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External Coexistence Interface

BCM4354 Data Sheet

BROADCOM CONFIDENTIAL

Broadcom®

October 15, 2014 • 4354-DS109-R

Page 67

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, or LTE, to manage wireless medium sharing for optimal performance.

Figure 24 and Figure 25 on page 67 show the LTE coexistence interface (including UART) for each BCM4354

package type. See Table 26: “GPIO Alternative Signal Functions,” on page 120 for further details on multiplexed

signals, such as the GPIO pins.

See Table 15: “UART Timing Specifications,” on page 57 for the UART baud rate.

Figure 24: Broadcom GCI Mode LTE Coexistence Interface

Figure 25: Legacy 3-Wire LTE Coexistence Interface

WLAN

GCI

LTE/IC

UART_IN

UART_OUT

BTFM

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.

SECI_OUT

SECI_IN

BCM4354

Note: OR’ing to generate WCN_PRIORITY FOR ERCX_TXCONF or BT_RX_PRIORITY is achieved by

setting the GPIO mask registers appropriately.

WLAN

GCI

LTE/IC

BT/FM

WCN_PRIORITY

GCI_GPIO_2

GCI_GPIO_1

GCI_GPIO_0

MWS_RX, LTE_PRIORITY

LTE_FRAME_SYNC

BCM4354

BCM4354 Datasheet(PDF) 68 Page - Cypress Semiconductor