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EN29F08090SI Datasheet(PDF) 7 Page - List of Unclassifed Manufacturers |
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EN29F08090SI Datasheet(HTML) 7 Page - List of Unclassifed Manufacturers |
7 / 37 page 4800 Great America Parkway, Suite 202 Tel: 408-235-8680 Santa Clara, CA 95054 Fax: 408-235-8685 7 EN29F080 Rev. C, Issue Date: 2001/07/05 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 Group Protection/Unprotection The hardware sector protection feature disables both program and erase operations in any sector. Each group consists of two adjacent sectors. The Sector Group Addresses table shows how the sectors are grouped, and the address range that each sector group contains. The hardware sector group unprotection feature re-enables both program and erase operations in previously protected sector groups. 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 Group Unprotect This feature allows temporary unprotection of previously protected sector groups to change data while in-system. The Sector Group Unprotect mode is activated by setting the RESET# pin to VID (10.5 V to 11.5 V). During this mode, formerly protected sector groups can be programmed or erased by simply selecting the sector group addresses. Once VID is removed from the RESET# pin, all the previously protected sector groups are protected again. See accompanying figure and timing diagrams for more details. Sector Group Addresses Sector Group A19 A18 A17 Sectors SGA0 0 0 0 SA0-SA1 SGA1 0 0 1 SA2-SA3 SGA2 0 1 0 SA4-SA5 SGA3 0 1 1 SA6-SA7 SGA4 1 0 0 SA8-SA9 SGA5 1 0 1 SA10-SA11 SGA6 1 1 0 SA12-SA13 SGA7 1 1 1 SA14-SA15 Start Reset#=VID (note 1) Perform Erase or Program Operations Reset#=VIH Temporary Sector Group Unprotect Completed (note 2) Notes: 1. All protected sector groups unprotected. 2. Previously protected sector groups protected again. 3. VIH = Logic High |
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