16 Mbit SPI Serial Flash
SST25VF016B
A Microchip Technology Company
Data Sheet
SST's 25 series Serial Flash family features a four-wire, SPI-compatible interface
that allows for a low pin-count package which occupies less board space and ultimately lowers total system costs. The SST25VF016B devices are enhanced with
improved operating frequency and lower power consumption. SST25VF016B SPI
serial flash memories are manufactured with SST's proprietary, high-performance
CMOS SuperFlash technology. The split-gate cell design and thick-oxide tunneling injector attain better reliability and manufacturability compared with alternate
approaches.
Features
• Single Voltage Read and Write Operations
– 2.7-3.6V
• Serial Interface Architecture
– SPI Compatible: Mode 0 and Mode 3
• High Speed Clock Frequency
– Up to 80 MHz
• Superior Reliability
– Endurance: 100,000 Cycles (typical)
– Greater than 100 years Data Retention
• Low Power Consumption:
– Active Read Current: 10 mA (typical)
– Standby Current: 5 µA (typical)
• Flexible Erase Capability
– Uniform 4 KByte sectors
– Uniform 32 KByte overlay blocks
– Uniform 64 KByte overlay blocks
• Fast Erase and Byte-Program:
– Chip-Erase Time: 35 ms (typical)
– Sector-/Block-Erase Time: 18 ms (typical)
– Byte-Program Time: 7 µs (typical)
• Auto Address Increment (AAI) Programming
– Decrease total chip programming time over Byte-Program operations
• End-of-Write Detection
– Software polling the BUSY bit in Status Register
– Busy Status readout on SO pin in AAI Mode
• Hold Pin (HOLD#)
– Suspends a serial sequence to the memory
without deselecting the device
• Write Protection (WP#)
– Enables/Disables the Lock-Down function of the status
register
• Software Write Protection
– Write protection through Block-Protection bits in status
register
• Temperature Range
– Commercial: 0°C to +70°C
– Industrial: -40°C to +85°C
• Packages Available
– 8-lead SOIC (200 mils)
– 8-contact WSON (6mm x 5mm)
• All devices are RoHS compliant
©2011 Silicon Storage Technology, Inc.
www.microchip.com
DS25044A
08/11
16 Mbit SPI Serial Flash
SST25VF016B
A Microchip Technology Company
Data Sheet
Product Description
SST’s 25 series Serial Flash family features a four-wire, SPI-compatible interface that allows for a low
pin-count package which occupies less board space and ultimately lowers total system costs. The
SST25VF016B devices are enhanced with improved operating frequency and even lower power consumption than the original SST25VFxxxA devices. SST25VF016B SPI serial flash memories are manufactured with SST’s proprietary, high-performance CMOS SuperFlash technology. The split-gate cell
design and thick-oxide tunneling injector attain better reliability and manufacturability compared with
alternate approaches.
The SST25VF016B devices significantly improve performance and reliability, while lowering power
consumption. The devices write (Program or Erase) with a single power supply of 2.7-3.6V for
SST25VF016B. The total energy consumed is a function of the applied voltage, current, and time of
application. Since for any given voltage range, the SuperFlash technology uses less current to program and has a shorter erase time, the total energy consumed during any Erase or Program operation
is less than alternative flash memory technologies.
The SST25VF016B device is offered in both 8-lead SOIC (200 mils) and 8-contact WSON (6mm x
5mm) packages. See Figure 2 for pin assignments.
©2011 Silicon Storage Technology, Inc.
DS25044A
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08/11
16 Mbit SPI Serial Flash
SST25VF016B
A Microchip Technology Company
Data Sheet
Block Diagram
SuperFlash
Memory
X - Decoder
Address
Buffers
and
Latches
Y - Decoder
I/O Buffers
and
Data Latches
Control Logic
Serial Interface
CE#
SCK
SI
SO
WP#
HOLD#
1271 B1.0
Figure 1: Functional Block Diagram
©2011 Silicon Storage Technology, Inc.
DS25044A
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08/11
16 Mbit SPI Serial Flash
SST25VF016B
A Microchip Technology Company
Data Sheet
Pin Description
CE#
1
8
VDD
SO
2
7
HOLD#
CE#
1
SO
2
8
VDD
7
HOLD#
Top View
Top View
WP#
3
6
SCK
WP#
3
6
SCK
VSS
4
5
SI
VSS
4
5
SI
1271 08-wson QA P2.0
1271 08-soic S2A P1.0
8-Lead SOIC
8-Contact WSON
Figure 2: 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.
Outputs Flash busy status during AAI Programming when reconfigured as RY/
BY# pin. See “Hardware End-of-Write Detection” on page 12 for details.
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
VDD
Power Supply
VSS
Ground
To temporarily stop serial communication with SPI flash memory without resetting
the device.
To provide power supply voltage: 2.7-3.6V for SST25VF016B
T1.0 25044
©2011 Silicon Storage Technology, Inc.
DS25044A
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08/11
16 Mbit SPI Serial Flash
SST25VF016B
A Microchip Technology Company
Data Sheet
Memory Organization
The SST25VF016B SuperFlash memory array is organized in uniform 4 KByte erasable sectors with
32 KByte overlay blocks and 64 KByte overlay erasable blocks.
Device Operation
The SST25VF016B 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 SST25VF016B 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 3, 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.
CE#
SCK
SI
MODE 3
MODE 3
MODE 0
MODE 0
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
MSB
HIGH IMPEDANCE
DON T CARE
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
SO
MSB
1271 SPIprot.0
Figure 3: SPI Protocol
©2011 Silicon Storage Technology, Inc.
DS25044A
5
08/11
16 Mbit SPI Serial Flash
SST25VF016B
A Microchip Technology Company
Data Sheet
Hold Operation
The 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 4 for Hold Condition waveform.
Once the device enters Hold mode, SO will be in high-impedance state while SI and SCK can be VIL or VIH.
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 24 for Hold
timing.
SCK
HOLD#
Active
Hold
Active
Hold
Active
1271 HoldCond.0
Figure 4: Hold Condition Waveform
Write Protection
SST25VF016B provides software Write protection. The Write Protect pin (WP#) enables or disables
the lock-down function of the status register. The Block-Protection bits (BP3, BP2, BP1, BP0, and BPL)
in the status register provide Write protection to the memory array and the status register. See Table 4
for the 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
L
1
Execute WRSR Instruction
Not Allowed
L
0
Allowed
H
X
Allowed
T2.0 25044
©2011 Silicon Storage Technology, Inc.
DS25044A
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08/11
16 Mbit SPI Serial Flash
SST25VF016B
A Microchip Technology Company
Data Sheet
Status Register
The software status register provides status on whether the flash memory array is available for any
Read or Write operation, whether the device is Write enabled, and the state of the Memory Write protection. During an internal Erase or Program operation, the status register may be read only to determine the completion of an operation in progress. Table 3 describes the function of each bit in the
software status register.
Table 3: Software Status Register
Default at
Power-up
Read/Write
1 = Internal Write operation is in progress
0 = No internal Write operation is in progress
0
R
WEL
1 = Device is memory Write enabled
0 = Device is not memory Write enabled
0
R
2
BP0
Indicate current level of block write protection (See Table 4)
1
R/W
3
BP1
Indicate current level of block write protection (See Table 4)
1
R/W
4
BP2
Indicate current level of block write protection (See Table 4)
1
R/W
5
BP3
Indicate current level of block write protection (See Table 4)
0
R/W
6
AAI
Auto Address Increment Programming status
1 = AAI programming mode
0 = Byte-Program mode
0
R
7
BPL
1 = BP3, BP2, BP1, BP0 are read-only bits
0 = BP3, BP2, BP1, BP0 are read/writable
0
R/W
Bit
Name
Function
0
BUSY
1
T3.0 25044
Busy
The Busy bit determines whether there is an internal Erase or Program operation in progress. A “1” for
the Busy bit indicates the device is busy with an operation in progress. A “0” indicates the device is
ready for the next valid operation.
Write Enable Latch (WEL)
The Write-Enable-Latch (WEL) bit indicates the status of the internal memory Write Enable Latch. If
the Write-Enable-Latch bit is set to “1”, it indicates the device is Write enabled. If the bit is set to “0”
(reset), it indicates the device is not Write enabled and does not accept any memory Write (Program/
Erase) commands. The Write-Enable-Latch bit is automatically reset under the following conditions:
•
•
•
•
•
•
•
•
Power-up
Write-Disable (WRDI) instruction completion
Byte-Program instruction completion
Auto Address Increment (AAI) programming is completed or reached its highest unprotected memory address
Sector-Erase instruction completion
Block-Erase instruction completion
Chip-Erase instruction completion
Write-Status-Register instructions
©2011 Silicon Storage Technology, Inc.
DS25044A
7
08/11
16 Mbit SPI Serial Flash
SST25VF016B
A Microchip Technology Company
Data Sheet
Auto Address Increment (AAI)
The Auto Address Increment Programming-Status bit provides status on whether the device is in Auto
Address Increment (AAI) programming mode or Byte-Program mode. The default at power up is ByteProgram mode.
Block Protection (BP3,BP2, BP1, BP0)
The Block-Protection (BP3, BP2, BP1, BP0) bits define the size of the memory area, as defined in
Table 4, to be software protected against any memory Write (Program or Erase) operation. The WriteStatus-Register (WRSR) instruction is used to program the BP3, BP2, BP1 and BP0 bits as long as
WP# is high or the Block-Protect-Lock (BPL) bit is 0. Chip-Erase can only be executed if Block-Protection bits are all 0. After power-up, BP3, BP2, BP1 and BP0 are set to 1.
Block Protection Lock-Down (BPL)
WP# pin driven low (VIL), enables the Block-Protection-Lock-Down (BPL) bit. When BPL is set to 1, it
prevents any further alteration of the BPL, BP3, BP2, BP1, and BP0 bits. When the WP# pin is driven
high (VIH), the BPL bit has no effect and its value is “Don’t Care”. After power-up, the BPL bit is reset to
0.
Table 4: Software Status Register Block Protection for SST25VF016B1
Status Register Bit2
Protection Level
Protected Memory Address
BP3
BP2
BP1
BP0
16 Mbit
None
X
0
0
0
None
Upper 1/32
X
0
0
1
1F0000H-1FFFFFH
Upper 1/16
X
0
1
0
1E0000H-1FFFFFH
Upper 1/8
X
0
1
1
1C0000H-1FFFFFH
Upper 1/4
X
1
0
0
180000H-1FFFFFH
Upper 1/2
X
1
0
1
100000H-1FFFFFH
All Blocks
X
1
1
0
000000H-1FFFFFH
All Blocks
X
1
1
1
000000H-1FFFFFH
T4.0 25044
1. X = Don’t Care (RESERVED) default is “0
2. Default at power-up for BP2, BP1, and BP0 is ‘111’. (All Blocks Protected)
©2011 Silicon Storage Technology, Inc.
DS25044A
8
08/11
16 Mbit SPI Serial Flash
SST25VF016B
A Microchip Technology Company
Data Sheet
Instructions
Instructions are used to read, write (Erase and Program), and configure the SST25VF016B. The
instruction bus cycles are 8 bits each for commands (Op Code), data, and addresses. Prior to executing any Byte-Program, Auto Address Increment (AAI) programming, Sector-Erase, Block-Erase, WriteStatus-Register, or Chip-Erase instructions, the Write-Enable (WREN) instruction must be executed
first. The complete list of instructions is provided in Table 5. All instructions are synchronized off a high
to low transition of CE#. Inputs will be accepted on the rising edge of SCK starting with the most significant bit. CE# must be driven low before an instruction is entered and must be driven high after the last
bit of the instruction has been shifted in (except for Read, Read-ID, and Read-Status-Register instructions). Any low to high transition on CE#, before receiving the last bit of an instruction bus cycle, will
terminate the instruction in progress and return the device to standby mode. Instruction commands
(Op Code), addresses, and data are all input from the most significant bit (MSB) first.
Table 5: Device Operation Instructions
Instruction
Read
High-Speed
Read
4 KByte Sector-Erase3
Description
Read Memory at 25 MHz
Read Memory at 80 MHz
Op Code Cycle1
0000 0011b (03H)
0000 1011b (0BH)
Address
Cycle(s)2
3
3
Dummy
Cycle(s)
0
1
Data
Cycle(s)
1 to
1 to
Maximum
Frequency
25 MHz
80 MHz
Erase 4 KByte of
memory array
0010 0000b (20H)
3
0
0
80 MHz
32 KByte
Block-Erase4
Erase 32 KByte block
of memory array
0101 0010b (52H)
3
0
0
80 MHz
64 KByte
Block-Erase5
Erase 64 KByte block
of memory array
Erase Full Memory Array
1101 1000b (D8H)
3
0
0
80 MHz
0110 0000b (60H)
or
1100 0111b (C7H)
To Program One Data Byte 0000 0010b (02H)
0
0
0
80 MHz
3
0
1
80 MHz
1010 1101b (ADH)
3
0
2 to
80 MHz
0000 0101b (05H)
0101b 0000b
(50H)
0000 0001b (01H)
0000 0110b (06H)
0000 0100b (04H)
0
0
0
0
1 to
0
80 MHz
80 MHz
0
0
0
0
0
0
1
0
0
80 MHz
80 MHz
80 MHz
1001 0000b (90H)
or
1010 1011b (ABH)
JEDEC ID read
1001 1111b (9FH)
Enable SO to output RY/BY# 0111 0000b (70H)
status during AAI programming
Disable SO as RY/BY#
1000 0000b (80H)
status during AAI programming
3
0
1 to
80 MHz
0
0
0
0
3 to
0
80 MHz
80 MHz
0
0
0
80 MHz
Chip-Erase
Byte-Program
AAI-Word-Pro- Auto Address Increment
gram6
Programming
RDSR7
Read-Status-Register
EWSR
WRSR
WREN
WRDI
RDID8
JEDEC-ID
EBSY
DBSY
Enable-Write-Status-Register
Write-Status-Register
Write-Enable
Write-Disable
Read-ID
T5.0 25044
1. One bus cycle is eight clock periods.
©2011 Silicon Storage Technology, Inc.
DS25044A
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16 Mbit SPI Serial Flash
SST25VF016B
A Microchip Technology Company
Data Sheet
2.
3.
4.
5.
6.
Address bits above the most significant bit of each density can be VIL or VIH.
4KByte Sector Erase addresses: use AMS-A12, remaining addresses are don’t care but must be set either at VIL or VIH.
32KByte Block Erase addresses: use AMS-A15, remaining addresses are don’t care but must be set either at VIL or VIH.
64KByte Block Erase addresses: use AMS-A16, remaining addresses are don’t care but must be set either at VIL or VIH.
To continue programming to the next sequential address location, enter the 8-bit command, ADH, followed by 2 bytes of
data to be programmed. Data Byte 0 will be programmed into the initial address [A23-A1] with A0=0, Data Byte 1 will be
programmed into the
initial address [A23-A1] with A0=1.
7. The Read-Status-Register is continuous with ongoing clock cycles until terminated by a low to high transition on CE#.
8. Manufacturer’s ID is read with A0=0, and Device ID is read with A0=1. All other address bits are 00H. The Manufacturer’s ID and device ID output stream is continuous until terminated by a low-to-high transition on CE#.
Read (25 MHz)
The Read instruction, 03H, supports up to 25 MHz Read. The device outputs the data starting from the
specified address location. The data output stream is continuous through all addresses until terminated by a low to high transition on CE#. The internal address pointer will automatically increment until
the highest memory address is reached. Once the highest memory address is reached, the address
pointer will automatically increment to the beginning (wrap-around) of the address space. Once the
data from address location 1FFFFFH has been read, the next output will be from address location
000000H.
The Read instruction is initiated by executing an 8-bit command, 03H, followed by address bits [A23A0]. CE# must remain active low for the duration of the Read cycle. See Figure 5 for the Read
sequence.
CE#
MODE 3
SCK
0 1 2 3 4 5 6 7 8
ADD.
ADD.
03
SI
MSB
MSB
SO
15 16
23 24
31 32
39 40
47
48
55 56
63 64
70
MODE 0
HIGH IMPEDANCE
ADD.
N
DOUT
N+1
DOUT
N+2
DOUT
N+3
DOUT
N+4
DOUT
MSB
1271 ReadSeq.0
Figure 5: Read Sequence
©2011 Silicon Storage Technology, Inc.
DS25044A
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08/11
16 Mbit SPI Serial Flash
SST25VF016B
A Microchip Technology Company
Data Sheet
High-Speed-Read (80 MHz)
The High-Speed-Read instruction supporting up to 80 MHz Read is initiated by executing an 8-bit command, 0BH, followed by address bits [A23-A0] and a dummy byte. CE# must remain active low for the
duration of the High-Speed-Read cycle. See Figure 6 for the High-Speed-Read sequence.
Following a dummy cycle, the High-Speed-Read instruction outputs the data starting from the specified address location. The data output stream is continuous through all addresses until terminated by a
low to high transition on CE#. The internal address pointer will automatically increment until the highest memory address is reached. Once the highest memory address is reached, the address pointer
will automatically increment to the beginning (wrap-around) of the address space. Once the data from
address location 1FFFFFH has been read, the next output will be from address location 000000H.
CE#
MODE 3
0 1 2 3 4 5 6 7 8
15 16
23 24
31 32
39 40
47 48
55 56
63 64
71 72
80
SCK MODE 0
0B
SI
ADD.
ADD.
MSB
MSB
ADD.
X
N
DOUT
HIGH IMPEDANCE
SO
N+1
DOUT
N+2
DOUT
MSB
Note: X = Dummy Byte: 8 Clocks Input Dummy Cycle (VIL or VIH)
N+3
DOUT
N+4
DOUT
1271 HSRdSeq.0
Figure 6: High-Speed-Read Sequence
Byte-Program
The Byte-Program instruction programs the bits in the selected byte to the desired data. The selected
byte must be in the erased state (FFH) when initiating a Program operation. A Byte-Program instruction
applied to a protected memory area will be ignored.
Prior to any Write operation, the Write-Enable (WREN) instruction must be executed. CE# must remain
active low for the duration of the Byte-Program instruction. The Byte-Program instruction is initiated by
executing an 8-bit command, 02H, followed by address bits [A23-A0]. Following the address, the data is
input in order from MSB (bit 7) to LSB (bit 0). CE# must be driven high before the instruction is executed. The user may poll the Busy bit in the software status register or wait TBP for the completion of
the internal self-timed Byte-Program operation. See Figure 7 for the Byte-Program sequence.
CE#
MODE 3
SCK
0 1 2 3 4 5 6 7 8
15 16
23 24
31 32
39
MODE 0
ADD.
02
SI
ADD.
MSB
MSB
ADD.
DIN
MSB
LSB
HIGH IMPEDANCE
SO
1271 ByteProg.0
Figure 7: Byte-Program Sequence
©2011 Silicon Storage Technology, Inc.
DS25044A
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08/11
16 Mbit SPI Serial Flash
SST25VF016B
A Microchip Technology Company
Data Sheet
Auto Address Increment (AAI) Word-Program
The AAI program instruction allows multiple bytes of data to be programmed without re-issuing the
next sequential address location. This feature decreases total programming time when multiple bytes
or entire memory array is to be programmed. An AAI Word program instruction pointing to a protected
memory area will be ignored. The selected address range must be in the erased state (FFH) when initiating an AAI Word Program operation. While within AAI Word Programming sequence, only the following instructions are valid: for software end-of-write detection—AAI Word (ADH), WRDI (04H), and
RDSR (05H); for hardware end-of-write detection—AAI Word (ADH) and WRDI (04H). There are three
options to determine the completion of each AAI Word program cycle: hardware detection by reading
the Serial Output, software detection by polling the BUSY bit in the software status register, or wait TBP.
Refer to“End-of-Write Detection” for details.
Prior to any write operation, the Write-Enable (WREN) instruction must be executed. Initiate the AAI
Word Program instruction by executing an 8-bit command, ADH, followed by address bits [A23-A0]. Following the addresses, two bytes of data are input sequentially, each one from MSB (Bit 7) to LSB (Bit
0). The first byte of data (D0) is programmed into the initial address [A23-A1] with A0=0, the second
byte of Data (D1) is programmed into the initial address [A23-A1] with A0=1. CE# must be driven high
before executing the AAI Word Program instruction. Check the BUSY status before entering the next
valid command. Once the device indicates it is no longer busy, data for the next two sequential
addresses may be programmed, followed by the next two, and so on.
When programming the last desired word, or the highest unprotected memory address, check the busy
status using either the hardware or software (RDSR instruction) method to check for program completion. Once programming is complete, use the applicable method to terminate AAI. If the device is in
Software End-of-Write Detection mode, execute the Write-Disable (WRDI) instruction, 04H. If the
device is in AAI Hardware End-of-Write Detection mode, execute the Write-Disable (WRDI) instruction,
04H, followed by the 8-bit DBSY command, 80H. There is no wrap mode during AAI programming
once the highest unprotected memory address is reached. See Figures 10 and 11 for the AAI Word
programming sequence.
End-of-Write Detection
There are three methods to determine completion of a program cycle during AAI Word programming:
hardware detection by reading the Serial Output, software detection by polling the BUSY bit in the Software Status Register, or wait TBP. The Hardware End-of-Write detection method is described in the
section below.
Hardware End-of-Write Detection
The Hardware End-of-Write detection method eliminates the overhead of polling the Busy bit in the
Software Status Register during an AAI Word program operation. The 8-bit command, 70H, configures
the Serial Output (SO) pin to indicate Flash Busy status during AAI Word programming. (see Figure 8)
The 8-bit command, 70H, must be executed prior to initiating an AAI Word-Program instruction. Once
an internal programming operation begins, asserting CE# will immediately drive the status of the internal flash status on the SO pin. A ‘0’ indicates the device is busy and a ‘1’ indicates the device is ready
for the next instruction. De-asserting CE# will return the SO pin to tri-state. While in AAI and Hardware
End-of-Write detection mode, the only valid instructions are AAI Word (ADH) and WRDI (04H).
To exit AAI Hardware End-of-Write detection, first execute WRDI instruction, 04H, to reset the WriteEnable-Latch bit (WEL=0) and AAI bit. Then execute the 8-bit DBSY command, 80H, to disable RY/
BY# status during the AAI command. See Figures 9 and 10.
©2011 Silicon Storage Technology, Inc.
DS25044A
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08/11
16 Mbit SPI Serial Flash
SST25VF016B
A Microchip Technology Company
Data Sheet
CE#
MODE 3
SCK
0 1 2 3 4 5 6 7
MODE 0
70
SI
MSB
HIGH IMPEDANCE
SO
1271 EnableSO.0
Figure 8: Enable SO as Hardware RY/BY# During AAI Programming
CE#
MODE 3
SCK
0 1 2 3 4 5 6 7
MODE 0
80
SI
MSB
HIGH IMPEDANCE
SO
1271 DisableSO.0
Figure 9: Disable SO as Hardware RY/BY# During AAI Programming
©2011 Silicon Storage Technology, Inc.
DS25044A
13
08/11
16 Mbit SPI Serial Flash
SST25VF016B
A Microchip Technology Company
Data Sheet
CE#
MODE 3
0
0
7
0
7
7 8
15 16 23 24
31 32
39 40 47
0
7 8
15 16 23
SCK MODE 0
SI
AD
WREN
EBSY
A
A
A
D0
D1
AD
D2
D3
Load AAI command, Address, 2 bytes data
SO
Check for Flash Busy Status to load next valid1 command
CE# cont.
0
7 8
15 16 23
0
7
0
7
0
7 8
15
SCK cont.
Dn-1
AD
SI cont.
WRDI
Dn
Last 2
Data Bytes
RDSR
DBSY
WRDI followed by DBSY
to exit AAI Mode
DOUT
SO cont.
Check for Flash Busy Status to load next valid1 command
Note:
1. Valid commands during AAI programming: AAI command or WRDI command
2. User must configure the SO pin to output Flash Busy status during AAI programming
1271 AAI.HW.3
Figure 10:Auto Address Increment (AAI) Word-Program Sequence with
Hardware End-of-Write Detection
Wait TBP or poll Software Status
register to load next valid1 command
CE#
MODE 3
0
7 8
15 16 23 24
31 32 39 40 47
0
7 8
15 16 23
0
7 8
15 16 23
0
7
0
7 8
15
SCK MODE 0
SI
AD
A
A
A
D0
D1
AD
D2
D3
AD
Dn-1
Dn
Last 2
Data Bytes
Load AAI command, Address, 2 bytes data
WRDI
RDSR
WRDI to exit
AAI Mode
SO
Note:
DOUT
1. Valid commands during AAI programming: AAI command, RDSR command, or WRDI command
1271 AAI.SW.1
Figure 11:Auto Address Increment (AAI) Word-Program Sequence with
Software End-of-Write Detection
©2011 Silicon Storage Technology, Inc.
DS25044A
14
08/11
16 Mbit SPI Serial Flash
SST25VF016B
A Microchip Technology Company
Data Sheet
4-KByte Sector-Erase
The Sector-Erase instruction clears all bits in the selected 4 KByte sector to FFH. A Sector-Erase
instruction applied to a protected memory area will be ignored. Prior to any Write operation, the WriteEnable (WREN) instruction must be executed. CE# must remain active low for the duration of any command sequence. The Sector-Erase instruction is initiated by executing an 8-bit command, 20H, followed by address bits [A23-A0]. Address bits [AMS-A12] (AMS = Most Significant address) are used to
determine the sector address (SAX), remaining address bits can be VIL or VIH. CE# must be driven high
before the instruction is executed. The user may poll the Busy bit in the software status register or wait
TSE for the completion of the internal self-timed Sector-Erase cycle. See Figure 12 for the SectorErase sequence.
CE#
MODE 3
SCK
0 1 2 3 4 5 6 7 8
15 16
23 24
31
MODE 0
20
SI
MSB
ADD.
ADD.
ADD.
MSB
HIGH IMPEDANCE
SO
1271 SecErase.0
Figure 12:Sector-Erase Sequence
©2011 Silicon Storage Technology, Inc.
DS25044A
15
08/11
16 Mbit SPI Serial Flash
SST25VF016B
A Microchip Technology Company
Data Sheet
32-KByte and 64-KByte Block-Erase
The 32-KByte Block-Erase instruction clears all bits in the selected 32 KByte block to FFH. A BlockErase instruction applied to a protected memory area will be ignored. The 64-KByte Block-Erase instruction clears all bits in the selected 64 KByte block to FFH. A Block-Erase instruction applied to a protected memory area will be ignored. Prior to any Write operation, the Write-Enable (WREN) instruction must be executed.
CE# must remain active low for the duration of any command sequence. The 32-Kbyte Block-Erase
instruction is initiated by executing an 8-bit command, 52H, followed by address bits [A23-A0]. Address
bits [AMS-A15] (AMS = Most Significant Address) are used to determine block address (BAX), remaining
address bits can be VIL or VIH. CE# must be driven high before the instruction is executed. The 64-Kbyte BlockErase instruction is initiated by executing an 8-bit command D8H, followed by address bits [A23-A0]. Address bits
[AMS-A15] are used to determine block address (BAX), remaining address bits can be VIL or VIH. CE# must be
driven high before the instruction is executed. The user may poll the Busy bit in the software status register or
wait TBE for the completion of the internal self-timed 32-KByte Block-Erase or 64-KByte Block-Erase
cycles. See Figures 13 and 14 for the 32-KByte Block-Erase and 64-KByte Block-Erase sequences.
CE#
MODE 3
SCK
0 1 2 3 4 5 6 7 8
23 24
15 16
31
MODE 0
ADDR
ADDR
52
SI
MSB
ADDR
MSB
HIGH IMPEDANCE
SO
1271 32KBklEr.0
Figure 13:32-KByte Block-Erase Sequence
CE#
MODE 3
SCK
0 1 2 3 4 5 6 7 8
15 16
23 24
31
MODE 0
ADDR
D8
SI
MSB
ADDR
ADDR
MSB
HIGH IMPEDANCE
SO
1271 63KBlkEr.0
Figure 14:64-KByte Block-Erase Sequence
©2011 Silicon Storage Technology, Inc.
DS25044A
16
08/11
16 Mbit SPI Serial Flash
SST25VF016B
A Microchip Technology Company
Data Sheet
Chip-Erase
The Chip-Erase instruction clears all bits in the device to FFH. A Chip-Erase instruction will be ignored
if any of the memory area is protected. Prior to any Write operation, the Write-Enable (WREN) instruction
must be executed. CE# must remain active low for the duration of the Chip-Erase instruction sequence.
The Chip-Erase instruction is initiated by executing an 8-bit command, 60H or C7H. CE# must be driven
high before the instruction is executed. The user may poll the Busy bit in the software status register or wait
TCE for the completion of the internal self-timed Chip-Erase cycle. See Figure 15 for the Chip-Erase
sequence.
CE#
MODE 3
SCK
0 1 2 3 4 5 6 7
MODE 0
60 or C7
SI
MSB
HIGH IMPEDANCE
SO
1271 ChEr.0
Figure 15:Chip-Erase Sequence
Read-Status-Register (RDSR)
The Read-Status-Register (RDSR) instruction allows reading of the status register. The status register
may be read at any time even during a Write (Program/Erase) operation. When a Write operation is in
progress, the Busy bit may be checked before sending any new commands to assure that the new
commands are properly received by the device. CE# must be driven low before the RDSR instruction is
entered and remain low until the status data is read. Read-Status-Register is continuous with ongoing
clock cycles until it is terminated by a low to high transition of the CE#. See Figure 16 for the RDSR
instruction sequence.
CE#
MODE 3
SCK
SI
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
MODE 0
05
MSB
HIGH IMPEDANCE
SO
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
MSB
Status
Register Out
1271 RDSRseq.0
Figure 16:Read-Status-Register (RDSR) Sequence
©2011 Silicon Storage Technology, Inc.
DS25044A
17
08/11
16 Mbit SPI Serial Flash
SST25VF016B
A Microchip Technology Company
Data Sheet
Write-Enable (WREN)
The Write-Enable (WREN) instruction sets the Write-Enable-Latch bit in the Status Register to 1 allowing Write operations to occur. The WREN instruction must be executed prior to any Write (Program/
Erase) operation. The WREN instruction may also be used to allow execution of the Write-Status-Register (WRSR) instruction; however, the Write-Enable-Latch bit in the Status Register will be cleared
upon the rising edge CE# of the WRSR instruction. CE# must be driven high before the WREN instruction is executed.
CE#
MODE 3
SCK
0 1 2 3 4 5 6 7
MODE 0
06
SI
MSB
HIGH IMPEDANCE
SO
1271 WREN.0
Figure 17:Write Enable (WREN) Sequence
Write-Disable (WRDI)
The Write-Disable (WRDI) instruction resets the Write-Enable-Latch bit and AAI bit to 0 disabling any
new Write operations from occurring. The WRDI instruction will not terminate any programming operation in progress. Any program operation in progress may continue up to TBP after executing the WRDI
instruction. CE# must be driven high before the WRDI instruction is executed.
CE#
MODE 3
SCK
0 1 2 3 4 5 6 7
MODE 0
04
SI
MSB
HIGH IMPEDANCE
SO
1271 WRDI.0
Figure 18:Write Disable (WRDI) Sequence
©2011 Silicon Storage Technology, Inc.
DS25044A
18
08/11
16 Mbit SPI Serial Flash
SST25VF016B
A Microchip Technology Company
Data Sheet
Enable-Write-Status-Register (EWSR)
The Enable-Write-Status-Register (EWSR) instruction arms the Write-Status-Register (WRSR)
instruction and opens the status register for alteration. The Write-Status-Register instruction must be
executed immediately after the execution of the Enable-Write-Status-Register instruction. This twostep instruction sequence of the EWSR instruction followed by the WRSR instruction works like SDP
(software data protection) command structure which prevents any accidental alteration of the status
register values. CE# must be driven low before the EWSR instruction is entered and must be driven
high before the EWSR instruction is executed.
Write-Status-Register (WRSR)
The Write-Status-Register instruction writes new values to the BP3, BP2, BP1, BP0, and BPL bits of
the status register. CE# must be driven low before the command sequence of the WRSR instruction is
entered and driven high before the WRSR instruction is executed. See Figure 19 for EWSR or WREN
and WRSR instruction sequences.
Executing the Write-Status-Register instruction will be ignored when WP# is low and BPL bit is set to
“1”. When the WP# is low, the BPL bit can only be set from “0” to “1” to lock-down the status register,
but cannot be reset from “1” to “0”. When WP# is high, the lock-down function of the BPL bit is disabled
and the BPL, BP0, and BP1 and BP2 bits in the status register can all be changed. As long as BPL bit
is set to 0 or WP# pin is driven high (VIH) prior to the low-to-high transition of the CE# pin at the end of
the WRSR instruction, the bits in the status register can all be altered by the WRSR instruction. In this
case, a single WRSR instruction can set the BPL bit to “1” to lock down the status register as well as
altering the BP0, BP1, and BP2 bits at the same time. See Table 2 for a summary description of WP#
and BPL functions.
CE#
MODE 3
SCK
0 1 2 3 4 5 6 7
MODE 3
MODE 0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
MODE 0
01
50 or 06
SI
MSB
MSB
STATUS
REGISTER IN
7 6 5 4 3 2 1 0
MSB
HIGH IMPEDANCE
SO
1271 EWSR.0
Figure 19:Enable-Write-Status-Register (EWSR) or
Write-Enable (WREN) and Write-Status-Register (WRSR) Sequence
©2011 Silicon Storage Technology, Inc.
DS25044A
19
08/11
16 Mbit SPI Serial Flash
SST25VF016B
A Microchip Technology Company
Data Sheet
JEDEC Read-ID
The JEDEC Read-ID instruction identifies the device as SST25VF016B and the manufacturer as SST.
The device information can be read from executing the 8-bit command, 9FH. Following the JEDEC
Read-ID instruction, the 8-bit manufacturer’s ID, BFH, is output from the device. After that, a 16-bit
device ID is shifted out on the SO pin. Byte 1, BFH, identifies the manufacturer as SST. Byte 2, 25H,
identifies the memory type as SPI Serial Flash. Byte 3, 41H, identifies the device as SST25VF016B.
The instruction sequence is shown in Figure 20. The JEDEC Read ID instruction is terminated by a low
to high transition on CE# at any time during data output. If no other command is issued after executing
the JEDEC Read-ID instruction, issue a 00H (NOP) command before going into Standby Mode
(CE#=VIH).
CE#
MODE 3
SCK
0 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
MODE 0
9F
SI
SO
HIGH IMPEDANCE
BF
25
MSB
41
MSB
1271 JEDECID.1
Figure 20:JEDEC Read-ID Sequence
Table 6: JEDEC Read-ID Data
Device ID
Manufacturer’s ID
Memory Type
Memory Capacity
Byte1
Byte 2
Byte 3
BFH
25H
41H
T6.0 25044
©2011 Silicon Storage Technology, Inc.
DS25044A
20
08/11
16 Mbit SPI Serial Flash
SST25VF016B
A Microchip Technology Company
Data Sheet
Read-ID (RDID)
The Read-ID instruction (RDID) identifies the devices as SST25VF016B and manufacturer as SST.
This command is backward compatible to all SST25xFxxxA devices and should be used as default
device identification when multiple versions of SPI Serial Flash devices are used in a design. The
device information can be read from executing an 8-bit command, 90H or ABH, followed by address
bits [A23-A0]. Following the Read-ID instruction, the manufacturer’s ID is located in address 00000H
and the device ID is located in address 00001H. Once the device is in Read-ID mode, the manufacturer’s and device ID output data toggles between address 00000H and 00001H until terminated by a
low to high transition on CE#.
Refer to Tables 6 and 7 for device identification data.
CE#
MODE 3
SCK
0 1 2 3 4 5 6 7 8
23 24
15 16
31 32
39 40
47 48
55 56
63
MODE 0
90 or AB
SI
00
00
MSB
ADD1
MSB
HIGH IMPEDANCE
SO
BF
Device ID
BF
Device ID
HIGH
IMPEDANCE
MSB
Note: The manufacturer s and device ID output stream is continuous until terminated by a low to high transition on CE#.
Device ID = 41H for SST25VF016B
1. 00H will output the manfacturer s ID first and 01H will output device ID first before toggling between the two.
1271 RdID.0
Figure 21:Read-ID Sequence
Table 7: Product Identification
Manufacturer’s ID
Address
Data
00000H
BFH
00001H
41H
Device ID
SST25VF016B
T7.0 25044
©2011 Silicon Storage Technology, Inc.
DS25044A
21
08/11
16 Mbit SPI Serial Flash
SST25VF016B
A Microchip Technology Company
Data Sheet
Electrical Specifications
Absolute Maximum Stress Ratings (Applied conditions greater than those listed under “Absolute
Maximum Stress Ratings” may cause permanent damage to the device. This is a stress rating only and
functional operation of the device at these conditions or conditions greater than those defined in the
operational sections of this data sheet is not implied. Exposure to absolute maximum stress rating conditions may affect device reliability.)
Temperature Under Bias . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55°C to +125°C
Storage Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65°C to +150°C
D. C. Voltage on Any Pin to Ground Potential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to VDD+0.5V
Transient Voltage (
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