Document Number: 002-14826 Rev. *G
Page 55 of 65
PRELIMINARY
CYW43903
17. SPI Flash Characteristics
17.1 SPI Flash Timing
17.1.1 Read-Register Timing
shows the SPI flash extended and quad read-register timing.
Note:
Regarding
: All Read Register commands except Read Lock Register are supported. A Read Nonvolatile Configuration Register operation will output data
starting from the least significant byte.
Figure 13. SPI Flash Read-Register Timing
0
7
8
9
10
11
12
13
14
15
MSB
Command
LSB
C
Extended
DQ0
DQ1
High-Z
D
OUT
D
OUT
D
OUT
D
OUT
D
OUT
D
OUT
D
OUT
D
OUT
D
OUT
0
1
2
3
MSB
Command
LSB
C
Quad
DQ[3:0]
D
OUT
D
OUT
D
OUT
MSB
LSB
LSB
MSB
Don’t care