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BCM4356 Advance Data Sheet
GPIO Interface
GPIO Interface
The BCM4356 has 11 general-purpose I/O (GPIO) pins in the WLAN section that can be used to connect to
various external devices.
Upon power-up and reset, these pins become tristated. Subsequently, they can be programmed to be either
input or output pins via the GPIO control register. In addition, the GPIO pins can be assigned to various other
functions, see Table 26: “GPIO Alternative Signal Functions,” on page 121.
External Coexistence Interface
An external handshake interface is available to enable signaling between the device and an external co-located
wireless device, such as GPS, LTE, or UWB, to manage wireless medium sharing for optimal performance.
Figure 27 and Figure 28 on page 69 show the LTE coexistence interface (including UART) for each BCM4356
package type. See Table 26: “GPIO Alternative Signal Functions,” on page 121 for further details on multiplexed
signals, such as the GPIO pins.
See Table 15: “UART Timing Specifications,” on page 58 for the UART baud rate.
Figure 27: Broadcom GCI Mode LTE Coexistence Interface
WLAN
GCI
SECI_OUT
SECI_IN
UART_IN
UART_OUT
BTFM
BCM4356
LTE/IC
Notes:
 OR’ing to generate ISM_RX_PRIORITY for ERCX_TXCONF or BT_RX_PRIORITY is achieved by
setting the GPIO mask registers appropriately.
 SECI_OUT and SECI_IN are multiplexed on the GPIOs.
Broadcom^®
May 8, 2015 • 4356-DS103-R
BROADCOM CONFIDENTIAL
Page 68