BCM4354 Data Sheet
External Coexistence Interface
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
SECI_OUT
UART_IN
WLAN
SECI_IN
UART_OUT
GCI
BTFM
BCM4354
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.
Figure 25: Legacy 3-Wire LTE Coexistence Interface
GCI_GPIO_2
WCN_PRIORITY
WLAN
GCI_GPIO_1
GCI
MWS_RX, LTE_PRIORITY
LTE_FRAME_SYNC
GCI_GPIO_0
BT/FM
BCM4354
LTE/IC
Note: OR’ing to generate WCN_PRIORITY FOR ERCX_TXCONF or BT_RX_PRIORITY is achieved by
setting the GPIO mask registers appropriately.
Broadcom®
October 15, 2014 • 4354-DS109-R
Page 67
BROADCOM CONFIDENTIAL
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