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ES29LV800D Datasheet(PDF) 22 Page - Excel Semiconductor Inc. |
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ES29LV800D Datasheet(HTML) 22 Page - Excel Semiconductor Inc. |
22 / 50 page ES I ES I 22 Rev. 1D January 5, 2006 ES29LV800D Excel Semiconductor inc. In the ES29LV800 device, several bits are provided to determine the status of a program or erase oper- ation: DQ2, DQ3, DQ5, DQ6, DQ7 and RY/BY#. Table 6 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 com- pleted. 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 device is in Erase Suspend. Data# Polling is valid after the rising edge of the final WE# pulse in the command sequence. During Programming 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 com- plete, 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 250ns, then the device returns to the read mode. During Erase During the Embedded Erase algorithm, Data# Poll- ing produces a “0” on DQ7. When the Embedded Erase algorithm is complete, or if the device 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. Erase on the Protected Sectors After an erase command sequence is written, if all sectors selected for erasing are protected, Data# Polling on DQ7 is active for approximately 1.8us, then the device 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. How- ever, if the system reads DQ7 at an address within a protected sector, the status may not be valid. Data# Polling Algorithm Just prior to the completion of an Embedded Program or Ease operation, DQ7 may change asynchronously with DQ0-DQ6 while Output Enable(OE#) is asserted low. That is, this 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 DQ0-DQ7 will appear on successive read cycles. Table 6 shows the outputs for Data# Polling on DQ7. Fig. 9 shows the Data# Polling algorithm. Fig. 22 in the AC Characteristics section shows the Data# Polling timing diagram. WRITE OPERATION STATUS |
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