BCM4319 Preliminary Data Sheet
gSPI
gSPI
The BCM4319 also includes the generic SPI (gSPI) interface/protocol functionality. Characteristics of the
BCM4319 interface includes support for:
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Up to 48 MHz operation
Fixed delays for responses and data from device
Alignment to host SPI frames (16- or 32-bits)
Up to 2 KB frame size per transfer
Little endian and big endian configurations
Configurable active edge for shifting
Packet transfer through DMA for WLAN
Figure 8: Host Interface
Host
WLAN
SPI_CLK/SDIO_CLK
SPI_DIN/SDIO_CMD
SPI_DOUT/SDIO_DATA_0
SPI_CSX/SDIO_DATA_3
WLAN_IRQ (SDIO_DATA_1 or GPIO_0)
CLK_REQ/XTAL_PU
REF_CLK/XTALIN
WLAN_ENABLE/WL_REG_ON
SPI Protocol
The SPI protocol supports both 16-bit and 32-bit word operation. Byte endianess is supported in both modes.
Figure 9 and Figure 10 show the basic write and write-read commands.
Broadcom®
Single-Chip IEEE 802.11™ a/b/g/n MAC/Baseband/Radio
Page 28
April 2, 2014 • 4319-DS05-R
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