NX25F011A
NX25F041A
SERIAL SRAM AND PROGRAM BUFFER
COMMANDS
Write to SRAM Command
The Write to SRAM command (82H) provides access to
the 264-Byte SRAM independently of any Flash memory
array operation. The command is similar to the Write to
Sector command sequence except that the sector
address field S[15:0] is replaced by all 0 bits. When CS
is asserted high to complete the command, the contents
Write to
SRAM
Command
16 Clocks
Byte
Address*
SI
82H
0000H
B[15:0]
SO
*The byte address only uses bits [8:0]
1
of the SRAM will be maintained until overwritten via
another command or the power is removed. Using the
2 Write to SRAM command, data can be loaded in prepara-
tion of writing to a sector in memory and then transferred
to a selected sector using the Transfer SRAM to Sector
command.
3
Write Sector Data
8 Clocks
First Byte - Last Byte
00H
4
5
6
Read from SRAM
The Read from SRAM command (81H) provides access
to the 264-Byte SRAM independent of any Flash memory
array operations. The command is similar to the Read
Read from
SRAM
Command
16 Clocks
Byte
Address*
16 Clocks
SI
81H
0000H
B[15:0]
0000H
SO
*The byte address only uses bits [8:0]
7 from Sector command except for the sector address field
S[15:0] which is replaced with all 0 bits.
8
9
RB[15:0]
First Byte - Last Byte
Read/Busy
Read SRAM Data
Status
10
11
12
NexFlash Technologies, Inc.
15
PRELIMINARY NXSF014B-0699
06/11/99