BCM4330 Preliminary Data Sheet
Generic SPI Mode
Generic SPI Mode
In addition to the full SDIO mode, the BCM4330 includes the option of using the simplified generic SPI (gSPI)
interface/protocol. Characteristics of the gSPI mode include:
• 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 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], Table 19: “WLAN GPIO Functions
and Strapping Options,” on page 112.
SCLK
DI
DO
SD Host
BCM4330
IRQ
CS
Figure 26: Signal Connections to SDIO Host (gSPI Mode)
®
BROADCOM
BCM4330 Preliminary Data Sheet
April 28, 2011 • 4330-DS304-RI
Page 76
CYPRESS [ CYPRESS ]
