CYW4343X
4.2 Generic SPI Mode
In addition to the full SDIO mode, the CYW4343X includes the option of using the simplified generic SPI (gSPI) interface/protocol.
Characteristics of the gSPI mode include:
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Up to 50 MHz operation
Fixed delays for responses and data from the device
Alignment to host gSPI frames (16 or 32 bits)
Up to 2 KB frame size per transfer
Little-endian and big-endian configurations
A configurable active edge for shifting
Packet transfer through DMA for WLAN
gSPI mode is enabled using the strapping option pins. See Table 24 on page 86 for details.
Figure 19. Signal Connections to SDIO Host (gSPI Mode)
SCLK
DI
DO
CYW4343X
SD Host
IRQ
CS
4.3 SPI Protocol
The SPI protocol supports both 16-bit and 32-bit word operation. Byte endianess is supported in both modes. Figure 20 and
Figure 21 on page 27 show the basic write and write/read commands.
Document No. 002-14797 Rev. *H
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