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NX25F011B View Datasheet(PDF) - Unspecified

Part NameDescriptionManufacturer
NX25F011B 1M-BIT, 2M-BIT, AND 4M-BIT SERIAL FLASH MEMORIES WITH 4-PIN SPI INTERFACE ETC1
Unspecified 
NX25F011B Datasheet PDF : 37 Pages
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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) can reduce power consumption during read
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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