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AT26DF161A Datasheet(PDF) 8 Page - ATMEL Corporation |
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AT26DF161A Datasheet(HTML) 8 Page - ATMEL Corporation |
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8 / 41 page  8 3640B–DFLASH–10/07 AT26DF161A 7. Read Commands 7.1 Read Array The Read Array command can be used to sequentially read a continuous stream of data from the device by simply providing the SCK signal once the initial starting address has been speci- fied. The device incorporates an internal address counter that automatically increments on every clock cycle. Two opcodes, 0Bh and 03h, can be used for the Read Array command. The use of each opcode depends on the maximum SCK frequency that will be used to read data from the device. The 0Bh opcode can be used at any SCK frequency up to the maximum specified by f SCK. The 03h opcode can be used for lower frequency read operations up to the maximum specified by f RDLF. To perform the Read Array operation, the CS pin must first be asserted and the appropriate opcode (0Bh or 03h) must be clocked into the device. After the opcode has been clocked in, the three address bytes must be clocked in to specify the starting address location of the first byte to read within the memory array. If the 0Bh opcode is used, then one don't care byte must also be clocked in after the three address bytes. After the three address bytes (and the one don't care byte if using opcode 0Bh) have been clocked in, additional clock cycles will result in serial data being output on the SO pin. The data is always output with the MSB of a byte first. When the last byte (1FFFFFh) of the memory array has been read, the device will continue reading back at the beginning of the array (000000h). No delays will be incurred when wrapping around from the end of the array to the beginning of the array. Deasserting the CS pin will terminate the read operation and put the SO pin into a high-imped- ance state. The CS pin can be deasserted at any time and does not require that a full byte of data be read. Figure 7-1. Read Array – 0Bh Opcode Figure 7-2. Read Array – 03h Opcode SCK CS SI SO MSB MSB 2 3 1 0 00001011 67 5 410 11 9 8 12 3942 43 41 40 37 38 33 36 35 34 31 32 29 3044 47 48 46 45 OPCODE AAAA AAA A A MSB XXXXXXX X MSBMSB DDDDDDD D D D ADDRESS BITS A23-A0 DON'T CARE DATA BYTE 1 HIGH-IMPEDANCE SCK CS SI SO MSB MSB 2 3 1 0 00000011 67 5 410 11 9 8 12 37 38 33 36 35 34 31 32 29 30 3940 OPCODE AAAA AAA A A MSBMSB DDDDDDD D D D ADDRESS BITS A23-A0 DATA BYTE 1 HIGH-IMPEDANCE |
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