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PDF ( 数据手册 , 数据表 ) NX25F011B

零件编号 NX25F011B
描述 (NX25F011B - NX25F041B) SERIAL FLASH MEMORIES
制造商 NexFlash
LOGO NexFlash LOGO 


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NX25F011B 数据手册, 描述, 功能
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PRELIMINARY
DECEMBER 2001
NX25F011B, NX25F021B, NX25F041B
1M-BIT, 2M-BIT, AND 4M-BIT
SERIAL FLASH MEMORIES WITH 4-PIN SPI INTERFACE
This document contains PRELIMINARY INFORMATION. NexFlash reserves the right to make changes to its product at any time without notice in order to improve design and supply the best possible
product. We assume no responsibility for any errors which may appear in this publication. Copyright 2001, NexFlash Technologies, Inc.
NexFlash Technologies, Inc.
PRELIMINARY NXSF016F-1201
12/12/01 ©
1







NX25F011B pdf, 数据表
NX25F011B
NX25F021B
NX25F041B
Serial SRAM
One of the most powerful features of the NX25F011B,
NX25F021B, and NX25F041B is the integrated Serial
SRAM. The main purpose of the Serial SRAM is to serve
as the primary buffer for sector data to be written into the
Serial Flash memory array. Using the Write to Sector
command, data is first shifted into the SRAM from the SPI
bus. When the command sequence has been completed, the
entire 264-bytes is written to the selected sector. See
Erase/Write cycle timing (tWP).
The SRAM is fully byte-addressable. Thus, the entire
264-bytes, a single byte, or a sequence of bytes can be read
from, or written to the SRAM. This allows the SRAM to be
used as a temporary work area for read-modify-write
operations prior to a sector write.
The Transfer Sector to SRAM command allows the con-
tents of a specified sector of Flash memory to be moved to
the SRAM. This can be useful when only a portion of a sector
needs to be altered. In this case the sector is first transferred
to the SRAM, where modifications are made using the Write
to SRAM command. Once complete, a Transfer SRAM to
Sector command is used to update the sector.
The Compare Sector command allows the contents of the
SRAM to be compared with the specified sector in memory.
The result of the compare is set in the status register. This
command is useful for performing a fast verify of the last
sector write operation (see Write/ Verify Flow towards the
end of this data sheet). This command can be useful when
re-writing multi-sector files that have only minor changes
from the previous write. If the new data in the SRAM is the
same as the previously written data, the sector write can
be skipped. Used in this way, the command saves time
that would have been used for re-programming. It also
extends the endurance of the Flash memory cells.
READ FROM
DEVICE INFORMATION
SECTOR
READ FROM
SECTOR
SCK
CS
SI
SO
SPI
COMMAND
AND
CONTROL
LOGIC
CONFIGURATION
REGISTER
STATUS
REGISTER
COMPARE SECTOR
TO SRAM
DEVICE INFORMATION SECTOR
SERIAL FLASH MEMORY ARRAY
512, 1024 AND 2048 BYTE-ADDRESSABLE
SECTORS OF 264-BYTES EACH
TRANSFER
SECTOR TO
SRAM
READ FROM
OR WRITE TO
SRAM
WRITE TO SECTOR
(VIA SRAM)
SERIAL SRAM
Note:
1. A single byte, several bytes, or all bytes of a Flash sector, the SRAM, or Program Buffer may be addressed.
2. All double lines represent implied connections or actions.
Figure 5. Command Relationships of the SPI Interface, Serial Flash Memory Array and SRAM
8 NexFlash Technologies, Inc.
PRELIMINARY NXSF016F-1201
12/12/01 ©







NX25F011B equivalent, schematic
NX25F011B
NX25F021B
NX25F041B
SERIAL FLASH SECTOR COMMANDS
Read From Sector (52H)
Reading from a sector is accomplished by first bringing
CS low then shifting in the Read from Sector command
(52H) followed by its 16-bit sector-addressfield.
Although the sector-address field is 16-bits, only bits
S[8:0] for the NX25F011B (0-1FFH), S[9:0] for the
NX25F021B (0-3FFH), S[10:0] for the NX25F041B
(0-7FFH) are used. The uppermost sector address bits
are not used but must be clocked using 0 for data. Next
a 16-bit byte-addressfield is clocked into the device to
designate the starting location within the 264-byte
sector. Only B[8:0] of the byte-address field are used;
the uppermost bits are not used but must be clocked in
(use 0 for data). Only byte-addresses of 0 to 107H
(264 bytes) are valid. Following the byte-address field,
16 control clocks are required with data=0.
The Serial Data Output (SO) will change from a
high-impedance state and begin to drive the output with
Ready/Busy status RB[15:0]. If SO uses the rising edge
of clock (configuration register RCE=1), the output will
be driven after the last control clock. If SO uses the
falling edge of clock (RCE=0), the output will be driven
on the next falling edge of clock. If the array is not busy,
the output status will be 9999H, followed by the sector
data on the SO pin. If the array is busy, the status will be
6666H, and the command should be terminated and
restarted after a ready state occurs. The data field is
shifted out with the least significant byte first (i.e.,
byte-00H, byte-01H, ...). The bit order within each byte
is the most significant bit first (i.e.,D7,...D0). The
byte-address is internally incremented to the next higher
byte address as the clock continues. When the highest
byte-address (107H) is reached, the address counter
rolls over to byte-0H and continues to increment. Assert-
ing the CS pin high completes (or terminates) the
command. Detailed timing for the Read from Sector
command is shown in Figure 10.
Read From Sector with Auto Increment (50H)
The Read from sector with Auto Increment command
operates similar to the standard Read from Sector com-
mand except that after the last bit of the current sector is
clocked the next sequentially addressed sector will be
automatically selected for reading without requiring the nine
byte command sequence to be issued. This allows the
entire device or a large number of sectors to be read out with
a single command.
Read From Sector Low Frequency (51H) and
Read From Sector Low Frequency with Auto
Increment (5BH)
The Read From Sector at Low Frequency command (51H)
and Read From Sector Low Frequency with Auto Increment
command (5BH) canreducepowerconsumptionduringread
operations by 25%-40% when the system clock frequency
is 1 MHz or lower. The command sequences are identical to
the standard commands.
Read from
Sector
Command
Sector
Address*
Byte
Address** 16 Clocks
SI 52H, 50H, 51H, 53H S[15:0]
B[15:0]
0000H
SO
RB[15:0]
First Byte - Last Byte
Read/Busy
Status
Read Sector Data
*The sector address only uses bits [8:0], [9:0] or [10:0] Depending on the density
**The byte address only uses bits [8:0]. Byte address must be 0000h for Auto Increment commands
16 NexFlash Technologies, Inc.
PRELIMINARY NXSF016F-1201
12/12/01 ©










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