nRF70 Series PTA-based coexistence

The nRF70 Series devices offer highly configurable coexistence hardware to help mitigate interference between Wi-Fi® and devices like Bluetooth® LE, Thread®, and Zigbee®.

The coexistence hardware for the nRF70 Series has a Packet Traffic Arbitration (PTA) module connected to coexistence hardware logic functions that facilitate mitigating various interference scenarios through a highly programmable fabric. This enables flexible output signals supporting multiple interface configurations such as:
Figure 1. Interface configuration
Interface configuration
The following are supported antenna configurations:
The following figure shows the architecture of the coexistence hardware with the details of the PTA control lines.
Figure 2. Coexistence hardware architecture
Coexistence hardware architecture
Table 1. Coexistence hardware signals
Signal name I/O Mandatory/Optional Bluetooth LE/IEEE 802.15.4 signal (3-wire/4-wire) Description
COEX_REQ Input Mandatory for 3-wire and 4-wire SR_REQUEST Bluetooth LE/IEEE 802.15.4 device requesting a TX/RX transaction.
COEX_STATUS0 Input Mandatory for 3-wire and 4-wire SR_STATUS Indicates if the Bluetooth LE/IEEE 802.15.4 transaction is TX or RX. If the device supports a PRIORITY signal, it is multiplexed with TX/RX on this signal.
COEX_GRANT Output Mandatory for 3-wire and 4-wire SR_GRANT Indicates that the Bluetooth LE/IEEE 802.15.4 device is granted access for this transaction.
COEX_STATUS1/SW_CTRL1 Input/Output Optional for 3-wire SR_PTI/RF_SW_CTRL1 In 4-wire mode, this carries the Bluetooth LE/IEEE 802.15.4 1-bit PRIORITY signal. In 3-wire Shared Antenna mode, this can be optionally used as a second antenna switch control signal.
SW_CTRL0 Output Mandatory for 3-wire and 4-wire Shared Antenna mode. Optional otherwise. RF_SW_CTRL0 Used for antenna switch control in Shared Antenna mode.
Note: The behavior of SW_CTRL0/1 is programmable and dependent on the configured coexistence mode and switch control interface.