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AM29DS323B120WMIN Datasheet(PDF) 29 Page - SPANSION |
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AM29DS323B120WMIN Datasheet(HTML) 29 Page - SPANSION |
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29 / 52 page  28 Am29DS32xG May 15, 2002 ADV ANC E INFO RMAT ION 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 15 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 hard- ware-based output signal, RY/BY#, to determine whether an Embedded Program or Erase operation is in progress or has been completed. 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 Sus- pend. Data# Polling is valid after the rising edge of the final WE# pulse in the command sequence. During the Embedded Program algorithm, the device out- puts 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 ac- tive 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 infor- mation on DQ7. After an erase command sequence is written, if all sectors selected for erasing are protected, Data# Poll- ing on DQ7 is active for approximately 100 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 se- lected sectors that are protected. However, if the sys- tem reads DQ7 at an address within a protected sector, the status may not be valid. Just prior to the completion of an Embedded Program or Erase operation, DQ7 may change asynchronously with DQ0–DQ6 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 com- pleted the program or erase operation and DQ7 has valid data, the data outputs on DQ0–DQ6 may be still invalid. Valid data on DQ7–DQ0 will appear on suc- cessive read cycles. Table 15 shows the outputs for Data# Polling on DQ7. Figure 5 shows the Data# Polling algorithm. Figure 21 in the AC Characteristics section shows the Data# Polling timing diagram. Figure 5. Data# Polling Algorithm DQ7 = Data? Yes No No DQ5 = 1? No Yes Yes FAIL PASS Read DQ7–DQ0 Addr = VA Read DQ7–DQ0 Addr = VA DQ7 = Data? START Notes: 1. VA = Valid address for programming. During a sector erase operation, a valid address is any sector address within the sector being erased. During chip erase, a valid address is any non-protected sector address. 2. DQ7 should be rechecked even if DQ5 = “1” because DQ7 may change simultaneously with DQ5. |
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