BCM43455XKUBGT Datasheet, PDF (67/159 Pages) Cypress Semiconductor – Single-Chip 5G WiFi IEEE 802.11ac MAC/Baseband/ Radio with Integrated Bluetooth 4.1 and FM Receiver

BCM43455 Preliminary 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 optimum performance.
Figure 23 shows the WCI-2 LTE coexistence interface. See Table 13: “UART Timing Specifications,” on page 57
for UART baud rate.
Figure 23: Broadcom GCI or BT-SIG WCI-2 LTE Coexistence Interface
WLAN
SECI_OUT/BT_TXD/GPIO5
GCI
SECI_IN/BT_RXD/GPIO4
LTE\IC
UART_IN
UART_OUT
BT
BCM43455
NOTES:
 SECI_OUT/BT_TXD and SECI_IN/BT_RXD on the BCM4345X are multiplexed on GPIO5 and GPIO4, respectively.
 The 2-wire LTE coexistence interface is intended for future compatibility with the BT SIG 2-wire interface that is being standardized for
Core 4.1.
 ORing to generate ISM_RX_PRIORITY for ERCX_TXCONF or BT_RX_PRIORITY is achieved by setting the GPIO mask registers
appropriately.
Figure 24 and Table 15 on page 66 define an alternate 3-wire LTE coexistence interface.
Figure 24: 3-Wire LTE Coexistence Interface
WLAN
ERCX
BT
GPIO2
GPIO3
GPIO4
BCM43455
LTE\IC
ERCX_WL_PRIO
ERCX_LTETX
ERCX_LTERX
Table 15: 3-Wire External Coexistence Interface
GPIO Name
GPIO_2
GPIO_3
GPIO_4
Coexistence Signal
ERCX_WL_PRIO
ERCX_LTE_TX
ERCX_LTE_RX
Type
Output
Input
Input
Comment
Notify LTE of request to sleep
Notify WLAN RX of requirement to sleep
Notify WLAN TX to reduce TX power
Broadcom^®
November 5, 2015 • 43455-DS109-R
BROADCOM CONFIDENTIAL
Page 66