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MR25H256
SPI COMMUNICATIONS PROTOCOL
Write Data Bytes (WRITE)
The Write Data Bytes (WRITE) command allows data bytes to be written starting at an address specified by
the 16-bit address. Only address bits 0-14 are decoded by the memory. The data bytes are written sequen-
tially in memory until the write operation is terminated by bringing CS high. The entire memory can be
written in a single command. The address counter will roll over to 0000h when the address reaches the top
of memory.
Unlike EEPROM or Flash Memory, MRAM can write data bytes continuously at its maximum rated clock
speed without write delays or data polling. Back to back WRITE commands to any random location in mem-
ory can be executed without write delay. MRAM is a random access memory rather than a page, sector, or
block organized memory making it ideal for both program and data storage.
The WRITE command is entered by driving CS low, sending the command code, and then sequential write
data bytes. Writes continue as long as the memory is clocked. The command is terminated by bringing CS
high.
Figure 2.6 WRITE
CS
0
1
2
3
4
5
6
7
8
9
10
20
21
22
23
24
25
26
27
28
29
30
31
SCK
Instruction (02h)
16-Bit Address
SI
0
0
0
0
0
0
1
0
X
14
13
3
2
1
0
7
6
5
4
3
2
1
0
MSB
MSB
SO
CS
High Impedance
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
Mode 3
SCK
Mode 0
Data Byte 2
Data Byte 3
Data Byte N
SI
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
SO
MSB
High Impedance
MSB
Copyright ? Everspin Technologies 2013
8
MR25H256 Rev. 9, 4/2013
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