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nrf_802154: doc: Update mpsl documentation
Add information about switching multiprotocol timings Signed-off-by: Dawid Przybylo <[email protected]>
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‎nrf_802154/doc/multiprotocol_support.rst‎

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@@ -77,6 +77,8 @@ Because of the nature of the Bluetooth Low Energy protocol (TDMA), the Bluetooth
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.. _rd_multiprotocol_support_hf_clock:
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.. include:: multiprotocol_switching_tables.rst
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Handling high-frequency clock
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*****************************
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‎nrf_802154/doc/multiprotocol_switching_tables.rst‎

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Protocol and Radio Transition Measurements
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------------------------------------------
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The system measures two distinct timing metrics during protocol transitions:
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15.4 to BLE Transitions:
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Radio Switching Time:
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- Start: RX_EN (LNA) pin deactivation (15.4 radio turning off on the end of 15.4 activity)
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- End: READY pin activation for BLE operation (ble radio turned on and ready)
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- Measures how quickly the radio hardware switches modes
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Protocol Switching Time:
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- Start: First PDN event marking the end of 15.4 activity
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- End: Second PDN event marking the start of BLE activity
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- Captures the full protocol stack transition overhead
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BLE to 15.4 Transitions:
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Radio Switching Time:
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- Start: DISABLED pin event (BLE radio turning off)
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- End: READY pin activation for 15.4 operation (15.4 radio turned on and ready)
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- Measures how quickly the radio hardware switches modes
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Protocol Switching Time:
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- Start: PDN event at the end of BLE activity
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- End: PDN event at the start of 15.4 activity
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- Captures the full protocol stack transition overhead
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The measurements are collected during BLE advertisement, scanning, and connection activities.
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Described measurement uses the nRF21540 Front-End Module (Eagle) to precisely track radio state transitions
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through its control pins. Here's what this specific event means:
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The nRF21540 (Eagle) is a power amplifier and low-noise amplifier module that enhances RF performance. In this
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test setup, it's connected to the Nordic SoC and provides critical timing information through its control pins.
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The RX_EN pin specifically controls the Low-Noise Amplifier (LNA) function of the Eagle:
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- When RX_EN is high (activated): The LNA is enabled, amplifying incoming RF signals during receive
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operations
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- When RX_EN is low (deactivated): The LNA is disabled, indicating receive operations are stopping or radio
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is deactivated on the end of time slot.
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The PDN signal provides key information about when the module fully powers down or powers up during protocol
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transitions.
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Disclaimer
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----------
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.. note:: All information and tables below are strictly informational, do not represent requirements, and were measured using Nordic DK development kits.
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Multiprotocol switching time comparison by device family
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--------------------------------------------------------
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Protocol Switching Time
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^^^^^^^^^^^^^^^^^^^^^^^
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+-------------------+-----------+-----------------+-----------------+-----------------+
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| BLE activity name | Direction | NRF52 mean [us] | NRF53 mean [us] | NR54L mean [us] |
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+===================+===========+=================+=================+=================+
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| advertisement | 15.4→BLE | 257 | 261 | 205 |
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+-------------------+-----------+-----------------+-----------------+-----------------+
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| advertisement | BLE→15.4 | 152 | 181 | 80 |
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+-------------------+-----------+-----------------+-----------------+-----------------+
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| scanning | 15.4→BLE | 251 | 251 | 210 |
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+-------------------+-----------+-----------------+-----------------+-----------------+
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| scanning | BLE→15.4 | 135 | 183 | 76 |
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+-------------------+-----------+-----------------+-----------------+-----------------+
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| connection | 15.4→BLE | 258 | 258 | 214 |
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+-------------------+-----------+-----------------+-----------------+-----------------+
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| connection | BLE→15.4 | 149 | 182 | 80 |
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+-------------------+-----------+-----------------+-----------------+-----------------+
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Radio Switching Time
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^^^^^^^^^^^^^^^^^^^^
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+-------------------+-----------+-----------------+-----------------+-----------------+
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| BLE activity name | Direction | NRF52 mean [us] | NRF53 mean [us] | NR54L mean [us] |
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+===================+===========+=================+=================+=================+
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| advertisement | 15.4→BLE | 324 | 346 | 268 |
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+-------------------+-----------+-----------------+-----------------+-----------------+
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| advertisement | BLE→15.4 | 289 | 335 | 172 |
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+-------------------+-----------+-----------------+-----------------+-----------------+
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| scanning | 15.4→BLE | 303 | 315 | 256 |
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+-------------------+-----------+-----------------+-----------------+-----------------+
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| scanning | BLE→15.4 | 234 | 292 | 150 |
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+-------------------+-----------+-----------------+-----------------+-----------------+
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| connection | 15.4→BLE | 386 | 388 | 348 |
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+-------------------+-----------+-----------------+-----------------+-----------------+
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| connection | BLE→15.4 | 333 | 398 | 211 |
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+-------------------+-----------+-----------------+-----------------+-----------------+
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Multiprotocol switching time measurements by device family
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----------------------------------------------------------
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NRF52 family
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^^^^^^^^^^^^
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+-------------------+-----------+--------------------------------------------+-----------------------------------------+
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| BLE activity name | Direction | Protocol Switching (min | mean | max) [us] | Radio Switching (min | mean | max) [us] |
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+===================+===========+============================================+=========================================+
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| advertisement | 15.4→BLE | 238 | 257 | 359 | 305 | 324 | 427 |
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+-------------------+-----------+--------------------------------------------+-----------------------------------------+
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| advertisement | BLE→15.4 | 136 | 152 | 163 | 273 | 289 | 299 |
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+-------------------+-----------+--------------------------------------------+-----------------------------------------+
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| scanning | 15.4→BLE | 235 | 251 | 265 | 287 | 303 | 317 |
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+-------------------+-----------+--------------------------------------------+-----------------------------------------+
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| scanning | BLE→15.4 | 133 | 135 | 141 | 232 | 234 | 239 |
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+-------------------+-----------+--------------------------------------------+-----------------------------------------+
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| connection | 15.4→BLE | 243 | 258 | 275 | 372 | 386 | 398 |
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+-------------------+-----------+--------------------------------------------+-----------------------------------------+
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| connection | BLE→15.4 | 135 | 149 | 165 | 312 | 333 | 354 |
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+-------------------+-----------+--------------------------------------------+-----------------------------------------+
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NRF53 family
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^^^^^^^^^^^^
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+-------------------+-----------+--------------------------------------------+-----------------------------------------+
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| BLE activity name | Direction | Protocol Switching (min | mean | max) [us] | Radio Switching (min | mean | max) [us] |
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+===================+===========+============================================+=========================================+
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| advertisement | 15.4→BLE | 236 | 261 | 420 | 320 | 346 | 505 |
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+-------------------+-----------+--------------------------------------------+-----------------------------------------+
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| advertisement | BLE→15.4 | 169 | 181 | 197 | 324 | 335 | 352 |
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+-------------------+-----------+--------------------------------------------+-----------------------------------------+
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| scanning | 15.4→BLE | 234 | 251 | 265 | 298 | 315 | 328 |
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+-------------------+-----------+--------------------------------------------+-----------------------------------------+
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| scanning | BLE→15.4 | 181 | 183 | 196 | 290 | 292 | 305 |
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+-------------------+-----------+--------------------------------------------+-----------------------------------------+
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| connection | 15.4→BLE | 244 | 258 | 275 | 375 | 388 | 401 |
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+-------------------+-----------+--------------------------------------------+-----------------------------------------+
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| connection | BLE→15.4 | 167 | 182 | 196 | 379 | 398 | 418 |
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+-------------------+-----------+--------------------------------------------+-----------------------------------------+
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NR54L family
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^^^^^^^^^^^^
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+-------------------+-----------+--------------------------------------------+-----------------------------------------+
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| BLE activity name | Direction | Protocol Switching (min | mean | max) [us] | Radio Switching (min | mean | max) [us] |
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+===================+===========+============================================+=========================================+
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| advertisement | 15.4→BLE | 118 | 205 | 209 | 184 | 268 | 273 |
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+-------------------+-----------+--------------------------------------------+-----------------------------------------+
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| advertisement | BLE→15.4 | 79 | 80 | 80 | 171 | 172 | 173 |
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+-------------------+-----------+--------------------------------------------+-----------------------------------------+
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| scanning | 15.4→BLE | 209 | 210 | 211 | 255 | 256 | 257 |
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+-------------------+-----------+--------------------------------------------+-----------------------------------------+
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| scanning | BLE→15.4 | 75 | 76 | 77 | 149 | 150 | 150 |
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+-------------------+-----------+--------------------------------------------+-----------------------------------------+
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| connection | 15.4→BLE | 212 | 214 | 223 | 345 | 348 | 348 |
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+-------------------+-----------+--------------------------------------------+-----------------------------------------+
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| connection | BLE→15.4 | 79 | 80 | 80 | 195 | 211 | 225 |
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+-------------------+-----------+--------------------------------------------+-----------------------------------------+

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