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AT26DF161A Datasheet(PDF) 10 Page - ATMEL Corporation |
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AT26DF161A Datasheet(HTML) 10 Page - ATMEL Corporation |
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10 / 41 page  10 3640B–DFLASH–10/07 AT26DF161A The Byte/Page Program mode is the default programming mode after the device powers-up or resumes from a device reset. Figure 8-1. Byte Program Figure 8-2. Page Program 8.2 Sequential Program Mode The Sequential Program Mode improves throughput over the Byte/Page Program command when the Byte/Page Program command is used to program single bytes only into consecutive address locations. For example, some systems may be designed to program only a single byte of information at a time and cannot utilize a buffered Page Program operation due to design restrictions. In such a case, the system would normally have to perform multiple Byte Program operations in order to program data into sequential memory locations. This approach can add considerable system overhead and SPI bus traffic. The Sequential Programming Mode helps reduce system overhead and bus traffic by incorporat- ing an internal address counter that keeps track of the byte location to program, thereby eliminating the need to supply an address sequence to the device for every byte to program. When using the Sequential Program mode, all address locations to be programmed must be in the erased state. Before the Sequential Program mode can first be entered, the Write Enable command must have been previously issued to the device to set the WEL bit of the Status Reg- ister to a logical “1” state. To start the Sequential Program Mode, the CS pin must first be asserted, and either an opcode of ADh or AFh must be clocked into the device. For the first program cycle, three address bytes must be clocked in after the opcode to designate the first byte location to program. After the address bytes have been clocked in, the byte of data to be programmed can be sent to the SCK CS SI SO MSB MSB 2 3 1 0 00000010 67 5 410 11 9 8 12 39 37 38 33 36 35 34 31 32 29 30 OPCODE HIGH-IMPEDANCE AAAA AAA A A MSB DDDDDDD D ADDRESS BITS A23-A0 DATA IN SCK CS SI SO MSB MSB 2 3 1 0 00000010 67 5 49 839 37 38 33 36 35 34 31 32 29 30 OPCODE HIGH-IMPEDANCE AA AAA A MSB DDDDDDD D ADDRESS BITS A23-A0 DATA IN BYTE 1 MSB DDDDDDD D DATA IN BYTE n |
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