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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AM29LV652D 데이터시트(PDF) 28 Page - Advanced Micro Devices |
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AM29LV652D 데이터시트(HTML) 28 Page - Advanced Micro Devices |
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28 / 54 page  26 Am29LV652D 24961A5 May 5, 2006 D A TA SH EE T the next section, “Reset Command”, for more informa- tion. See also “VersatileIO‰ (VIO) Control” on page 9 for more information. The Read-Only Operations table provides the read parameters, and Figure 13, on page 39 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). Autoselect Command Sequence The autoselect command sequence allows the host system to access the manufacturer and device codes, and determine whether or not a sector is protected. Table 10, on page 30 shows the address and data re- quirements. This method is an alternative to that shown in Table 4, on page 19, which is intended for PROM programmers and requires V ID on address A9. The autoselect command sequence may be written to an a ddr ess tha t is eith er in t h e re ad or erase-suspend-read mode. The autoselect command may not be written while the device is actively pro- gramming 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: ■ A read cycle at address XX00h returns the manu- facturer code. ■ A read cycle at address XX01h returns the device code. ■ A read cycle to an address containing a sector group address (SA), and the address 02h on A7–A0 returns 01h if the sector group is protected, or 00h if it is unprotected. (Refer to Table 5, on page 20 for valid sector addresses). 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). Byte 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 controls or timings. The device automatically provides internally generated program pulses and verifies the programmed cell margin. Table 10, on page 30 shows the address and data requirements for the byte pro- gram command sequence. When the Embedded Program algorithm is complete, the device then returns to the read mode and ad- dresses are no longer latched. The system can deter- mine the status of the program operation by using DQ7, DQ6, or RY/BY#. Refer to the “Write Operation Status” on page 31 section for information on these status bits. Any commands written to the device during the Em- bedded Program Algorithm are ignored. Note that a hardware reset immediately terminates the program operation. The program command sequence should be reinitiated once the device returns to the read mode, to ensure data integrity. Programming is allowed in any sequence and across sector boundaries. A bit cannot be programmed from “0” back to a “1.” Attempting to do so may cause the device to set DQ5 = 1, or cause the DQ7 and DQ6 status bits to indicate the operation was suc- cessful. However, a succeeding read shows that the data is still “0.” Only erase operations can convert a “0” to a “1.” Unlock Bypass Command Sequence The unlock bypass feature allows the system to pro- gram bytes to the device faster than using the stan- dard program command sequence. The unlock bypass command sequence is initiated by first writing two un- |
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