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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AM42BDS6408HD4I 데이터시트(PDF) 45 Page - SPANSION |
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AM42BDS6408HD4I 데이터시트(HTML) 45 Page - SPANSION |
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45 / 90 page  October 23, 2003 Am42BDS6408H 43 A D VA NCE I N FO RM ATIO N 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 18, “Write Operation Status,” on page 47 and the following subsections describe the function of these bits. DQ7 and DQ6 each offers a method for determining whether a program or erase operation is complete or in progress. DQ7: Data# Polling The Data# Polling bit, DQ7, indicates to the host system whether an Embedded Program or Erase algo- rithm 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 pro- grammed to DQ7. This DQ7 status also applies to pro- g r a mmi ng du r i ng E r a s e S u s pen d. Wh en 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 infor- mation 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 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 selected sectors that are protected. However, if the system 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 DQ6–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 com- pleted the program or erase operation and DQ7 has valid data, the data outputs on DQ6-DQ0 may be still invalid. Valid data on DQ7-DQ0 will appear on succes- sive read cycles. Table 18, “Write Operation Status,” on page 47 shows the outputs for Data# Polling on DQ7. Figure 6, “Data# Polling Algorithm,” on page 43 shows the Data# Polling al g or i t h m. F i gure 37, “Data# Po ll i ng Timi ngs (During Embedded Algorithm),” on page 72 in the AC Characteristics section shows the Data# Polling timing diagram. 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. Figure 6. 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 |
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