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AM29PDS322DT120WMI 데이터시트(PDF) 24 Page - Advanced Micro Devices |
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AM29PDS322DT120WMI 데이터시트(HTML) 24 Page - Advanced Micro Devices |
24 / 51 page 22 Am29PDS322D 23569A5 December 4, 2006 D A TA SH EE T and the system may read any number of autoselect codes without reinitiating the command sequence. Table 10 shows the address and data requirements for the command sequence. To determine sector protec- tion information, the system must write to the appropri- ate sector group address (SGA). Tables 3 and 5 show the address range associated with each sector. 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 16-byte 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 Mem- ory Region” for further information. Note that a hard- ware reset (RESET#=V IL) will reset the device to reading array data. 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 controls or timings. The device automatically provides internally generated program pulses and verifies the programmed cell margin. Table 10 shows the address and data requirements for the program command se- quence. 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 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 has returned 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 will show 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 words to the device faster than using the stan- dard program command sequence. The unlock bypass command sequence is initiated by first writing two un- lock cycles. This is followed by a third write cycle con- taining the unlock bypass command, 20h. The device then enters the unlock bypass mode. A two-cycle un- lock bypass program command sequence is all that is required to program in this mode. The first cycle in this sequence contains the unlock bypass program com- mand, A0h; the second cycle contains the program address and data. Additional data is programmed in the same manner. This mode dispenses with the initial two unlock cycles required in the standard program command sequence, resulting in faster total program- ming time. Table 10 shows the requirements for the command sequence. During the unlock bypass mode, only the Unlock By- pass Program and Unlock Bypass Reset commands are valid. To exit the unlock bypass mode, the system must issue the two-cycle unlock bypass reset com- mand sequence. The first cycle must contain the data 90h. The second cycle must contain the data 00h. The device then returns to reading array data. See Figure 4 for the unlock bypass algorithm. The device offers accelerated program operations through the WP#/ACC pin. When the system asserts V HH on the WP#/ACC pin, the device automatically en- ters the Unlock Bypass mode. The system may then write the two-cycle Unlock Bypass program command sequence. The device uses the higher voltage on the WP#/ACC pin to accelerate the operation. Note that the WP#/ACC pin must not be at V HH any operation other than accelerated programming, or device dam- age may result. In addition, the WP#/ACC pin must not be left floating or unconnected; inconsistent behavior of the device may result. Figure 5 illustrates the algorithm for the program oper- ation. Refer to the Erase and Program Operations table in the AC Characteristics section for parameters, and Figure 18 for timing diagrams. Chip Erase Command Sequence Chip erase is a six bus cycle operation. The chip erase command sequence is initiated by writing two unlock |
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