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AM29LV652DU90RMAI 데이터시트(PDF) 34 Page - SPANSION |
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34 / 55 page 32 Am29LV652D October 29, 2004 PRELI M INARY RY/BY#: Ready/Busy# The RY/BY# is a dedicated, open-drain output which indicates whether an Embedded Algorithm 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, sev- eral RY/BY#s can be tied together in parallel with a pull-up resistor to VCC. If the output is low (Busy), the device is actively eras- ing or programming. (This includes programming in the Erase Suspend mode.) If the output is high (Ready), the device is in the read mode, the standby mode, or the device is in the erase-suspend-read mode. Table 11, on page 34 shows the outputs for RY/BY#. DQ6: Toggle Bit I Toggle Bit I on DQ6 indicates whether an Embedded Program or Erase algorithm is in progress or com- plete, or whether the device has entered the Erase Suspend mode. Toggle Bit I may be read at any ad- dress, and is valid after the rising edge of the final WE# pulse in the command sequence (prior to the program or erase operation), and during the sector erase time-out. During an Embedded Program or Erase algorithm op- eration, successive read cycles to any address cause DQ6 to toggle. The system may use either OE# or CE# (or CE2#) to control the read cycles. When the operation is complete, DQ6 stops toggling. After an erase command sequence is written, if all sectors selected for erasing are protected, DQ6 toggles for approxi- mately 100 µs, then returns to reading array data. If not all selected sectors are protected, the Embedded Erase algo- rithm erases the unprotected sectors, and ignores the se- lected sectors that are protected. The system can use DQ6 and DQ2 together to determine whether a sector is actively erasing or is erase-suspended. When the device is actively erasing (that is, the Embedded Erase algorithm is in progress), DQ6 toggles. When the de- vice enters the Erase Suspend mode, DQ6 stops toggling. However, the system must also use DQ2 to determine which sectors are erasing or erase-suspended. Alterna- tively, the system can use DQ7 (see the subsection on “DQ7: Data# Polling” on page 31). If a program address falls within a protected sector, DQ6 toggles for approximately 1 µs after the program command sequence is written, then returns to reading array data. DQ6 also toggles during the erase-suspend-program mode, and stops toggling once the Embedded Pro- gram algorithm is complete. Table 11, on page 34 shows the outputs for Toggle Bit I on DQ6. Figure 6 shows the toggle bit algorithm. Fig- ure 19, on page 45 in the “AC Characteristics” section shows the toggle bit timing diagrams. Figure 20, on page 45 shows the differences between DQ2 and DQ6 in graphical form. See also the subsection “DQ2: Tog- gle Bit II” on page 33. Figure 6. Toggle Bit Algorithm START No Yes Yes DQ5 = 1? No Yes Toggle Bit = Toggle? No Program/Erase Operation Not Complete, Write Reset Command Program/Erase Operation Complete Read DQ7–DQ0 Toggle Bit = Toggle? Read DQ7–DQ0 Twice Read DQ7–DQ0 Note: The system should recheck the toggle bit even if DQ5 = “1” because the toggle bit may stop toggling as DQ5 changes to “1.” See the subsections on DQ6 and DQ2 for more information. |
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