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Document Number: 002-14949 Rev. *G
Page 46 of 113
PRELIMINARY
CYW43353
Figure 24. gSPI Signal Timing with Status (Response Delay = 0; 32-bit Big Endian)
Table 13. gSPI Status Field Details
Bit
Name
Description
0
Data not available
The requested read data is not available
1
Underflow
FIFO underflow occurred due to current (F2, F3) read command
2
Overflow
FIFO overflow occurred due to current (F1, F2, F3) write command
3
F2 interrupt
F2 channel interrupt
4
F3 interrupt
F3 channel interrupt
5
F2 RX Ready
F2 FIFO is ready to receive data (FIFO empty)
6
F3 RX Ready
F3 FIFO is ready to receive data (FIFO empty)
7
Reserved
–
8
F2 Packet Available
Packet is available/ready in F2 TX FIFO
9:19
F2 Packet Length
Length of packet available in F2 FIFO
20
F3 Packet Available
Packet is available/ready in F3 TX FIFO
21:31
F3 Packet Length
Length of packet available in F3 FIFO
C31
C0
D31
D1
D0
Read Data 16*n bits
miso
cs
sclk
mosi
S0
S31
Status 32 bits
C31
C0
D31
D1
D0
Command 32 bits
Read Data 16*n bits
miso
cs
sclk
mosi
S0
S31
Status 32 bits
C31
S0
C1
C0
D31
S31
D1
D0
Command 32 bits
Write Data 16*n bits
cs
sclk
mosi
S1
Status 32 bits
miso
C31
C0
D31
D1
D0
S0
S31
C31
C0
D31
D1
D0
S0
S31
C31
C0
D31
D1
D0
S0
S31
C31
C0
D31
D1
D0
S0
S31
C31
S0
C1
C0
D31
S31
D1
D0
S1
C31
S0
C1
C0
D31
S31
D1
D0
S1
Command 32 bits
Write
Write‐Read
Read