BCM4354 datasheet(71/192 Pages) CYPRESS

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HSIC Interface

BCM4354 Data Sheet

BROADCOM CONFIDENTIAL

Broadcom®

October 15, 2014 • 4354-DS109-R

Page 70

Figure 26: Signal Connections to SDIO Host (SD 4-Bit Mode)

Figure 27: Signal Connections to SDIO Host (SD 1-Bit Mode)

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.

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.

SD Host

CLK

CMD

DAT[3:0]

BCM4354

SD Host

CLK

CMD

DATA

IRQ

BCM4354

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