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S25FL128SDPNFAQ Datasheet(PDF) 98 Page - Cypress Semiconductor |
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S25FL128SDPNFAQ Datasheet(HTML) 98 Page - Cypress Semiconductor |
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98 / 149 page ![]() Document Number: 001-98283 Rev. *M Page 97 of 148 S25FL128S/S25FL256S Although the data learning pattern (DLP) is programmable, the following example shows example of the DLP of 34h. The DLP 34h (or 00110100) will be driven on each of the active outputs (i.e. all four SIOs on a x4 device, both SIOs on a x2 device and the single SO output on a x1 device). This pattern was chosen to cover both DC and AC data transition scenarios. The two DC transition scenarios include data low for a long period of time (two half clocks) followed by a high going transition (001) and the complementary low going transition (110). The two AC transition scenarios include data low for a short period of time (one half clock) followed by a high going transition (101) and the complementary low going transition (010). The DC transitions will typically occur with a starting point closer to the supply rail than the AC transitions that may not have fully settled to their steady state (DC) levels. In many cases the DC transitions will bound the beginning of the data valid period and the AC transitions will bound the ending of the data valid period. These transitions will allow the host controller to identify the beginning and ending of the valid data eye. Once the data eye has been characterized the optimal data capture point can be chosen. See Section 7.5.12 SPI DDR Data Learning Registers on page 56 for more details. Figure 9.27 DDR Dual I/O Read Initial Access (4-byte Address, BEh or BDh [ExtAdd=1], EHPLC= 01b) Figure 9.28 Continuous DDR Dual I/O Read Subsequent Access (4-byte Address, EHPLC= 01b) Figure 9.29 DDR Dual I/O Read (4-byte Address, BEh or BDh [ExtAdd=1], HPLC=00b) 0 1 2 3 4 5 6 7 8 15 16 17 18 19 20 21 22 23 24 25 Instruction 32b Add Mode Optional DLP per data 8 cycles 8 cycles 2 cycles 5 cycles Dummy 2 cycles 7 6 5 4 3 2 1 0 30 22 2 0 6 4 2 0 7 6 5 4 3 2 1 0 6 4 2 0 6 31 22 3 1 7 5 3 1 7 6 5 4 3 2 1 0 7 5 3 1 7 CS# SCK IO0 IO1 0 8 9 10 11 12 13 14 8 15 16 17 32b Add Mode Optional DLP per data 8 cycles 2 cycles 5 cycles Dummy 2 cycles 30 22 2 0 6 4 2 0 7 6 5 4 3 2 1 0 6 4 2 0 6 31 22 3 1 7 5 3 1 7 6 5 4 3 2 1 0 7 5 3 1 7 CS# SCK IO0 IO1 0 1 2 3 4 5 6 7 8 15 16 17 18 19 20 21 22 23 24 Instruction 32b Add Dummy per data 8 cycles 8 cycles 6 cycles 2 cycles 7 6 5 4 3 2 1 0 30 2 0 6 4 2 0 6 31 3 1 7 5 3 1 7 2 CS# SCK IO0 IO1 |
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