Electronic Components Datasheet Search |
|
NM29A040V Datasheet(PDF) 7 Page - National Semiconductor (TI) |
|
|
NM29A040V Datasheet(HTML) 7 Page - National Semiconductor (TI) |
7 / 14 page Instruction Set (Continued) ERASE The Erase command erases a single block The Erase com- mand is followed by a single byte telling which block to erase In this manner no Set-Address sequence is required to erase a block Following the block address byte is a sin- gle byte security code 55H that is used to prevent inadver- tent erasure Get-Status may be used to check if the opera- tion was completed successfully At the completion of the Erase command the selected address is undetermined A Set-Address command is required before any subsequent Read or Write DATA-SHIFT-IN The Data-Shift-In command is used to send data into the on-chip buffer The number of bits sent into the buffer is determined by an 8-bit argument following the command The argument is always 1 less than the actual number of bits to shift in For example to shift in all 32 bytes (256 bits) the argument would be FFH (255) To shift in just 4 bytes (32 bits) the argument would be 1FH (31) Following the argument the data is shifted in through DI Data-Shift-In may come before or after the Set-Address sequence when performing a page write operation DATA-SHIFT-OUT The Data-Shift-Out command is used to shift data out of the on-chip buffer through DO The number of bits sent out is determined by an 8-bit argument following the command The argument is always 1 less than the actual number of bits to shift out For example to shift out all 32 bytes (256 bits) the argument would be FFH (255) To shift out 2 bytes (16 bits) the argument would be 0FH (15) Following the argument the data is shifted out through DO Data shifted out during this command is also internally shifted back into the data register Thus after shifting all 256 bits the con- tents of the data register remain unchanged WRITE ENABLE The Write Enable command is used as a security check against inadvertent writes or erases to the device When this command is issued any subsequent Write or Erase commands proceed in the normal fashion If the Write En- able command is not given or the device is in the Write Disable mode then a write to any page or erase to any block will not be allowed Use the Get-Status command to deter- mine whether the device currently is in the Write Enabled or Disabled mode The NM29A040080 will always power up in the Write Disable mode This command may be issued while the device is busy Any change in the Write Enable status will affect the next write or erase operation that is issued WRITE DISABLE The Write Disable command is used to prevent inadvertant writes or erases Once this command is executed all subse- quent Write or Erase commands will not be accepted This command may be issued while the device is busy Any change in the Write Enable status will affect the next write or erase operation that is issued READ LAST BLOCK The Read Last Block command is used to read the contents of Block 127 (4-Mbit) or Block 254 (8-Mbit) The Read Last Block operation proceeds like a normal read operation ex- cept that the block number is ignored in the Set-Address sequence The block address is automatically set to Block 127 or 254 The Set-Address command is still necessary to set the page to be read In the case of the 8M the page address can range from 0 – 255 for purposes of reading or writing the last block WRITE LAST BLOCK The Write Last Block command writes a page of data to the currently selected page of Block 127 or 254 The Write Last Block command operates like a normal write command ex- cept the block number is ignored in the Set-Address se- quence The block address is automatically set to Block 127 or 254 The Set-Address command is still necessary to set the page to be written In the case of the 8M the page address can range from 0 – 255 for purposes of reading or writing the last block The Write Last Block command is followed by a security code (55H) Once the information has been written into the memory array it may not be erased http www nationalcom 7 |
Similar Part No. - NM29A040V |
|
Similar Description - NM29A040V |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |