S25FL256SDPNFVC datasheet(11/149 Pages) CYPRESS

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Document Number: 001-98283 Rev. *M

Page 10 of 148

S25FL128S/S25FL256S

2.6

Serial Input (SI) / IO0

This input signal is used to transfer data serially into the device. It receives instructions, addresses, and data to be programmed.

Values are latched on the rising edge of serial SCK clock signal.

SI becomes IO0 - an input and output during Dual and Quad commands for receiving instructions, addresses, and data to be

programmed (values latched on rising edge of serial SCK clock signal) as well as shifting out data (on the falling edge of SCK, in

SDR commands, and on every edge of SCK, in DDR commands).

2.7

Serial Output (SO) / IO1

This output signal is used to transfer data serially out of the device. Data is shifted out on the falling edge of the serial SCK clock

signal.

SO becomes IO1 - an input and output during Dual and Quad commands for receiving addresses, and data to be programmed

(values latched on rising edge of serial SCK clock signal) as well as shifting out data (on the falling edge of SCK, in SDR commands,

and on every edge of SCK, in DDR commands).

2.8

Write Protect (WP#) / IO2

When WP# is driven Low (VIL), during a WRR command and while the Status Register Write Disable (SRWD) bit of the Status

Register is set to a 1, it is not possible to write to the Status and Configuration Registers. This prevents any alteration of the Block

Protect (BP2, BP1, BP0) and TBPROT bits of the Status Register. As a consequence, all the data bytes in the memory area that are

protected by the Block Protect and TBPROT bits, are also hardware protected against data modification if WP# is Low during a

WRR command.

The WP# function is not available when the Quad mode is enabled (CR[1]=1). The WP# function is replaced by IO2 for input and

output during Quad mode for receiving addresses, and data to be programmed (values are latched on rising edge of the SCK signal)

as well as shifting out data (on the falling edge of SCK, in SDR commands, and on every edge of SCK, in DDR commands).

WP# has an internal pull-up resistor; when unconnected, WP# is at VIH and may be left unconnected in the host system if not used

for Quad mode.

2.9

Hold (HOLD#) / IO3

The Hold (HOLD#) signal is used to pause any serial communications with the device without deselecting the device or stopping the

serial clock.

To enter the Hold condition, the device must be selected by driving the CS# input to the logic low state. It is recommended that the

user keep the CS# input low state during the entire duration of the Hold condition. This is to ensure that the state of the interface

logic remains unchanged from the moment of entering the Hold condition. If the CS# input is driven to the logic high state while the

device is in the Hold condition, the interface logic of the device will be reset. To restart communication with the device, it is

necessary to drive HOLD# to the logic high state while driving the CS# signal into the logic low state. This prevents the device from

going back into the Hold condition.

The Hold condition starts on the falling edge of the Hold (HOLD#) signal, provided that this coincides with SCK being at the logic low

state. If the falling edge does not coincide with the SCK signal being at the logic low state, the Hold condition starts whenever the

SCK signal reaches the logic low state. Taking the HOLD# signal to the logic low state does not terminate any Write, Program or

Erase operation that is currently in progress.

During the Hold condition, SO is in high impedance and both the SI and SCK input are Don't Care.

The Hold condition ends on the rising edge of the Hold (HOLD#) signal, provided that this coincides with the SCK signal being at the

logic low state. If the rising edge does not coincide with the SCK signal being at the logic low state, the Hold condition ends

whenever the SCK signal reaches the logic low state.

The HOLD# function is not available when the Quad mode is enabled (CR1[1] =1). The Hold function is replaced by IO3 for input

and output during Quad mode for receiving addresses, and data to be programmed (values are latched on rising edge of the SCK

signal) as well as shifting out data (on the falling edge of SCK, in SDR commands, and on every edge of SCK, in DDR commands).

The HOLD# signal has an internal pull-up resistor and may be left unconnected in the host system if not used for Quad mode.

S25FL256SDPNFVC Datasheet(PDF) 11 Page - Cypress Semiconductor

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