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SST25VF040-20-4E-QAE Datasheet(PDF) 10 Page - Silicon Storage Technology, Inc |
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SST25VF040-20-4E-QAE Datasheet(HTML) 10 Page - Silicon Storage Technology, Inc |
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10 / 23 page  10 EOL Product Data Sheet 2 Mbit / 4 Mbit SPI Serial Flash SST25VF040 ©2006 Silicon Storage Technology, Inc. S71231(04)-00-000 10/06 Auto Address Increment (AAI) Program The AAI program instruction allows multiple bytes of data to be programmed without re-issuing the next sequential address location. This feature decreases total program- ming time when the entire memory array is to be pro- grammed. An AAI program instruction pointing to a protected memory area will be ignored. The selected address range must be in the erased state (FFH) when ini- tiating an AAI program instruction. Prior to any write operation, the Write-Enable (WREN) instruction must be executed. The AAI program instruction is initiated by executing an 8-bit command, AFH, followed by address bits [A23-A0]. Following the addresses, the data is input sequentially from MSB (bit 7) to LSB (bit 0). CE# must be driven high before the AAI program instruction is executed. The user must poll the BUSY bit in the software status register or wait TBP for the completion of each inter- nal self-timed Byte-Program cycle. Once the device com- pletes programming byte, the next sequential address may be program, enter the 8-bit command, AFH, followed by the data to be programmed. When the last desired byte had been programmed, execute the Write-Disable (WRDI) instruction, 04H, to terminate AAI. After execution of the WRDI command, the user must poll the Status register to ensure the device completes programming. See Figure 7 for AAI programming sequence. There is no wrap mode during AAI programming; once the highest unprotected memory address is reached, the device will exit AAI operation and reset the Write-Enable- Latch bit (WEL = 0). FIGURE 7: Auto Address Increment (AAI) Program Sequence CE# SI SCK A[23:16] A[15:8] A[7:0] AF Data Byte 1 AF Data Byte 2 CE# SI SO SCK Write Disable (WRDI) Instruction to terminate AAI Operation Read Status Register (RDSR) Instruction to verify end of AAI Operation 04 Last Data Byte AF 05 DOUT MODE 3 MODE 0 TBP TBP TBP 1231 F06.1 0 1 2 3 4 5 6 7 8 3233343536373839 15 16 23 24 31 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 01 01234567 0123456789 10 11 12 13 14 15 0123456789 10 11 12 13 14 15 |
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