL" followed by multiple words data. Maybe this is different with datasheet as picture below.
My experiment results are those:
1) In RTL simulaton using s26ks hyperflash Verilog model, my write buffer program command( "555->AA->2AA->55->SA->25->SA->WC->WBL->DATA->DATA->DATA") succeed.
2)When i run same code in real s26ks flash memory, it failed.
So, i want to ask if s26ks can support write buffer program like "555->AA->2AA->55->SA->25->SA->WC->WBL->DATA->DATA->DATA" or not?
Thanks a lot.
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Can your give me some advice for write buffer program command using sequece like "555->AA->2AA->55->SA->25->SA->WC->WBL->DATA->DATA->DATA"?
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