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AM45DL3208G 데이터시트(PDF) 29 Page - Advanced Micro Devices |
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AM45DL3208G 데이터시트(HTML) 29 Page - Advanced Micro Devices |
29 / 66 page March 12, 2004 Am45DL3208G 27 PR EL I M I N ARY FLASH COMMAND DEFINITIONS Writing specific address and data commands or se- quences into the command register initiates device op- erations. Tables 15 and 16 define the valid register command sequences. Writing incorrect address and data values or writing them in the improper sequence may place the device in an unknown state. A reset command is then required to return the device to read- ing array data. All addresses are latched on the falling edge of WE# or CE#f, whichever happens later. All data is latched on the rising edge of WE# or CE#f, whichever hap- pens first. Refer to the AC Characteristics section for timing diagrams. Reading Array Data The device is automatically set to reading array data after device power-up. No commands are required to retrieve data. Each bank is ready to read array data after completing an Embedded Program or Embedded Erase algorithm. After the device accepts an Erase Suspend command, the c orres ponding bank enter s the erase-s us- pend-read mode, after which the system can read data from any non-erase-suspended sector within the same bank. The system can read array data using the standard read timing, except that if it reads at an ad- dress within erase-suspended sectors, the device out- puts status data. After completing a programming operation in the Erase Suspend mode, the system may once again read array data with the same excep- tion. See the Erase Suspend/Erase Resume Com- mands section for more information. The system must issue the reset command to return a bank to the read (or erase-suspend-read) mode if DQ5 goes high during an active program or erase opera- tion, or if the bank is in the autoselect mode. See the next section, Reset Command, for more information. See also Requirements for Reading Array Data in the section for more information. The Read-Only Opera- tions table provides the read parameters, and Figure 15 shows the timing diagram. Reset Command Writing the reset command resets the banks 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 bank to which the sys- tem was writing to the read mode. Once erasure be- gins, however, the device ignores 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 bank to which the system was writing to the read mode. If the program command sequence is written to a bank that is in the Erase Suspend mode, writing the reset c omm an d re tu r ns tha t ba nk to t he e ras e - s us - pend-read mode. Once programming begins, 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 a bank entered the autoselect mode while in the Erase Sus- pend mode, writing the reset command returns that bank to the erase-suspend-read mode. If DQ5 goes high during a program or erase operation, writing the reset command returns the banks to the read mode (or erase-suspend-read mode if that bank 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. The autoselect command sequence may be written to an address within a bank that is either in the read or erase-suspend-read mode. The autoselect command may not be written while the device is actively pro- gramming or erasing in the other bank. The autoselect command sequence is initiated by first writing two unlock cycles. This is followed by a third write cycle that contains the bank address and the au- toselect command. The bank then enters the autose- lect mode. The system may read any number of autoselect codes without reinitiating the command se- quence. Tables 15 and 16 show the address and data require- ments. To determine sector protection information, the system must write to the appropriate bank address (BA) and sector address (SADD). Tables 5 and 7 show the address range and bank number associated with each sector. The system must write the reset command to return to the read mode (or erase-suspend-read mode if the bank was previously in Erase Suspend). Enter SecSi™ Sector/Exit SecSi Sector Command Sequence The SecSi Sector region provides a secured data area containing a random, sixteen-byte electronic serial number (ESN). The system can access the SecSi |
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