BCM88335 Data Sheet
Generic SPI Mode
Generic SPI Mode
In addition to the full SDIO mode, the BCM88335 includes the option of using the simplified generic SPI (gSPI)
interface/protocol. Characteristics of the gSPI mode include:
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Supports up to 48 MHz operation
Supports fixed delays for responses and data from device
Supports alignment to host gSPI frames (16 or 32 bits)
Supports up to 2 KB frame size per transfer
Supports little endian (default) and big endian configurations
Supports configurable active edge for shifting
Supports packet transfer through DMA for WLAN
gSPI mode is enabled using the strapping option pins strap_host_ifc_[3:1].
Figure 20: Signal Connections to SDIO Host (gSPI Mode)
SCLK
DI
DO
BCM88335
SD Host
IRQ
CS
Broadcom®
September 23, 2015 • 88335-DS100-R
Page 58
BROADCOM CONFIDENTIAL
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