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AM29LV641ML110EI 데이터시트(PDF) 25 Page - Advanced Micro Devices |
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AM29LV641ML110EI 데이터시트(HTML) 25 Page - Advanced Micro Devices |
25 / 60 page December 21, 2005 Am29LV641MH/L 23 DA TA SH EET non-erase-suspended sector. After completing a pro- gramming operation in the Erase Suspend mode, the system may once again read array data with the same exception. See the Erase Suspend/Erase Resume Commands section for more information. The system must issue the reset command to return the device to the read (or erase-suspend-read) mode if DQ5 goes high during an active program or erase op- eration, or if the device is in the autoselect mode. See the next section, Reset Command, for more informa- tion. See also Requirements for Reading Array Data in the Device Bus Operations section for more information. The Read-Only Operations table provides the read pa- rameters, and Figure 14 shows the timing diagram. Reset Command Writing the reset command resets the device to the read or erase-suspend-read mode. Address bits are don’t cares for this command. The reset command may be written between the se- quence cycles in an erase command sequence before erasing begins. This resets the device to the read mode. Once erasure begins, however, the device ig- nores reset commands until the operation is complete. The reset command may be written between the sequence cycles in a program command sequence before programming begins. This resets the device to the read mode. If the program command sequence is written while the device is in the Erase Suspend mode, writing the reset command returns the device to the erase-suspend-read mode. Once programming be- gins, however, the device ignores reset commands until the operation is complete. The reset command may be written between the se- quence cycles in an autoselect command sequence. Once in the autoselect mode, the reset command must be written to return to the read mode. If the de- vice entered the autoselect mode while in the Erase Suspend mode, writing the reset command returns the device to the erase-suspend-read mode. If DQ5 goes high during a program or erase operation, writing the reset command returns the device to the read mode (or erase-suspend-read mode if the device was in Erase Suspend). Note that if DQ1 goes high during a Write Buffer Pro- gramming operation, the system must write the Write-to-Buffer-Abort Reset command sequence to reset the device for the next operation. Autoselect Command Sequence The autoselect command sequence allows the host system to read several identifier codes at specific ad- dresses: Note: The device ID is read over three cycles. SA = Sector Address Table 10 shows the address and data requirements. This method is an alternative to that shown in Table 3, which is intended for PROM programmers and re- quires V ID on address pin A9. The autoselect com- mand sequence may be written to an address that is either in the read or erase-suspend-read mode. The autoselect command may not be written while the de- vice is actively programming or erasing. The autoselect command sequence is initiated by first writing two unlock cycles. This is followed by a third write cycle that contains the autoselect command. The device then enters the autoselect mode. The system may read at any address any number of times without initiating another autoselect command sequence The system must write the reset command to return to the read mode (or erase-suspend-read mode if the de- vice was previously in Erase Suspend). Enter SecSi Sector/Exit SecSi Sector Command Sequence The SecSi Sector region provides a secured data area containing an 8-word random Electronic Serial Num- ber (ESN). The system can access the SecSi Sector region by issuing the three-cycle Enter SecSi Sector command sequence. The device continues to access the SecSi Sector region until the system issues the four-cycle Exit SecSi Sector command sequence. The Exit SecSi Sector command sequence returns the de- vice to normal operation. Table 10 shows the address and data requirements for both command sequences. See also “SecSi (Secured Silicon) Sector Flash Memory Region” for further information. Note that the ACC function and unlock bypass modes are not avail- able when the SecSi Sector is enabled. Word Program Command Sequence Programming is a four-bus-cycle operation. The pro- gram command sequence is initiated by writing two unlock write cycles, followed by the program set-up command. The program address and data are written next, which in turn initiate the Embedded Program al- gorithm. The system is not required to provide further Identifier Code A7:A0 Manufacturer ID 00h Device ID, Cycle 1 01h Device ID, Cycle 2 0Eh Device ID, Cycle 3 0Fh SecSi Sector Factory Protect 03h Sector Protect Verify (SA)02h |
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