W25Q128FVEIG datasheet(15/97 Pages) WINBOND | SERIAL FLASH MEMORY WITH DUAL/QUAD SPI & QPI

W25Q128FV

Publication Release Date: October 01, 2012

- 14 -

Revision D

6.1.6

Software Reset & Hardware /RESET pin

The W25Q128FV can be reset to the initial power-on state by a software Reset sequence, either in SPI

mode or QPI mode. This sequence must include two consecutive commands: Enable Reset (66h) &

Reset (99h). If the command sequence is successfully accepted, the device will take approximately 30uS

(tRST) to reset. No command will be accepted during the reset period.

For the WSON-8 and TFBGA package types, W25Q128FV can also be configured to utilize a hardware

/RESET pin. The HOLD/RST bit in the Status Register-3 is the configuration bit for /HOLD pin function or

RESET pin function. When HOLD/RST=0 (factory default), the pin acts as a /HOLD pin as described

above; when HOLD/RST=1, the pin acts as a /RESET pin. Drive the /RESET pin low for a minimum period

of ~1us (tRESET*) will reset the device to its initial power-on state. Any on-going Program/Erase operation

will be interrupted and data corruption may happen. While /RESET is low, the device will not accept any

command input.

If QE bit is set to 1, the /HOLD or /RESET function will be disabled, the pin will become one of the four

data I/O pins.

For the SOIC-16 package, W25Q128FV provides a dedicated /RESET pin in addition to the /HOLD (IO3)

pin as illustrated in Figure 1b. Drive the /RESET pin low for a minimum period of ~1us (tRESET*) will reset

the device to its initial power-on state. The HOLD/RST bit or QE bit in the Status Register will not affect

the function of this dedicated /RESET pin.

Hardware /RESET pin has the highest priority among all the input signals. Drive /RESET low for a

minimum period of ~1us (tRESET*) will interrupt any on-going external/internal operations, regardless the

status of other SPI signals (/CS, CLK, IOs, /WP and/or /HOLD).

Note: While a faster /RESET pulse (as short as a few hundred nanoseconds) will often reset the device, a

1us minimum is recommended to ensure reliable operation.

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