BCM4354 Data Sheet
HSIC Interface
Figure 26: Signal Connections to SDIO Host (SD 4-Bit Mode)
CLK
BCM4354
CMD
SD Host
DAT[3:0]
Figure 27: Signal Connections to SDIO Host (SD 1-Bit Mode)
CLK
CMD
BCM4354
DATA
IRQ
SD Host
RW
Note: Per Section 6 of the SDIO specification, pull-ups in the 10 kΩ to 100 kΩ range are required on
the four DATA lines and the CMD line. This requirement must be met during all operating states either
through the use of external pull-up resistors or through proper programming of the SDIO host’s internal
pull-ups.
HSIC Interface
As an alternative to SDIO, an HSIC host interface can be enabled using the strapping option pins
strap_host_ifc_[3:1]. HSIC is a simplified derivative of the USB2.0 interface designed to replace a standard USB
PHY and cable for short distances (up to 10 cm) on board point-to-point connections. Using two signals, a
bidirectional data strobe (STROBE) and a bidirectional DDR data signal (DATA), it provides high-speed serial
480 Mbps data transfers that are 100% host driver compatible with traditional USB 2.0 cable-connected
topologies.
Broadcom®
October 15, 2014 • 4354-DS109-R
Page 70
BROADCOM CONFIDENTIAL
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