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S29GL016A90BFER23 Datasheet(PDF) 48 Page - SPANSION |
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S29GL016A90BFER23 Datasheet(HTML) 48 Page - SPANSION |
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48 / 89 page  46 S29GL-A MirrorBit™ Flash Family S29GL-A_00_A3 April 22, 2005 Advan ce In form ati o n writes the sector address and the number of word locations, minus one, to be programmed. For example, if the system programs six unique address locations, then 05h should be written to the device. This tells the device how many write buffer addresses are loaded with data and therefore when to expect the Program Buffer to Flash command. The number of locations to program cannot exceed the size of the write buffer or the operation aborts. The fifth cycle writes the first address location and data to be programmed. The write-buffer-page is selected by address bits AMAX–A4. All subsequent address/ data pairs must fall within the selected-write-buffer-page. The system then writes the remaining address/data pairs into the write buffer. Write buffer loca- tions may be loaded in any order. The write-buffer-page address must be the same for all address/data pairs loaded into the write buffer. (This means Write Buffer Programming cannot be performed across multiple write-buffer pages.) This also means that Write Buffer Programming cannot be performed across multiple sectors. If the system at- tempts to load programming data outside of the selected write-buffer page, the operation aborts. Note that if a Write Buffer address location is loaded multiple times, the address/ data pair counter is decremented for every data load operation. The host system must therefore account for loading a write-buffer location more than once. The counter decrements for each data load operation, not for each unique write- buffer-address location. Note also that if an address location is loaded more than once into the buffer, the final data loaded for that address is programmed. Once the specified number of write buffer locations are loaded, the system must then write the Program Buffer to Flash command at the sector address. Any other address and data combination aborts the Write Buffer Programming oper- ation. The device then begins programming. Data polling should be used while monitoring the last address location loaded into the write buffer. DQ7, DQ6, DQ5, and DQ1 should be monitored to determine the device status during Write Buffer Programming. The write-buffer programming operation can be suspended using the standard program suspend/resume commands. Upon successful completion of the Write Buffer Programming operation, the device is ready to execute the next command. The Write Buffer Programming Sequence can be aborted in the following ways: Load a value that is greater than the page buffer size during the Number of Locations to Program step. Write to an address in a sector different than the one specified during the Write-Buffer-Load command. Write an Address/Data pair to a different write-buffer-page than the one se- lected by the Starting Address during the write buffer data loading stage of the operation. Write data other than the Confirm Command after the specified number of data load cycles. The abort condition is indicated by DQ1 = 1, DQ7 = DATA# (for the last address location loaded), DQ6 = toggle, and DQ5= 0. A Write-to-Buffer-Abort Reset command sequence must be written to reset the device for the next operation. Note that the Secured Silicon Sector, autoselect, and CFI functions are unavail- able when a program operation is in progress.This flash device is capable of handling multiple write buffer programming operations on the same write buffer |
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