PRELIMINARY
CYW43438
Status
The gSPI interface supports status notification to the host after a read/write transaction. This status notification provides information
about packet errors, protocol errors, available packets in the RX queue, etc. The status information helps reduce the number of
interrupts to the host. The status-reporting feature can be switched off using a register bit, without any timing overhead. The gSPI bus
timing for read/write transactions with and without status notification are as shown in Figure 13 below and Figure 14. See Table 6 for
information on status-field details.
Figure 13. gSPI Signal Timing Without Status
Write
CS
SCLK
MOSI
CC3311 CC3300
CC11 CC00 DD3311 DD3300
DD11 DD00
Command 32 bits Write Data 16*n bits
CS
Write-Read
SCLK
MOSI
MISO
CC3311 CC3300
CC00
CC00
DD3311 DD3300
DD00
DD11
Response
Delay
Command
32 bits
Read Data 16*n bits
Read
CS
SCLK
MOSI
MISO
CC3311 CC3300
DD3311 DD3300
DD00
Command
32 bits
Response
Delay
Read Data
16*n bits
Document Number: 002-14796 Rev. *K
Page 20 of 101
CYPRESS [ CYPRESS ]
