Maximum Monolithic Density Density Number of Stacks N25Q512Axxx. 512Mb 2 256Mb N25Q00AAxxx 1Gb 4 MT25Qxs01Gxxx. 1Gb 2 512Mb MT25Qxs02Gxxx 2Gb 4
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1 Technical te N25Q and MT25Q Serial Flash Stacked Devices Introduction Introduction This technical note describes the features of stacked devices for N25Q and MT25Q. These devices are memory with two or more die in the same package. The following topics are discussed in this technical note: Single die operation Common operations for all devices The table below summarizes the stacked devices that are in production: Table 1: Stack Summary Table Micron Part Number Maximum Monolithic Density Density Number of Stacks N25Q512Axxx 512Mb 2 256Mb N25Q00AAxxx 1Gb 4 MT25Qxs01Gxxx 1Gb 2 512Mb MT25Qxs02Gxxx 2Gb 4 1 Products and specifications discussed herein are for evaluation and reference purposes only and are subject to change by Micron without notice. Products are only warranted by Micron to meet Micron's production data sheet specifications. All information discussed herein is provided on an "as is" basis, without warranties of any kind.
2 Single Die Operations N25Q READ MEMORY Figure 1: N25Q Stacked Device Flow Single Die Operations Single die operations modify the status of a single die. An address must be set in the function of a selected die in the following commands: READ MEMORY (3 or 4 byte address mode. Single, dual, and quad I/O): The READ MEMORY process for all stacked device memory is different for the N25Q and MT25Q. The device flow for the N25Q and the MT25Q are shown in the figures below. PROGRAM/ERASE MEMORY DIE ERASE For READ MEMORY, the device outputs data from the selected address die after the die boundary device starts reading from the beginning of the same address die. Therefore, the command must be given several times and must address the appropriate number of devices in the stack to read all of the memory. The figure below shows how to read all the stacked devices, starting from the first die. Start READ die (N = 1) READ Valid address from die N N = N + 1 N = Nr stack READ all stack 2
3 MT25Q READ MEMORY Figure 2: MT25Q Stacked Device Flow Single Die Operations For READ MEMORY, the addressed byte can be at any location, and the address automatically increments to the next address after each byte of data is shifted out; therefore, the entire memory can be read with a single command. The operation is terminated by driving at any time during data output Start READ die READ ADDRESS READ all stack PROGRAM/ERASE To determine if the PROGRAM/ERASE operations are finished, the following two polling methods are available the first is same for N25Q and MT25Q, the second one is different, in fact for N25Q is necessary a check of flag status register (See Fig.4): Polling on bit 7 of the flag status register (Recommended) Polling on bit 0 of status register The following two flow methods show a generic die stack (the ADDRESS value determines the die taken in polling). For flag status register bit 5 (Erase) and bit 4 (Program) give information about error occured 3
4 Figure 3: N25Q and MT25Q First Flow Method (Recommended) Single Die Operations PROGRAM/ERASE ADDRESS Data input READ FLAG STATUS Continuous Reading FLAG STATUS FLAG STATUS Bit 7 = 1 End PROGRAM/ERASE polling 4
5 Figure 4: N25Q Second Flow Method Single Die Operations START polling PROGRAM/ERASE ADDRESS Data input READ STATUS Continuous Reading STATUS STATUS Bit 0=0 READ FLAG STATUS End PROGRAM/ERASE polling 5
6 Figure 5: MT25Q Second Flow Method Single Die Operations START polling PROGRAM/ERASE ADDRESS Data input READ STATUS Continuous Reading STATUS STATUS Bit 0=0 End PROGRAM/ERASE polling 6
7 Common Operations for All of the Devices DIE ERASE The DIE ERASE (C4h) instruction was introduced to allow a global erase inside the selected die. DIE ERASE command has a sector erase frame with addresses; the significant address bits are those related to die selection: for N25Q512Axxx: A25 for N25Q00AAxxx: A26 and A25 for MT25Qxs01Gxxx: A26 for MT25Qxs02Gxxx: A27 and A26 All of the other address bits are "Don t Care." Common Operations for All of the Devices The following operations modify the status of both devices at the same time: WRITE VOLATILE WRITE NONVOLATILE For commands involving writing nonvolatile registers (WRITE STATUS and WRITE NONVOLATILE CONFIGURATION ), the cyclic polling is used. There is only one method for cyclic polling for N25Q, and two methods for MT25Q (see the following figures). For MT25Q stacked devices, cyclic polling is used also for the CRC operations. 7
8 Figure 6: N25Q and MT25Q Cyclic Polling Common Operations for All of the Devices N = 1 WRITE Data input READ FLAG STATUS N = 1 FLAG STATUS Bit 7 = 1 Cyclic polling N = N + 1 N = Nr stack End register polling 8
9 Conclusion Figure 7: MT25Q Cyclic Polling N = 1 WRITE Data input READ STATUS N = 1 STATUS Bit 0 = 0 Cyclic polling N = N + 1 N = Nr stack End register polling Conclusion Stacked devices are memory devices that have two or more die in the same package. Stacked devices have single die operations that modify the status of a single die. These operations include READ MEMORY, PROGRAM/ERASE, and DIE ERASE. The common operations for all of the devices are WRITE VOLATILE and WRITE NONVO- LATILE. Also, the key differences between the N25Q and the MT25Q devices are using the status register for PROGRAM/ERASE and completing command common polling. Refer to the package data sheet for more information on stacked devices. 9
10 Revision History Revision History Rev. C 05/17 Rev. B 10/16 Rev. A 01/15 Review paragraph: Common Operations for All of the Devices Updated DIE ERASE in Single Die Operations section Initial release 8000 S. Federal Way, P.O. Box 6, Boise, ID , Tel: Sales inquiries: Micron and the Micron logo are trademarks of Micron Technology, Inc. All other trademarks are the property of their respective owners. 10
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