GD25LQ40 datasheet(49/59 Pages) ELM

49 / 59 page

Rev.1.0

59 -

http://www.elm-tech.com

GD25LQ40xIGx 1.8V Uniform Sector Dual and Quad Serial Flash

Figure 37a. Enable Reset and Reset command Sequence Diagram (QPI)

CS#

SCLK

IO0

IO1

IO2

IO3

0 1

Command

66H

0 1

Command

99H

7.35. Enable Reset (66H) and Reset (99H)

If the Reset command is accepted, any on-going internal operation will be terminated and the device will return

to its default power-on state and lose all the current volatile settings, such as Volatile Status Register bits, Write

Enable Latch status (WEL), Program/Erase Suspend status, Read Parameter setting (P7-P0), Continuous Read

Mode bit setting (M7-M0) and Wrap Bit Setting (W6-W4).

The “Enable Reset (66H)” and the “Reset (99H)” commands can be issued in either SPI or QPI mode. The “Reset

(99H)”command sequence as follow: CS# goes low → Sending Enable Reset command → CS# goes high

→ CS# goes low → Sending Reset command → CS# goes high. Once the Reset command is accepted by the

device, the device will take approximately tRST=30µs to reset. During this period, no command will be accepted.

Data corruption may happen if there is an on-going or suspended internal Erase or Program operation when

Reset command sequence is accepted by the device. It is recommended to check the BUSY bit and the SUS bit

in Status Register before issuing the Reset command sequence.

Figure 37. Enable Reset and Reset command Sequence Diagram

Figure 38. Enable Reset and Reset command Sequence Diagram

7.34. Read Serial Flash Discoverable Parameter (5AH)

GD25LQ40 Datasheet(PDF) 49 Page - ELM Electronics