MR20H40VDCR Просмотр технического описания (PDF) - Extech Instruments Corporation.
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MR20H40VDCR Datasheet PDF : 28 Pages
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MR20H40 / MR25H40
Read Data Bytes (READ)
The Read Data Bytes (READ) command allows data bytes to be read starting at an address specified by the
24-bit address. Only address bits 0-18 are decoded by the memory. The data bytes are read out sequentially
from memory until the read operation is terminated by bringing CS high. The entire memory can be read in
a single command. The address counter will roll over to 0000H when the address reaches the top of memo-
ry.
The READ command is entered by driving CS low and sending the command code. The memory drives the
read data bytes on the SO pin. Reads continue as long as the memory is clocked. The command is termi-
nated by bringing CS high.
Figure 8 – Read Data Bytes (READ) Timing
CS
SCK
0 1 2 3 4 5 6 7 8 9 10
28 29 30 31 32 33 34 35 36 37 38 39
Instruction (03h)
24-Bit Address
SI
0 0 0 0 0 0 1 1 23 22 21
3210
MSB
Data Out 1
Data Out 2
High Impedance
SO
765432107
MSB
Write Data Bytes (WRITE)
The Write Data Bytes (WRITE) command allows data bytes to be written starting at an address specified by
the 24-bit address. Only address bits 0-18 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 memory can
be executed without write delay. MRAM is a random access memory rather than a page, sector, or block
organized memory so it is 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.
Copyright © Everspin Technologies 2014
11
MR20H40 / MR25H40 Revision 11, 8/2014
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