Document Number: 002-14826 Rev. *G
Page 56 of 65
PRELIMINARY
CYW43903
17.1.2 Write-Register Timing
shows the SPI flash extended and quad write-register timing.
Note:
Regarding
:
1. All write-register commands except Write Lock Register are supported.
2. The waveform must be extended for each protocol: to 23 for extended and five for quad.
3. A Write Nonvolatile Configuration Register operation requires data being sent starting from the least significant byte.
Figure 14. SPI Flash Write-Register Timing
0
7
8
9
10
11
12
13
14
15
MSB
Command
LSB
C
Extended
DQ0
D
IN
D
IN
D
IN
D
IN
D
IN
D
IN
D
IN
D
IN
D
IN
0
1
2
3
MSB
Command
LSB
C
Quad
DQ[3:0]
D
IN
D
IN
D
IN
MSB
LSB
LSB
MSB