Non-volatile memory device with improved sequential programming speed
View Patent ↗A non-volatile memory device suitable to be programmed in a sequential mode. The device includes a plurality of blocks of memory cells each one for storing a word, each block being identified by an address. An input circuit for loading an input address at the beginning of a programming procedure and an internal circuit for setting an internal address to the input address. The device further includes a data input circuit for loading a predetermined number of input words in succession, and a latch circuit for latching a page consisting of the predetermined number of input words. The memory then executes a programming operation including writing the page in the blocks identified by consecutive addresses starting from the internal address, and increments the internal address of the predetermined number in response to the completion of the programming operation.
1. A non-volatile memory device suitable to be programmed in a sequential mode comprising:
a plurality of blocks of memory cells each one for storing a word, each block being identified by an address;
means for loading an input address at the beginning of a programming procedure;
means for setting an internal address to the input address;
means for loading a predetermined number of input words in succession;
means for latching a page consisting of the predetermined number of input words
means for executing a programming operation including writing the page in the blocks identified by consecutive addresses starting from the internal address; and
means for incrementing the internal address of the predetermined number in response to the completion of the programming operation.
2. The device according to claim 1 further including:
a state register coupled to programming operation means for outputting an indication of the state of the programming operation.
3. The device according to claim 1 wherein the memory cells are partitioned into a plurality of sectors, the writing operation being executed on a current sector, and wherein the device further includes means for loading a new input address in response to the completion of the writing operation.
4. The device according to claim 3 , further including means for terminating the programming procedure when the internal address reaches an end of the current sector.
5. The device according to claim 3 , further including means for terminating the programming procedure if the new input address does not identify the current sector and the input word is equal to a predetermined value.
6. The device according to claim 3 , further including means for storing a starting address equal to the input address and means for setting the internal address to the new input address if the new input address identifies the current sector and is different from the starting address.
7. The device according to claim 3 , further including means for discarding the input word if the new input address does not identify the current sector.
8. The device according to claim 3 , further including means for asserting a flag for a busy state of the device in response to the loading of the predetermined number of words and for de-asserting the flag in response to the completion of the programming operation.
9. A method of programming a non-volatile memory device in a sequential mode including a plurality of blocks of memory cells each one for storing a word, each block being identified by an address, the method including the steps of:
loading an input address at the beginning of a programming procedure, and
setting an internal address to the input address,
characterized by
repeating a plurality of times the steps of:
loading a predetermined number of input words in succession,
latching a page consisting of the predetermined number of input words,
executing a programming operation including writing the page in the blocks identified by consecutive addresses starting from the internal address, and
incrementing the internal address of the predetermined number in response to the completion of the programming operation.
10. The method according to claim 9 wherein the step of executing ( 210 d ) a programming operation further includes:
verifying the written page, and
at least partially re-writing the page in response to a negative result of the verification.
11. The method according to claim 9 wherein the memory cells are partitioned into a plurality of sectors, the writing operation being executed on a current sector, and wherein the method further includes the step of:
loading a new input address in response to the completion of the writing operation.
12. The method according to claim 11 , further including the step of:
terminating the programming procedure when the internal address reaches an end of the current sector.
13. The method according to claim 11 , further including the step of:
terminating the programming procedure if the new input address does not identify the current sector and the input word is equal to a predetermined value.
14. The method according to claim 11 , further including the steps of:
storing a starting address equal to the input address, and
setting the internal address to the new input address if the new input address identifies the current sector and is different from the starting address.
15. The method according to claim 11 , further including the step of:
discarding the input word if the new input address does not identify the current sector.
16. The method according to claim 11 , further including the steps of:
asserting a flag for a busy state of the device in response to the loading of the predetermined number of words, and
de-asserting the flag in response to the completion of the programming operation.
17. A programming device for controlling the programming in a sequential mode of a non-volatile memory device including means for providing an input address at the beginning of a programming procedure, means for providing a predetermined number of input words in succession without increasing the input address, and means for waiting for the completion of a programming operation of a page consisting of the predetermined number of input words.
18. A method of controlling the programming in a sequential mode of a non-volatile memory device including the steps of:
providing an input address at the beginning of a programming procedure,
and repeating a plurality of times the steps of:
providing a predetermined number of input words in succession without increasing the input address, and
waiting for the completion of a programming operation of a page consisting of the predetermined number of input words.