BCM88335 Data Sheet
WLAN Host Interfaces
Section 9: WLAN Host Interfaces
SDIO v3.0
The BCM88335 WLAN section supports SDIO version 3.0, including the new UHS-I modes:
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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).
Note: The BCM88335 is backward compatible with SDIO v2.0 host interfaces.
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 16 WLAN
GPIO Functions and Strapping Options.
The following three functions are supported:
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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)
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Function 2 WLAN Function for efficient WLAN packet transfer through DMA
(Max. BlockSize/ByteCount = 512B)
SDIO Pins
Table 12: SDIO Pin Description
SD 4-Bit Mode
Data line 0
SD 1-Bit Mode
gSPI Mode
Data output
DATA0
DATA1
DATA2
DATA3
CLK
DATA Data line
DO
IRQ
NC
CS
Data line 1 or Interrupt IRQ
Data line 2 or Read Wait RW
Interrupt
Read Wait
Not used
Clock
Interrupt
Not used
Card select
Data line 3
Clock
N/C
CLK
SCLK Clock
DI Data input
CMD
Command line
CMD Command line
Broadcom®
September 23, 2015 • 88335-DS100-R
Page 56
BROADCOM CONFIDENTIAL
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