GD25LE256DFJS datasheet(30/83 Pages) GIGADEVICE

30 / 83 page

1.8V Uniform Sector

Dual and Quad Serial Flash

GD25LE256D

7.12. 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) or a 4-byte address (A31-A0) 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 Figure13. 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 default read

mode is 3-byte address mode, and the lower 128Mbit can be read with a single Dual I/O Fast Read (BBH) command. By

entering 4-byte address mode, or to set EN4B (S11) bit to 1, the higher 128Mbit can be read with a single Dual I/O Fast

Read (BBH) command.

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 (M7-0) after the input 3-byte address (A23-A0) or a 4-byte address (A31-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 Figure13a. If the

“Continuous Read Mode” bits (M5-4) do

not equal (1, 0), the next command requires the first BBH command code, thus returning to normal operation.

Figure13. 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

M7-0

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

Note: The device default is in 24-bit address mode. For 4-byte mode, the address length becomes 32-bit.

GD25LE256DFJS データシート(PDF) 30 Page - GigaDevice Semiconductor (Beijing) Inc.

GD25LE256DFJS データシート(HTML) 30 Page - GigaDevice Semiconductor (Beijing) Inc.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83

データシートダウンロード