CYW4343X
Figure 43. 2-Wire Coexistence Interface to an LTE IC
GPIO_1
GPIO_2
WLAN_SECI_TX
WLAN_SECI_RX
UART_IN
WLAN
BT/FM
UART_OUT
Coexistence
Interface
CYW4343X
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.
WLAN_SECI_OUT and WLAN_SECI_IN are multiplexed on the GPIOs.
See Figure 37 on page 53 and Table 14, “UART Timing Specifications,” on page 53 for UART timing.
12.4.2 3-Wire and 4-Wire Coexistence Interfaces
Figure 44 and Figure 45 show 3-wire and 4-wire LTE coexistence examples, respectively. The following definitions apply to the
GPIOs in the figures:
■
■
■
■
For the 3-wire coexistence interface:
GPIO_2: WLAN priority output to an LTE IC.
GPIO_3: LTE_RX input from an LTE IC.
GPIO_4: LTE_TX input from an LTE IC.
For the 4-wire coexistence interface:
■
■
■
■
GPIO_1: WLAN priority output to an LTE IC.
GPIO_2: LTE frame sync input from an LTE IC. This GPIO applies only to the 4-wire coexistence interface.
GPIO_3: LTE_RX input from an LTE IC.
GPIO_4: LTE_TX input from an LTE IC.
Figure 44. 3-Wire Coexistence Interface to an LTE IC
GPIO_2
WLAN
BT/FM
WLAN Priority
LTE_RX
GPIO_3
GPIO_4
Coexistence
Interface
LTE_TX
CYW4343X
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.
Document No. 002-14797 Rev. *H
Page 61 of 128
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