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WLAN Host Interfaces

BCM4354 Data Sheet

BROADCOM CONFIDENTIAL

Broadcom®

October 15, 2014 • 4354-DS109-R

Page 69

Section 10: WLAN Host Interfaces

SDIO v3.0

All three package options of the BCM4354 WLAN section provide support for SDIO version 3.0, including the

new UHS-I modes:

• DS: Default speed (DS) up to 25 MHz, including 1- and 4-bit modes (3.3V signaling).

• HS: High-speed up to 50 MHz (3.3V signaling).

• SDR12: SDR up to 25 MHz (1.8V signaling).

• SDR25: SDR up to 50 MHz (1.8V signaling).

• SDR50: SDR up to 100 MHz (1.8V signaling).

• SDR104: SDR up to 208 MHz (1.8V signaling)

• DDR50: DDR up to 50 MHz (1.8V signaling).

The SDIO interface also has the ability to map the interrupt signal on to a GPIO pin for applications requiring an

interrupt different from the one provided by the SDIO interface. The ability to force control of the gated clocks

from within the device is also provided. SDIO mode is enabled by strapping options. Refer to Table 23 on

page 119 WLAN GPIO Functions and Strapping Options.

The following three functions are supported:

• Function 0 Standard SDIO function (max. BlockSize/ByteCount = 32B)

• Function 1 Backplane Function to access the internal system-on-chip (SoC) address space

(max. BlockSize/ByteCount = 64B)

• Function 2 WLAN Function for efficient WLAN packet transfer through DMA

(max. BlockSize/ByteCount = 512B)

SDIO Pins

Note: The BCM4354 is backward compatible with SDIO v2.0 host interfaces.

Table 17: SDIO Pin Descriptions

SD 4-Bit Mode

SD 1-Bit Mode

DATA0

Data line 0

DATA

Data line

DATA1

Data line 1 or Interrupt IRQ

Interrupt

DATA2

Data line 2 or Read Wait RW

Read Wait

DATA3

Data line 3

N/C

Not used

CLK

Clock

CLK

Clock

CMD

Command line

CMD

Command line

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