6.7.6
SPI User Defined Register
The SPI User Defined register can be used by the host to write custom commands to the
device(s) attached to the serial to parallel interface. Please refer to the specifications for
the attached devices for a list of predefined commands.
Type:
Offset
Read only
x‘08D0’
Reserved
SPI_USER_CMD[7:0]
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Field Name
Description
Bits
Reset
Reserved
31:8
0
Reserved
SPI_USER_CMD
[7:0]
SPI User Defined Command.
This field can be used by the host to write any valid
command defined by the device attached to the SPI
interface.
For example, if a Spansion S25FL128P device is
attached to the SPI interface, the user may issue a
deep power down mode command (B9h). The host
would write ‘B9h’ to this field, and then set
SPI_CMD to ‘100’ in the SPI Command Address
Register. The 820x will then write the power down
mode command to the flash device.
7:0
0
820x – Data Sheet, DS-0157-D
Page195
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