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EN29F800B45SI Datasheet(PDF) 8 Page - List of Unclassifed Manufacturers |
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EN29F800B45SI Datasheet(HTML) 8 Page - List of Unclassifed Manufacturers |
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8 / 38 page  4800 Great America Parkway, Suite 202 Tel: 408-235-8680 Santa Clara, CA 95054 Fax: 408-235-8685 8 EN29F800 Rev. E, Issue Date: 2001/07/05 To access the autoselect codes in-system; the host system can issue the autoselect command via the command register, as shown in the Command Definitions table. This method does not require VID. See “Command Definitions” for details on using the autoselect mode. Write Mode Programming is a four-bus-cycle operation. The program command sequence is initiated by writing two unlock write cycles, followed by the program set-up command. The program address and data are written next, which in turn initiate the Embedded Program algorithm. The system is not required to provide further controls or timings. The device automatically provides internally generated program pulses and verifies the programmed cell margin. The Command Definitions in Table 5 show the address and data requirements for the byte program command sequence. When the Embedded Program algorithm is complete, the device then returns to reading array data and addresses are no longer latched. The system can determine the status of the program operation by using DQ7 or DQ6. See “Write Operation Status” for information on these status bits. Any commands written to the device during the Embedded Program Algorithm are ignored. Programming is allowed in any sequence and across sector boundaries. A bit cannot be programmed from a “0” back to a “1”. Attempting to do so may halt the operation and set DQ5 to “1”, or cause the Data# Polling algorithm to indicate the operation was successful. However, a succeeding read will show that the data is still “0”. Only erase operations can convert a “0” to a “1”. Sector Protection/Unprotection The hardware sector protection feature disables both program and erase operations in any sector. The hardware sector unprotection feature re-enables both program and erase operations in previously protected sectors. Sector protection/unprotection must be implemented using programming equipment. The procedure re- quires a high voltage (VID) on address pin A9 and the control pins. Details on this method are provided in a supplement, which can be obtained by contacting a representative of Eon Silicon Devices, Inc. Temporary Sector Unprotect This feature allows temporary unprotection of previously protected sector groups to change data while in-system. The Sector Unprotect mode is activated by setting the RESET# pin to VID. During this mode, formerly protected sector groups can be programmed or erased by simply selecting the sectgor addresses. Once is removed from the RESET# pin, all the previously protected sector are protected again. See accompanying figure and timing diagrams for more details. Start Reset#=VID (note 1) Perform Erase or Program Operations Reset#=VIH Temporary Sector Unprotect Completed (note 2) Notes: 1. All protected sectors unprotected. 2. Previously protected sectors protected again. |
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