1.2.1.4.1 PTA Introduction

PIC32CXBZ3 provides the Three-Wire Packet Traffic Arbitration (PTA) WLAN coexistence solution.

This coexistence solution contains three pins that exchange coordinating information between BT and WLAN. When a BT request (BT_ACTIVE=1) is received, the Wi-Fi device compares this external priority (BT_PRIORITY) request against the internal Wi-Fi priority, and can choose to either grant BT (WLAN_ACTIVE=0) or Wi-Fi (WLAN_ACTIVE=1)

These three pins are defined as:

• BT_ACTIVE: This output pin describes when BT is using the RF resources. When the signal on it is high, it means BT is asking and accessing the RF; when the signal is low, BT is not using the RF.
• BT_PRIORITY: Comparing with Time-shared design, PIC32CXBZ3 is designed as Static output signal describes the priority of the BT request. When the signal on it is high, it represents a high-priority BT request; otherwise, it is a low-priority request. See Appendix 1 for both Static and Time-shared design concepts.
• WLAN_ACTIVE: This input pin brings in the information about when the WLAN activities are taking place. When the signal is high, it means a WLAN activity is using the RF resources; when the signal is low, WLAN is not using the RF.