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AM29LV800DB-120ED Datasheet(PDF) 25 Page - Advanced Micro Devices |
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AM29LV800DB-120ED Datasheet(HTML) 25 Page - Advanced Micro Devices |
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25 / 51 page  January 21, 2005 Am29LV800D_00_A4_E Am29LV800D 23 P R E L I M I NARY prior to this, the device outputs the “comple- ment,” or “0.” 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 approxi- mately 100 µs, then the device returns to reading array data. If not all selected sectors are protected, the Embedded Erase algorithm erases the unprotected sectors, and ignores the selected sectors that are protected. When the system detects DQ7 has changed from the complement to true data, it can read valid data at DQ7–DQ0 on the following read cycles. This is because DQ7 may change asyn- chronously with DQ0–DQ6 while Output Enable (OE#) is asserted low. Figure 1, Data# Polling Timings (During Embedded Algorithms), in the “AC Characteristics” section illustrates this. Table 6 shows the outputs for Data# Polling on DQ7. Figure 1 shows the Data# Polling algo- rithm. RY/BY#: Ready/Busy# The RY/BY# is a dedicated, open-drain output pin that indicates whether an Embedded Algo- rithm is in progress or complete. The RY/BY# status is valid after the rising edge of the final WE# pulse in the command sequence. Since RY/BY# is an open-drain output, several 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 an address within any sector selected for erasure. During chip erase, a valid address is any non-protected sector address. 2. DQ7 should be rechecked even if DQ5 = “1” be- cause DQ7 may change simultaneously with DQ5. Figure 1. Data# Polling Algorithm |
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