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M29W160DT Datasheet(PDF) 13 Page - STMicroelectronics |
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M29W160DT Datasheet(HTML) 13 Page - STMicroelectronics |
13 / 29 page ![]() 13/29 M29W160DT, M29W160DB Write operation. During Erase Suspend the reset command is ignored. The Program/Erase Controller will suspend within 15 µs of the Erase Suspend Command being is- sued. Once the Program/Erase Controller has stopped the memory will be set to Read mode and the Erase will be suspended. If the Erase Suspend command is issued during the period when the memory is waiting for an additional block (before the Program/Erase Controller starts) then the Erase is suspended immediately and will start im- mediately when the Erase Resume Command is issued. It will not be possible to select any further blocks for erasure after the Erase Resume. During Erase Suspend it is possible to Read and Program cells in blocks that are not being erased; both Read and Program operations behave as normal on these blocks. Reading from blocks that are being erased will output the Status Register. It is also possible to enter the Auto Select mode: the memory will behave as in the Auto Select mode on all blocks until a Read/Reset command returns the memory to Erase Suspend mode. Erase Resume Command. The Erase Resume command must be used to restart the Program/ Erase Controller from Erase Suspend. An erase can be suspended and resumed more than once. Security Data Command. The Security Data command can be used to read the Security Mem- ory Block. The Security Memory Block is a block of 256 words that is usually undefined. Volume cus- tomers can request that a unique security code is pre-programmed by ST into each part. One Bus Write operation is required to issue the Security Data command. Once the Security Data command is issued Bus Read operations read from the Se- curity Memory Block instead of the memory array, until another command is issued. After issuing the Security Data command from Auto Select mode a Read/Reset command will re- turn to Auto Select mode. An invalid command will return to Read mode. Valid addresses for the Security Memory Block are given in Table 6, Security Memory Block Address- es. Although the address for the Security Data command is Don’t Care, it is necessary to choose an address outside the Security Memory Block for correct operation. Table 6. Security Memory Block Addresses Size (words) Address Range (x8) Address Range (x16) 256 000000h-0001FFh 000000h-0000FFh |
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