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LE25U81AQE Datasheet(PDF) 6 Page - ON Semiconductor |
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LE25U81AQE Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 22 page LE25U81AQE No.A2199-6/22 2. Dual read There are two Dual read commands, the Dual Output read command and the Dual I/O read command. They achieve the twice speed-up from a High-speed read command. 2-1. Dual Output read command The Dual Output read command changes SI/SIO0 into the output pin function in addition to SO/SIO1, makes the data output x2 bit and has achieved a high-speed output. Consisting of the first through fifth bus cycles, the Dual Output read command inputs the 24-bit addresses and 8 dummy bits following (3Bh). DATA1 (Bit7, BIt5, Bit3 and Bit1) is output from SI/SIO0 and DATA0 (Bit6, Bit4, Bit2 and Bit0) is output from SO/SIO1 on the falling clock edge of fifth bus cycle bit 0 as a reference. "Figure 5-a Dual Output read" shows the timing waveforms. Figure 5-a Dual Output read 2-2. Dual I/O read command The Dual I/O read command changes SI/SIO0 and SO/SIO1 into the input output pin function, makes the data input and output x2 bit and has achieved a high-speed output. Consisting of the first through third bus cycles, the Dual I/O read command inputs the 24-bit addresses and 4 dummy clocks following (BBh). The format of the address input and the dummy bit input is the x2 bit input. Add1 (A23, A21, -, A3 and A1) is input from S0/SIO1 and Add0 (A22, A20, -, A2 and A0) is input from SI/SIO0. 2CLK of the latter half of the dummy clock is in the state of high impedance, the controller can switch I/O for this period. DATA1 (Bit7, BIt5, Bit3 and Bit1) is output from SI/SIO0 and DATA0 (Bit6, Bit4, Bit2 and Bit0) is output from SO/SIO1 on the falling clock edge of third bus cycle bit 0 as a reference. "Figure 5-b Dual I/O Read" shows the timing waveforms. Figure 5-b Dual I/O Read When SCK is input continuously after the read command has been input and the data in the designated addresses has been output, the address is automatically incremented inside the device while SCK is being input, and the corresponding data is output in sequence. If the SCK input is continued after the internal address arrives at the highest address (FFFFFh), the internal address returns to the lowest address (00000h), and data output is continued. By setting the logic level of CS to high, the device is deselected, and the read cycle ends. While the device is deselected, the output pin SO is in a high-impedance state. CS High Impedance DATA1 DATA1 DATA1 SCK SO/SIO1 SI/SIO0 3Bh Add. Add. Add. 15 MSB MSB 0 1 2 3 4 5 6 7 8 23 16 24 31 32 39 40 43 44 47 Mode3 Mode0 8CLK MSB MSB N+2 N+1 N DATA0 DATA0 DATA0 4CLK 4CLK DATA0 b6,b4,b2,b0 DATA1 b7,b5,b3,b1 dummy bit CS High Impedance DATA1 DATA1 DATA1 SCK SO/SIO1 SI/SIO0 BBh X Add1:A22,A20-A2,A0 MSB MSB 0 1 2 3 4 5 6 7 8 19 22 23 24 27 28 31 Mode3 Mode0 8CLK MSB MSB N+2 N+1 N DATA0 DATA0 DATA0 4CLK DATA0 b6,b4,b2,b0 DATA1 b7,b5,b3,b1 dummy bit 20 21 Add2:A23,A21-A3,A1 X 2CLK 2CLK 12CLK |
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