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EN29F002B-70TI Datasheet(PDF) 11 Page - List of Unclassifed Manufacturers |
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EN29F002B-70TI Datasheet(HTML) 11 Page - List of Unclassifed Manufacturers |
11 / 32 page 4800 Great America Parkway, Suite 202 Tel: 408-235-8680 Santa Clara, CA 95054 Fax: 408-235-8685 11 EN29F002 / EN29F002N Rev. C, Issue Date: 2001/07/05 The flowchart for the Toggle Bit (DQ6) is shown in Flowchart 6. The Toggle Bit timing diagram is shown in Figure 9. DQ5 Exceeded Timing Limits DQ5 will indicate if the program or erase time has exceeded the specified limits (internal pulse count). Under these conditions DQ5 will produce a “1”. (The Toggle Bit (DQ6) should also be checked at this time to make sure that the DQ5 is not a “1” due to the device having returned to read mode.) This is a failure condition which indicates that the program or erase cycle was not successfully completed. DATA Polling (DQ7), Toggle Bit (DQ6) and Erase Toggle Bit (DQ2) still function under this condition. Setting the CE to VIH will partially power down the device under those conditions. The OE and WE pins will control the output disable functions as described in Table 3. The DQ5 failure condition will also appear if the user tries to program a “1” to a location that was previously programmed to a “0”. In this case, the device goes into Hang or Error mode out and never completes the Embedded Program Algorithm. Hence, the system never reads valid data on DQ7 and DQ6 never stops toggling. Once the device exceeds the timing limits, DQ5 will indicate a “1”. Please note that this is not a device failure condition since the device was used incorrectly. If timing limits are exceeded, reset the device. (See Table 6) DQ3 Sector Erase Command Timeout This device does not support multiple sector erase commands. DQ3 will go high immediately after the first 30h command (the sixth write cycle). Any extra 30h commands will be ignored (or taken as a resume command if erase suspended). DQ2 Erase Toggle Bit II In the sector erase operation, DQ2 will toggle with OE or CE when a read is attempted within the sector that is being erased. DQ2 will not toggle if the read address is not within the sector that is selected to be erased. In the chip erase operation, however, DQ2 will toggle with OE or CE regardless of the address given by the user. This is because all sectors are to be erased. (See Table 6) |
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