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SST38VF6403-90-5I-B3KE Datasheet(PDF) 10 Page - Microchip Technology |
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SST38VF6403-90-5I-B3KE Datasheet(HTML) 10 Page - Microchip Technology |
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10 / 64 page  ©2015 DS-20005015B 08/15 10 64 Mbit (x16) Advanced Multi-Purpose Flash Plus SST38VF6401 / SST38VF6402 / SST38VF6403 / SST38VF6404 Not Recommended for New Designs During the Program operation, the only valid reads are Data# Polling, Toggle Bits, and RY/BY#. During the internal Program operation, the host is free to perform additional tasks. Any commands issued during the internal Program operation are ignored. During the command sequence, WP# should be statically held high or low. When programming more than a few words, Microchip recommends Write-Buffer Programming. Write-Buffer Programming The SST38VF6401/6402/6403/6404 offer Write-Buffer Programming, a feature that enables faster effective word programming. To use this feature, write up to 16 words with the Write-to-Buffer com- mand, then use the Program Buffer-to-Flash command to program the Write-Buffer to memory. The Write-to-Buffer command consists of between 5 and 20 write cycles. The total number of write cycles in the Write-to-Buffer command sequence is equal to the number of words to be written to the buffer plus four. The first three cycles in the command sequence tell the device that a Write-to-Buffer operation will begin. The fourth cycle tells the device the number of words to be written into the buffer and the block address of these words. Specifically, the write cycle consists of a block address and a data value called the Word Count (WC), which is the number of words to be written to the buffer minus one. If the WC is greater than 15, the maximum buffer size minus 1, then the operation aborts. For the fifth cycle, and all subsequent cycles of the Write-to-Buffer command, the command sequence consists of the addresses and data of the words to be written into the buffer. All of these cycles must have the same A21 - A4 address, otherwise the operation aborts. The number of Write cycles required is equal to the number of words to be written into the Write-Buffer, which is equal to WC plus one. The correct number of Write cycles must be issued or the operation will abort. Each Write cycle decre- ments the Write-Buffer counter, even if two or more of the Write cycles have identical address values. Only the final data loaded for each buffer location is held in the Write-Buffer. Once the Write-to-Buffer command sequence is completed, the Program Buffer-to-Flash command should be issued to program the Write-Buffer contents to the specified block in memory. The block address (i.e. A21 - A15) in this command must match the block address in the 4th write cycle of the Write-to-Buffer command or the operation aborts. See Table 11 for details on Write-to-Buffer and Pro- gram-Buffer-to-Flash commands. While issuing these command sequences, the Write-Buffer Programming Abort detection bit (DQ1) indicates if the operation has aborted. There are several cases in which the device can abort: • In the fourth write cycle of the Write-to-Buffer command, if the WC is greater than 15, the opera- tion aborts. • In the fifth and all subsequent cycles of the Write-to-Buffer command, if the address values, A21 - A4, are not identical, the operation aborts. • If the number of write cycles between the fifth to the last cycle of the Write-to-Buffer command is greater than WC +1, the operation aborts. • After completing the Write-to-Buffer command sequence, issuing any command other than the Program Buffer-to-Flash command, aborts the operation. • Loading a block address, i.e. A21-A15, in the Program Buffer-to-Flash command that does not match the block address used in the Write-to-Buffer command aborts the operation. |
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