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BCM43455 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 | |||
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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: âUART Timing Specifications,â 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:
ï· SECI_OUT/BT_TXD and SECI_IN/BT_RXD on the BCM4345X are multiplexed on GPIO5 and GPIO4, respectively.
ï· 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.
ï· 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
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