BCM43455 Preliminary Data Sheet
WLAN Host Interfaces
Section 10: WLAN Host Interfaces
SDIO v3.0
All three package options of the BCM43455 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).
Note: The BCM43455 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. See Table 20 on page 91
for 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).
Broadcom®
November 5, 2015 • 43455-DS109-R
Page 68
BROADCOM CONFIDENTIAL
CYPRESS [ CYPRESS ]
