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S25FL256SAGMFVR00

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P29
©2011 Silicon Storage Technology, Inc. DS25076A 10/11
4
512 Kbit SPI Serial Flash
SST25VF512
Data Sheet
A
Microchip Technology Company
Pin Description
Figure 1: Pin Assignments
Table 1: Pin Description
Symbol Pin Name Functions
SCK Serial Clock To provide the timing of the serial interface.
Commands, addresses, or input data are latched on the rising edge of the clock input,
while output data is shifted out on the falling edge of the clock input.
SI Serial Data
Input
To transfer commands, addresses, or data serially into the device.
Inputs are latched on the rising edge of the serial clock.
SO Serial Data
Output
To transfer data serially out of the device.
Data is shifted out on the falling edge of the serial clock.
CE# Chip Enable The device is enabled by a high to low transition on CE#. CE# must remain low for the
duration of any command sequence.
WP# Write Protect The Write Protect (WP#) pin is used to enable/disable BPL bit in the status register.
HOLD# Hold To temporarily stop serial communication with SPI flash memory without resetting the
device.
V
DD
Power Sup-
ply
To provide power supply (2.7-3.6V).
V
SS
Ground
T1.7 25076
1
2
3
4
8
7
6
5
CE#
SO
WP#
V
SS
V
DD
HOLD#
SCK
SI
Top View
1192 08-soic P1.4
8-lead SOIC
8-contact WSON
1
2
3
4
8
7
6
5
CE#
SO
WP#
V
SS
Top View
V
DD
HOLD#
SCK
SI
1192 08-wson P1a.6
©2011 Silicon Storage Technology, Inc. DS25076A 10/11
5
512 Kbit SPI Serial Flash
SST25VF512
Data Sheet
A
Microchip Technology Company
Memory Organization
The SST25VF512 SuperFlash memory array is organized in 4 KByte sectors with 32 KByte overlay
blocks.
Device Operation
The SST25VF512 is accessed through the SPI (Serial Peripheral Interface) bus compatible protocol.
The SPI bus consist of four control lines; Chip Enable (CE#) is used to select the device, and data is
accessed through the Serial Data Input (SI), Serial Data Output (SO), and Serial Clock (SCK).
The SST25VF512 supports both Mode 0 (0,0) and Mode 3 (1,1) of SPI bus operations. The difference
between the two modes, as shown in Figure 2, is the state of the SCK signal when the bus master is in
Stand-by mode and no data is being transferred. The SCK signal is low for Mode 0 and SCK signal is
high for Mode 3. For both modes, the Serial Data In (SI) is sampled at the rising edge of the SCK clock
signal and the Serial Data Output (SO) is driven after the falling edge of the SCK clock signal.
Figure 2: SPI Protocol
1192 F34.6
MODE 3
SCK
SI
SO
CE#
MODE 3
DON T CARE
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
MODE 0MODE 0
HIGH IMPEDANCE
MSB
MSB
©2011 Silicon Storage Technology, Inc. DS25076A 10/11
6
512 Kbit SPI Serial Flash
SST25VF512
Data Sheet
A
Microchip Technology Company
Hold Operation
HOLD# pin is used to pause a serial sequence underway with the SPI flash memory without resetting
the clocking sequence. To activate the HOLD# mode, CE# must be in active low state. The HOLD#
mode begins when the SCK active low state coincides with the falling edge of the HOLD# signal. The
HOLD mode ends when the HOLD# signal’s rising edge coincides with the SCK active low state.
If the falling edge of the HOLD# signal does not coincide with the SCK active low state, then the device
enters Hold mode when the SCK next reaches the active low state. Similarly, if the rising edge of the
HOLD# signal does not coincide with the SCK active low state, then the device exits in Hold mode
when the SCK next reaches the active low state. See Figure 3 for Hold Condition waveform.
Once the device enters Hold mode, SO will be in high-impedance state while SI and SCK can be V
IL
or V
IH
.
If CE# is driven active high during a Hold condition, it resets the internal logic of the device. As long as
HOLD# signal is low, the memory remains in the Hold condition. To resume communication with the device,
HOLD# must be driven active high, and CE# must be driven active low. See Figure 17 for Hold timing.
Figure 3: Hold Condition Waveform
Write Protection
The SST25VF512 provides software Write protection. The Write Protect pin (WP#) enables or disables
the lock-down function of the status register. The Block-Protection bits (BP1, BP0, and BPL) in the sta-
tus register provide Write protection to the memory array and the status register. See Table 3 for Block-
Protection description.
Write Protect Pin (WP#)
The Write Protect (WP#) pin enables the lock-down function of the BPL bit (bit 7) in the status register.
When WP# is driven low, the execution of the Write-Status-Register (WRSR) instruction is determined by
the value of the BPL bit (see Table 2). When WP# is high, the lock-down function of the BPL bit is disabled.
Table 2: Conditions to execute Write-Status-Register (WRSR) Instruction
WP# BPL Execute WRSR Instruction
L 1 Not Allowed
L 0 Allowed
H X Allowed
T2.0 25076
Active Hold Active Hold Active
1192 F44.0
SCK
HOLD#
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P29

S25FL256SAGMFVR00

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Manufacturer:
Cypress Semiconductor
Description:
NOR Flash Nor
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