NRF7002-CEAA-R7 datasheet(25/69 Pages) NORDIC

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Coexistence

Time instance

Description

The time instance when SR_REQUEST is asserted.

The time instance when SR_STATUS is sampled to get SR_PTI information. This can be

any time during T2.

The time instance when PTA takes an arbitration decision and posts SR_GRANT to the

Bluetooth LE/IEEE 802.15.4 device. This is chosen a couple of microseconds before

the start of the SR grant lead time period. This ensures that SR_GRANT is asserted

as close to SR grant lead time period and is stable by the time the Bluetooth LE/IEEE

802.15.4 device uses this information to continue or abort the transaction.

The time instance when the SR grant lead time period starts. This is the time when

SR_GRANT must be stable to be considered by the Bluetooth LE/IEEE 802.15.4 device.

The time instance when the actual transaction of the Bluetooth LE/IEEE 802.15.4

device starts. This is the time when the signaling period ends and the transaction

period starts. Bluetooth LE/IEEE 802.15.4 Tx and Rx information is provided by

changing the SR_STATUS signal level appropriately. PTA should track SR_STATUS if

SR_REQUEST is high and update the information SR_TX_RX.

Table 9: Time instances

3-wire without multiplexed priority

If SR_STATUS carries only one parameter information (3-wire, no priority mode), then the default

information that it carries is SR_TX_RX. In this case, SR_STATUS is set to TX or RX when SR_REQUEST

is HIGH. The following diagram shows SR_STATUS only carrying TX/RX information. The signals are

represented as a bus even though they are single bit ports to indicate transitions happening on the ports.

SR_REQUEST

SR_REQUEST lead time

Transaction time

Tx/Rx

SR_STATUS

t3 t4

time

SR_GRANT

Grant

Figure 15: 3-wire timing without priority multiplexing

During the transaction, the Bluetooth LE/IEEE 802.15.4 device changes SR_STATUS appropriately to

indicate TX and RX information. PTA continuously tracks SR_STATUS while SR_REQUEST is high and updates

SR_TX_RX status internally for corresponding COEX behavior.

4-wire timing

In the following diagram, Bluetooth LE/IEEE 802.15.4 priority is explicitly signaled on the

BT_COEX_STATUS1 pin.

4486_184 v1.2

NRF7002-CEAA-R7 Datasheet(PDF) 25 Page - Nordic Semiconductor