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FM25D04C-1ACA3T Datasheet PDF : 61 Pages
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11.2.12 Fast Read Quad I/O (EBh)
The Fast Read Quad I/O (EBh) instruction is similar to the Fast Read Dual I/O (BBh) instruction
except that address and data bits are input and output through four pins IO0, IO1, IO2, and IO3 and
four Dummy clock are required prior to the data output. The Quad I/O dramatically reduces
instruction overhead allowing faster random access for code executing (XIP) directly from the
Quad SPI. The Quad Enable bit (QE) of Status Register-2 must be set to enable the Fast read
Quad I/O Instruction.
The Fast Read Quad I/O instruction can further reduce instruction overhead through setting the
Mode bits (M7-0) after the input Address bits (A23-0), as shown in figure 12a. The upper nibble of
the Mode (M7-4) controls the length of the next Fast Read Quad I/O instruction through the
instruction or exclusion of the first byte instruction code. The lower nibble bits of the Mode (M3-0)
are don’t care (“X”). However, the IO pins should be high-impedance prior to the falling edge of the
first data out clock.
If the Mode bits (M7-0) equal “Ax” hex, then the next Fast Read Quad I/O instruction (after /CS is
raised and then lowered) does not require the EBh instruction code, as shown in figure 12b. This
reduces the instruction sequence by eight clocks allows the address to be immediately entered
after /CS is asserted low. If the Mode bits (M7-0) are any value other than “Ax” hex, the next
instruction (after /CS is raised and then lowered) requires the first byte instruction code, thus
retuning normal operation. A Mode Bit Reset can be used to reset Mode Bits (M7-0) before issuing
normal instructions (See 11.2.25 for detailed descriptions.)
Mode 3
CLK Mode 0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
40 40 40 4 0
IO Switches from
Input to Output
40 40 4
51 5 151 51
51 51 5
62 62 62 6 2
62 62 6
73 73 73 7 3
73 73 7
A23-16 A15-8 A7-0 M7-0 Dummy Dummy BByyttee13 BBytyet2e4
Figure 12a. Fast Read Quad Input/Output Instruction Sequence Diagram (M7-0 = 0xh or NOT Axh)
preliminary(Aug.18.2010) 27
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