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Giải thích chi tiết về linh kiện  64-Mbit, 1.7V Minimum SPI Serial Flash Memory with Dual I/O, Quad I/O and QPI Support
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AT25SL641
DS-25SL641–113F–12/2018
Figure 7-10. Set Read Parameters Instruction (QPI Mode)
7.9
Read Data (03h)
The Read Data instruction is used to read data out from the device. The instruction is initiated by driving the CS pin low
and then sending the instruction code 03h, followed by a 24-bit address (A23- A0), onto the SI pin. After the address is
received, the data byte of the addressed memory location is shifted out on the SO pin at the falling edge of SCK with the
most significant bit (MSB) first. The address is automatically incremented to the next higher address and the next byte of
data is shifted out, allowing for a continuous stream of data. This means that the entire memory can be accessed with a
single instruction as long as the clock continues.
The instruction is completed by driving CS high. The Read Data instruction sequence is shown in Figure 7-11. If a Read Data
instruction is issued while an Erase, Program or Write Status Register cycle is in process (BUSY = 1) the instruction is ignored
Table 7-6.
Encoding of the P[5:4] Bits
P5, P4
Dummy
Clocks
Maximum
Read Frequency
00
4
80 MHz
01
4
80 MHz
10
6
104 MHz
11
8
133 MHz
Table 7-7.
Encoding of the P[1:0] Bits
P1, P0
Wrap Length
0 0
8-byte
0 1
16-byte
1 0
32-byte
1 1
64-byte



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