GD25Q64CFJS datasheet(22/74 Pages) GIGADEVICE

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3.3V Uniform Sector

Dual and Quad Serial Flash

GD25Q64C

7.10. Dual I/O Fast Read (BBH)

The Dual I/O Fast Read command is similar to the Dual Output Fast Read command but with the capability to input the 3-

byte address (A23-

0) and a “Continuous Read Mode” byte 2-bit per clock by SI and SO, and each bit is latched in on the

rising edge of SCLK, then the memory contents are shifted out 2-bit per clock cycle from SI and SO. The command sequence

is shown in followed Figure11. 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.

Dual I/O Fast Read with

“Continuous Read Mode”

The Dual I/O Fast Read command can further reduce

command overhead through setting the “Continuous Read Mode” bits

(M7-4) after the input 3-byte address (A23-A0).

If the “Continuous Read Mode” bits (M5-4) = (1, 0), then the next Dual I/O

Fast Read command (after CS# is raised and then lowered) does not require the BBH command code. The command

sequence is shown in followed Figure12.

If the “Continuous Read Mode” bits (M5-4) do not equal (1, 0), the next command

requires the command code, thus returning to normal oper

ation. A “Continuous Read Mode” Reset command can be used

to reset (M5-4) before issuing normal command.

Figure 11. Dual I/O Fast Read Sequence Diagram (M5-4

≠ (1, 0))

Command

BBH

CS#

SCLK

SI(IO0)

SO(IO1)

9 10 11 12 13 14 15

16 17 18 19 20 21 22 23

A23-16

A15-8

A7-0

M7-4

CS#

23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

SI(IO0)

SO(IO1)

SCLK

Byte1

Byte2

Byte3

Byte4

Dummy

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