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AM41PDS3224DB40IS Datasheet(PDF) 23 Page - Advanced Micro Devices |
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AM41PDS3224DB40IS Datasheet(HTML) 23 Page - Advanced Micro Devices |
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23 / 59 page  22 Am41PDS3224D May 13, 2002 P R E L IMINARY The system must provide the proper signals to the control pins to prevent unintentional writes when V CC is greater than V LKO. Write Pulse “Glitch” Protection Noise pulses of less than 5 ns (typical) on OE#, CE#f or WE# do not initiate a write cycle. Logical Inhibit Write cycles are inhibited by holding any one of OE# = V IL, CE#f = VIH or WE# = VIH. To initiate a write cycle, CE#f and WE# must be a logical zero while OE# is a logical one. Power-Up Write Inhibit If WE# = CE#f = V IL and OE# = VIH during power up, the device does not accept commands on the rising edge of WE#. The internal state machine is automati- cally reset to reading array data on power-up. FLASH COMMAND DEFINITIONS Writing specific address and data commands or se- quences into the command register initiates device op- erations. Table 10 defines the valid register command sequences. Writing incorrect address and data val- ues or writing them in the improper sequence resets the device to reading array data. All addresses are latched on the falling edge of WE# or CE#, whichever happens later. All data is latched on the rising edge of WE# or CE#, whichever happens 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. The device is ready to read array data after completing an Embedded Program or Embedded Erase algorithm. After the device accepts an Erase Suspend command, the device enters the erase-suspend-read mode, after wh i c h th e s y s t e m c an r e a d da ta fr om any 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 operation, or if the device is in the autoselect mode. See the next section, Reset Command, for more infor- mation. See also Requirements for Reading Array Data in the MCP Device Bus Operations section for more informa- tion. The Read-Only Operations table provides the read parameters, and Figure 15 shows the timing dia- gram. 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 shows the address and data requirements. The autoselect command sequence may be written to an add r e s s tha t i s ei the r i n the r ead o r erase-suspend-read mode. The autoselect command may not be written while the device is actively pro- gramming or erasing. |
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