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EN29PL064-70TI Datasheet(PDF) 42 Page - Eon Silicon Solution Inc. |
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EN29PL064-70TI Datasheet(HTML) 42 Page - Eon Silicon Solution Inc. |
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42 / 66 page  This Data Sheet may be revised by subsequent versions ©2004 Eon Silicon Solution, Inc., www.essi.com.tw or modifications due to changes in technical specifications. 42 EN29PL064/032 Rev. D, Issue Date: 2008/03/27 9. Command sequence returns FFh if PPMLB is set. 10. The password is written over four consecutive cycles, at addresses 0-3. 11. A 2 µs timeout is required between any two portions of password. 12. A 100 µs timeout is required between cycles 4 and 5. 13. A 1.2 ms timeout is required between cycles 4 and 5. 14. Cycle 4 erases all PPBs. Cycles 5 and 6 validate bits have been fully erased when DQ0 = 0. If DQ0 = 1 in cycle 6, erase command must be issued and verified again. Before issuing erase command, all PPBs should be programmed to prevent PPB overerasure. 15. DQ1 = 1 if PPB locked, 0 if unlocked. 16. Once the Secured Silicon Sector Entry Command sequence has been entered, the standard array cannot be accessed until the Exit SecSi Sector command has been entered or the device has been reset. 16. Write Operation Status The device provides several bits to determine the status of a program or erase operation: DQ2, DQ3, DQ5, DQ6, and DQ7. Table 16.1 and the following subsections describe the function of these bits. DQ7 and DQ6 each offer a method for determining whether a program or erase operation is complete or in progress. The device also provides a hardware-based output signal, RY/BY#, to determine whether an Embedded Program or Erase operation is in progress or has been completed. 16.1 DQ7: Data# Polling The Data# Polling bit, DQ7, indicates to the host system whether an Embedded Program or Erase algorithm is in progress or completed, or whether a bank is in Erase Suspend. Data# Polling is valid after the rising edge of the final WE# pulse in the command sequence. During the Embedded Program algorithm, the device outputs on DQ7 the complement of the datum programmed to DQ7. This DQ7 status also applies to programming during Erase Suspend. When the Embedded Program algorithm is complete, the device outputs the datum programmed to DQ7. The system must provide the program address to read valid status information on DQ7. If a program address falls within a protected sector, Data# Polling on DQ7 is active for approximately 1 µs, then that bank returns to the read mode. During the Embedded Erase algorithm, Data# Polling produces a “0” on DQ7. When the Embedded Erase algorithm is complete, or if the bank enters the Erase Suspend mode, Data# Polling produces a “1” on DQ7. The system must provide an address within any of the sectors selected for erasure to read valid status information on DQ7. After an erase command sequence is written, if all sectors selected for erasing are protected, Data# Polling on DQ7 is active for approximately 400 µs, then the bank returns to the read mode. If not all selected sectors are protected, the Embedded Erase algorithm erases the unprotected sectors, and ignores the selected sectors that are protected. However, if the system reads DQ7 at an address within a protected sector, the status may not be valid. When the system detects DQ7 has changed from the complement to true data, it can read valid data at DQ15–DQ0 on the following read cycles. Just prior to the completion of an Embedded Program or Erase operation, DQ7 may change asynchronously with DQ15–DQ0 while Output Enable (OE#) is asserted low. That is, the device may change from providing status information to valid data on DQ7. Depending on when the system samples the DQ7 output, it may read the status or valid data. Even if the device has completed the program or erase operation and DQ7 has valid data, the data outputs on DQ15–DQ0 may be still invalid. Valid data on DQ15–DQ0 will appear on successive read cycles. Table 16.1 shows the outputs for Data# Polling on DQ7. Figure 16.1 shows the Data# Polling algorithm. Figure 20.10 shows the Data# Polling timing diagram. |
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