Electronic Components Datasheet Search |
|
M29W040-200K5R Datasheet(PDF) 8 Page - STMicroelectronics |
|
M29W040-200K5R Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 31 page Instructions and Commands The Command Interface (C.I.) latches commands written to the memory. Instructions are made up from one or more commands to perform Read Array/Reset, Read Electronic Signature, Power Down, Block Erase, Chip Erase, Program, Block Erase Suspend and Erase Resume. Commands are made of address and data sequences. Ad- dresses are latched on the falling edge of W or E and data is latched on the rising of W or E. The instructions require from 1 to 6 cycles, the first or first three of which are always write operations used to initiate the command. They are followed by either further write cycles to confirm the first com- mand or execute the command immediately. Com- mand sequencing must be followed exactly. Any invalid combination of commands will reset the device to Read Array. The increased number of cycles has been chosen to assure maximum data security. Commands are initialised by two preced- ing coded cycles which unlock the Command Inter- face. In addition, for Erase, command confirmation is again preceeded by the two coded cycles. P/E.C. status is indicated during command execu- tion by Data Polling on DQ7, detectionof Toggle on DQ Name Logic Level Definition Note 7 Data Polling ’1’ Erase Complete Indicates the P/E.C. status, check during Program or Erase, and on completion before checking bits DQ5 for Program or Erase Success. ’0’ Erase on going DQ Program Complete DQ Program on going 6 Toggle Bit ’-1-0-1-0-1-0-1-’ Erase or Program on going Successive read output complementary data on DQ6 while Programming or Erase operations are going on. DQ6 remain at constant level when P/E.C. operations are completed or Erase Suspend is acknowledged. ’-0-0-0-0-0-0-0-’ Program (’0’ on DQ6) Complete ’-1-1-1-1-1-1-1-’ Erase or Program (’1’ on DQ6) Complete 5 Error Bit ’1’ Program or Erase Error This bit is set to ’1’ if P/E.C. has exceded the specified time limits. ’0’ Program or Erase on going 4 ’1’ ’0’ 3 Erase Time Bit ’1’ Erase Timeout Period Expired P/E.C. Erase operation has started. Only possible command entry is Erase Suspend (ES). An additional block to be erased in parallel can be entered to the P/E.C. ’0’ Erase Timeout Period on going 2 Reserved 1 Reserved 0 Reserved Note: Logic level ’1’ is High, ’0’ is Low. -0-1-0-0-0-1-1-1-0- represent bit value in successive Read operations. Table 8. Status Register DQ6, or Error on DQ5 and Erase Timer DQ3 bits. Any read attempt during Program or Erase com- mand executionwill automaticallyoutput those four bits. The P/E.C. automatically sets bits DQ3, DQ5, DQ6 and DQ7. Other bits (DQ0, DQ1, DQ2 and DQ4) are reserved for future use and should be masked. Data Polling bit (DQ7). When Programming op- erations are in progress, this bit outputs the com- plement of the bit being programmed on DQ7. During Erase operation, it outputs a ’0’. After com- pletion of the operation, DQ7 will output the bit last programmed or a ’1’ after erasing. Data Polling is valid only effective during P/E.C. operation, that is after the fourth W pulse for programming or after the sixth W pulse for Erase. It must be performed at the address being programmed or at an address within the block being erased. If the byte to be programmed belongs to a protectedblock the com- mand is ignored. If all the blocks selected for era- sure are protected, DQ7 will set to ’0’ for about 100 µs, and then return to previous addressed memory data. See Figure 9 for the Data Polling flowchart and Figure 10 for the Data Polling wave- forms. 8/31 M29W040 |
Similar Part No. - M29W040-200K5R |
|
Similar Description - M29W040-200K5R |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | 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 |