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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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S29GL01GP Fiches technique(PDF) 28 Page - Cypress Semiconductor |
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S29GL01GP Fiches technique(HTML) 28 Page - Cypress Semiconductor |
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28 / 82 page  Document Number: 002-00886 Rev. *B Page 28 of 83 S29GL01GP S29GL512P S29GL256P S29GL128P 7.7.5 Erase Suspend/Erase Resume Commands The Erase Suspend command allows the system to interrupt a sector erase operation and then read data from, or program data to, any sector not selected for erasure. The sector addresses are “don't-cares” when writing this command. This command is valid only during the sector erase operation, including the tSEA time-out period during the sector erase command sequence. The Erase Suspend command is ignored if written during the chip erase operation. When the Erase Suspend command is written during the sector erase operation, the device requires a maximum of 20 µs (5µs typical) to suspend the erase operation. However, when the Erase Suspend command is written during the sector erase time-out, the device immediately terminates the time-out period and suspends the erase operation. After the erase operation has been suspended, the device enters the erase-suspend-read mode. The system can read data from or program data to any sector not selected for erasure. (The device “erase suspends” all sectors selected for erasure.) Reading at any address within erase-suspended sectors produces status information on DQ7-DQ0. The system can use DQ7, or DQ6, and DQ2 together, to determine if a sector is actively erasing or is erase-suspended. Refer to Table 7.35 for information on these status bits. After an erase-suspended program operation is complete, the device returns to the erase-suspend-read mode. The system can determine the status of the program operation using write operation status bits, just as in the standard program operation. In the erase-suspend-read mode, the system can also issue the Autoselect command sequence. Refer to Write Buffer Programming on page 23 and the Autoselect on page 17 for details. To resume the sector erase operation, the system must write the Erase Resume command. The address of the erase-suspended sector is a “don't-care” when writing this command. Further writes of the Resume command are ignored. Another Erase Suspend command can be written after the chip has resumed erasing. Software Functions and Sample Code The following is a C source code example of using the erase suspend function. Refer to the Cypress Low Level Driver User’s Guide (available on www.cypress.com) for general information on Cypress Flash memory software development guidelines. /* Example: Erase suspend command */ *( (UINT16 *)base_addr ) = 0x00B0; /* write suspend command */ The following is a C source code example of using the erase resume function. Refer to the Cypress Low Level Driver User’s Guide (available on www.cypress.com) for general information on Cypress Flash memory software development guidelines. /* Example: Erase resume command */ *( (UINT16 *)sector_addr ) = 0x0030; /* write resume command */ /* The flash needs adequate time in the resume state */ Erase Suspend (LLD Function = lld_EraseSuspendCmd) Cycle Operation Byte Address Word Address Data 1 Write Base + XXXh Base + XXXh 00B0h Erase Resume (LLD Function = lld_EraseResumeCmd) Cycle Operation Byte Address Word Address Data 1 Write Sector Address Sector Address 0030h |
Numéro de pièce similaire - S29GL01GP |
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Description similaire - S29GL01GP |
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