• Pressing the
Hardware Reset
button.
• Pressing and holding the
On/Off Soft Reset
button for more than two seconds.
• A powerdown request from the operating system.
2. The
System Control Processor
(SCP) signals a powerdown request to the application cluster, that is,
either the Cortex-A72 cluster or the Cortex-A53 cluster.
3. The application cluster goes through its cleanup and shutdown sequence.
4. The application cluster goes to the
Wait for Interrupt
(WFI) state.
5. The
Power Policy Unit
(PPU) sees the WFI state and powers down.
Note
The SCP waits for this sequence to complete.
6. The SCP powers down the Cortex-A53, Cortex-A72, VSYS, and Mali-T624 GPU.
7. The SCP signals to the MCC, using the
Power Management IC
(PMIC),
Ready for Shutdown
.
8. The MCC applies
CB_nPOR
and disables the board clocks and the PMIC.
Note
The
CB_nPOR
signal drives the
nPORESET
signal inside the Juno r2 SoC.
9. The V2M-Juno r2 motherboard is in the standby-state until pressing the
On/Off/Soft Reset
button
initiates the powerup and configuration sequence.
3.2.4
Sleep-state sequence
The sleep-state is a low power mode of the Juno r2 SoC that preserves operating data and the application
code state. The sleep-mode sequence takes the Juno r2 SoC from the operating-state to the sleep-state.
The operating-state to sleep-state sequence is as follows:
1. A short press of the
On/Off/Soft Reset
button, less than two seconds.
Warning
Pressing and holding the
On/Off/Soft Reset
button for more than two seconds initiates the powerdown
sequence and puts the V2M-Juno r2 motherboard into the standby-state. This might result in loss of
data.
2. The
System Control Processor
(SCP) sends the
Message Handling Unit
(MHU) sleep command to
the application cluster, that is, either the Cortex-A72 or Cortex-A53.
3. The application cluster goes through its cleanup and shutdown sequence. The application cluster goes
to the
Wait for Interrupt
(WFI) state.
4. The
Power Policy Unit
(PPU) sees the WFI state and powers down.
Note
The SCP waits for this sequence to complete.
5. The SCP powers down the Cortex-A53, Cortex-A72, VSYS, and Mali-T624 GPU.
6. The SCP maintains on-chip RAM and secure RAM data. This data is available when the Juno r2 SoC
returns to the operating-state.
7. The Juno r2 SoC is in the sleep-state until a short press, less than two seconds, of the
On/Off/Soft
Reset
button initiates the wake up sequence and returns it to the operating-state.
3.2.5
Wake-up sequence
The wake-up sequence takes the Juno r2 SoC from the sleep-state to the operating-state. Application
software resumes operation from the previous operating point with all data restored.
3 Configuration
3.2 Configuration process and operating modes
ARM 100114_0200_03_en
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