ACE25C320G datasheet(17/37 Pages) ACE

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ACE25C320G

Uniform SECTOR Dual and Quad Serial Flash

VER 1.5

Figure11. Dual I/O Fast Read Sequence Diagram (M7-0=AXH)

Quad I/O Fast Read (EBH)

The Quad I/O Fast Read command is similar to the Dual I/O Fast Read command but with the

capability to input the 3-byte address (A23-0) and a “Continuous Read Mode” byte and 4-dummy

clock 4-bit per clock by IO0, IO1, IO3, IO4, each bit being latched in during the rising edge of SCLK,

then the memory contents are shifted out 4-bit per clock cycle from IO0, IO1, IO2, IO3. The command

sequence is shown in followed Figure12. The first byte addressed can be at any location. The address

is automatically incremented to the next higher address after each byte of data is shifted out. The

Quad Enable bit (QE) of Status Register (S9) must be set to enable for the Quad I/O Fast read

command.

Quad I/O Fast Read With “Continuous Read Mode”

The Quad I/O Fast Read command can further reduce command overhead through setting the

“Continuous Read Mode” bits (M7-0) after the input 3-byte address (A23-A0). If the “Continuous Read

Mode” bits (M7-0) =AXH, then the next Quad I/O Fast Read command (after CS# is raised and then

lowered) does not require the EBH command code. The command sequence is shown in followed

Figure13. If the “Continuous Read Mode” bits (M7-0) are any value other than AXH, the next

command requires the first EBH command code, thus returning to normal operation. A “Continuous

Read Mode” Reset command can be used to reset (M7-0) before issuing normal command.

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