BCM4356XKUBGT Datasheet, PDF (121/195 Pages) Cypress Semiconductor – Single-Chip 5G WiFi IEEE 802.11ac 2×2 MAC/ Baseband/Radio with Integrated Bluetooth 4.1, FM Receiver, and Wireless Charging

BCM4356 Advance Data Sheet
WLAN/BT GPIO Signals and Strapping Options
WLAN/BT GPIO Signals and Strapping Options
The pins listed in Table 23 and Table 24 are sampled at power-on reset (POR) to determine the various
operating modes. Sampling occurs a few milliseconds after an internal POR or deassertion of the external POR.
After the POR, each pin assumes the GPIO or alternative function specified in the signal descriptions table.
Each strapping option pin has an internal pull-up (PU) or pull-down (PD) resistor that determines the default
mode. To change the mode, connect an external PU resistor to VDDIO or a PD resistor to GND, using a 10 kΩ
resistor or less.
Note: Refer to the reference board schematics for more information.
Table 23: WLAN GPIO Functions and Strapping Options
Pin Name
GPIO_4
Default
Function
0
GPIO_[10, 9, 8] [0,0,0]
GPIO_12
1
Description
1: SPROM is present
0: SPROM is absent (default). Applicable in PCIe Host mode.
Note: In SDIO Host mode, sdioPadVddio is 3.3V while set to 1, and 1.8V
while set to 0.
Host interface selection: see Table 25.
1 = HTAvailable (default)
0 = ResourceModeInit is ALPAvailable. On PCBs, use a pull-down and tie
to ALP clock mode.
Pin Name
BT_GPIO4
Table 24: BT GPIO Functions and Strapping Options
Default
Function
0
Description
1: BT Serial Flash is present.
0: BT Serial Flash is absent (default)
Table 25: GPIO_[10, 9, 8] Host Interface Selection
GPIO_[10, 9, 8]
Bit Setting
WLAN Host Interface Mode
000
SDIO
010
Not used
011
PCIE
Bluetooth Mode
BTUART or BTUSB;
BT tPorts stand-alone.
BTUART or BTUSB;
BT tPorts stand-alone
BTUART or BTUSB;
BT tPorts stand-alone
Broadcom^®
May 8, 2015 • 4356-DS103-R
BROADCOM CONFIDENTIAL
Page 120