BCM4339 Preliminary Data Sheet
Generic SPI Mode
Generic SPI Mode
In addition to the full SDIO mode, the BCM4339 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 27: Signal Connections to SDIO Host (gSPI Mode)
SCLK
DI
DO
SD Host
BCM4339
IRQ
CS
Broadcom®
November 17, 2014 • 4339-DS106-R
Page 75
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