Difference between revisions of "PinePhone Power Management"

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! Name/GPIO
! Name/GPIO
! Output Voltage
! Output Voltage
! Disable at runtime?
! Can disable at runtime?
! Disable in suspend?
! Can disable in suspend?
! Uses (internal/external separated by semicolon)
! Consumers (internal/external separated by semicolon)
|-
|-
| DCDC1
| DCDC1
| 3.3V
| 3.3V
| No
| No
| Yes (breaks MMC0)
| No (VCC-IO)
| VCC-EFUSE, VCC-IO, VCC-PC (VQMMC2), VCC-PD, VCC-USB; Modem I2C/PCM/UART, Motor, Pogo I2C, UART0, VMMC0, VMMC2, WiFi CHIP_EN
| VCC-EFUSE, VCC-IO, VCC-PC (VQMMC2), VCC-PD, VCC-USB; Modem [I2C, PCM, UART], Motor, Pogo I2C, UART0, VMMC0, VMMC2, WiFi CHIP_EN
|-
|-
| DCDC2
| DCDC2
Line 64: Line 64:
| 1.8V
| 1.8V
| No
| No
| No
| No (VCC-PL)
| VCC-PL; Pogo INT
| VCC-PL; Pogo INT
|-
|-
Line 70: Line 70:
| 3.0V
| 3.0V
| No
| No
| Yes (future)
| No (KEYADC)
| AVCC, KEYADC, VCC-PLL
| AVCC, KEYADC, VCC-PLL
|-
|-
| DLDO1
| DLDO1
| 3.3V
| 3.3V
| No (ANX7688 [AVDD33, VCONN_EN Disable Pull-up])
| No
| No
| No (ANX7688 AVDD33)
| HVCC, VCC-DSI; ANX7688 [AVDD33, HDMI_VT, I2C, ANX-V1.0 Enable, VCONN_EN Disable Pull-up], HDMI [DDC, HPD], Proximity LED, Sensor I2C, Sensor VDD
| HVCC, VCC-DSI; ANX7688 [AVDD33, HDMI_VT, I2C, ANX-V1.0 Enable, VCONN_EN Disable Pull-up], HDMI [DDC, HPD], Proximity LED, Sensor I2C, Sensor VDD
|-
|-
| DLDO2
| DLDO2
| 1.8V
| 1.8V? 3.3V?
| Yes
| Yes
| Yes
| Yes
Line 92: Line 92:
|-
|-
| DLDO4
| DLDO4
| 1.8-3.3V
| 1.8V-3.3V
| Yes
| Yes
| Yes
| Yes
Line 128: Line 128:
|-
|-
| GPIO0-LDO
| GPIO0-LDO
| 2.8V-3.3V
| 3.3V
| Yes
| Yes
| Yes
| Yes
| Backlight PWM, LCD, Proximity sensor, Touchscreen [I2C, VCC]
| Backlight PWM, LCD, Proximity sensor VDD, Touchscreen [I2C, VCC]
|-
|-
| GPIO1-LDO
| GPIO1-LDO
| 1.8V
| 1.8V
| No (ANX7688 DVDD1V8)
| No
| No (ANX7688 DVDD1V8)
| No (ANX7688 DVDD1V8)
| ANX7688 [AVDD1V8, DVDD1V8, CC, HDMI DDC, I2C, Power/Reset pull-up]
| ANX7688 [AVDD1V8, DVDD1V8, CC, HDMI DDC, I2C, Power/Reset pull-up]
Line 176: Line 176:
|}
|}


=== Suggested Changes ===
=== Suggested Regulator Hardware Changes ===


==== ANX7688 ====
==== ANX7688 ====


# Move ANX7688 AVDD33 (the chip input only, not the other things connected to 3v3) and ANX7688 I2C Level Shift (3.3V side) from DLD01 to DCDC1
# Move ANX7688 AVDD33 (the chip input only, not the other things connected to 3v3) and ANX7688 I2C Level Shift (3.3V side) from DLD01 to DCDC1, and ANX7688 VCONN_EN Disable Pull-up (R1355 and R1366) from DLDO1 to ANX1.8V
# Move ANX7688 DVDD1V8 (the chip input only, not the other things labeled DVDD1V8) from GPIO1-LDO to ALDO2
# <strike>Move ANX7688 ANX1.8V from GPIO1-LDO to ALDO2</strike>
# Move ANX7688 ANX-V1.0 Regulator Enable and ANX7688 VCONN_EN Disable Pull-up from DLDO1 to GPIO1-LDO
# Move ANX7688 ANX-V1.0 Regulator Enable (R1352) from DLDO1 to a GPIO
 
These are all medium priority.


The result of these changes would be that:
The result of these changes would be that:
# The always-on part of the ANX7688 chip will always be powered
# The always-on part of the ANX7688 chip (AVDD33, DVDD1V8) will always be powered
# GPIO1-LDO only needs to be powered when a USB cable is detected, and is enough to power the rest of the chip (except HDMI)
# GPIO1-LDO only needs to be powered when a USB cable is detected, and is enough to power the rest of the chip (except HDMI)
# DLDO1 only needs to be enabled if the display pipeline or sensors are active, even if a USB cable is plugged in
# DLDO1 only needs to be enabled if the display pipeline or sensors are active, even if a USB cable is plugged in
<!--==== Sensors ====
# This may or may not be a good idea, so it's a very weak suggestion: Swap the VDD and LEDA inputs of the STK3311-A sensor, moving VDD to DLDO1 and LEDA to GPIO0-LDO. The sensor VDD needs to match the I2C voltage, and the LED driver should be on a separate power supply from the sensors. There is some concern, because GPIO0-LDO has a 100mA limit, but the proximity sensor should work properly at the lowest LED drive current (12.5mA).
-->
=== Assignments after Suggested Changes ===
Note: Only regulators that were modified are included here.
{| class="wikitable"
|-
! Name/GPIO
! Output Voltage
! Can disable at runtime?
! Can disable in suspend?
! Consumers (internal/external separated by semicolon)
|-
| DCDC1
| 3.3V
| No
| No (VCC-IO)
| VCC-EFUSE, VCC-IO, VCC-PC (VQMMC2), VCC-PD, VCC-USB; ANX7688 [AVDD33, I2C], Modem [I2C, PCM, UART], Motor, Pogo I2C, UART0, VMMC0, VMMC2, WiFi CHIP_EN
|-
| ALDO2
| 1.8V
| No
| No (VCC-PL)
| VCC-PL; ANX7688 [DVDD1V8], Pogo INT
|-
| DLDO1
| 3.3V
| Yes
| Yes
| HVCC, VCC-DSI; ANX7688 [HDMI_VT], HDMI [DDC, HPD], Proximity sensor VDD, Sensor I2C, Sensor VDD
|-
| GPIO0-LDO
| 3.3V
| Yes
| Yes
| Backlight PWM, LCD, Proximity LED, Touchscreen [I2C, VCC]
|-
| GPIO1-LDO
| 1.8V
| Yes
| Yes
| ANX7688 [ANX-V1.0 Enable, AVDD1V8, CC, HDMI DDC, I2C, Power/Reset pull-up, VCONN_EN Disable Pull-up]
|}


=== Open Questions ===
=== Open Questions ===


* How is ANX1.8V actually powered? from GPIO1-LDO or PS or both?
* How is ANX1.8V actually powered? from GPIO1-LDO (R1309) or PS (U1301) or both?
* What exactly is the modem PWRKEY connected to?
* Is DLDO2 supposed to be 1.8V or 3.3V? The schematic says both in different places.
** From LCD and LCD controller datasheets, this should be 1.8V.
* If DLDO2 is 3.3V, can we spread the HDMI/DSI/Sensors better across DLDO1 and DLDO2 so they can be more independent?
** Looks like this is N/A, because DLDO2 should be 1.8V.


== GPIO ==
== GPIO ==


=== Current Port L Assignments ===
=== Current Modem Pin Assignments ===
 
Note: only pins relevant to power management are included in this table.
 
{| class="wikitable"
|-
! Pin
! Signal Name
! Description
! Direction (as modem)
! Needed in suspend?
! Connected to
|-
| 1
| <tt>WAKEUP_IN</tt>
| Drive low to wake up the modem
| I
| No
| PH7 (active high)
|-
| 2
| <tt>AP_READY</tt>
| Drive high/low to signal the A64 is ready to receive URCs
| I
| No (if held)
| NC
|-
| 4
| <tt>W_DISABLE#</tt>
| Drive low to enter Airplane Mode
| I
| No (if held/tristate)
| PH8 (active high)
|-
| 20
| <tt>RESET_N</tt>
| Drive low to reset the modem
| I
| No (if held/tristate)
| PC4 (active high)
|-
| 21
| <tt>PWRKEY</tt>
| Drive low to turn the modem on/off
| I
| No (if held/tristate)
| PB3 (active high)
|-
| 61
| <tt>STATUS</tt>
| Open drain output, pulled low when the modem is on
| O
| No
| PB3
|-
| 62
| <tt>RI</tt>
| Pulled low to request host wakeup
| O
| Yes
| PB2
|-
| 66
| <tt>DTR</tt>
| Drive low to wake up the modem
| I
| No
| PL6 (active low)
|}
 
=== Current Port L Pin Assignments ===
 
{| class="wikitable"
|-
! Pin
! Signal Name
! Description
! Direction
! Needed in suspend?
|-
| PL0
| <tt>PMU-SCK</tt>
| AXP803 I2C/RSB Clock
| O
| Yes
|-
| PL1
| <tt>PMU-SDA</tt>
| AXP803 I2C/RSB Data
| I/O
| Yes
|-
| PL2
| <tt>WL-REG-ON</tt>
| Not Connected
| N/A
| N/A
|-
| PL3
| <tt>WL-WAKE-AP</tt>
| Wake-on-WLAN Interrupt
| I
| Yes
|-
| PL4
| <tt>BT-RST-N</tt>
| Bluetooth Reset Control
| O
| No (if held)
|-
| PL5
| <tt>BT-WAKE-AP</tt>
| Wake-on-BT Interrupt
| I
| Yes
|-
| PL6
| <tt>DTR</tt>
| Modem DTR (Wakeup Request)
| O
| No
|-
| PL7
| <tt>4G-PWR-BAT</tt>
| Modem Power Supply Control
| O
| No (if held)
|-
| PL8
| <tt>ANX7688-CABLE_DET</tt>
| ANX7688 Cable Detection Interrupt
| I
| Yes
|-
| PL9
| <tt>ANX_RESET</tt>
| ANX7688 Reset Control
| O
| No (if held)
|-
| PL10
| <tt>LCD-PWM</tt>
| LCD Backlight PWM Brightness Control
| O
| No
|-
| PL11
| <tt>ANX7688-INT</tt>
| ANX7688 Alert Interrupt
| I
| Yes
|-
| PL12
| <tt>POGO-INT</tt>
| Pogo Pin Interrupt
| I
| Yes
|}


=== Pins Held During Suspend ===
=== Pins Held During Suspend ===
Line 202: Line 412:
=== Pins Active During Suspend ===
=== Pins Active During Suspend ===


=== Suggested Changes ===
=== Suggested GPIO Hardware Changes ===
 
# Connect <tt>WL-REG-ON</tt> (PL2) to <tt>WL-PMU-EN</tt> (WiFi). ''bugfix''
# Connect the LIS3MDL <tt>DRDY</tt> pin, not <tt>INT</tt> pin, to PB1. ''bugfix''
# Reconnect <tt>LINEOUTN</tt> to make the line output differential.
# Connect PH7 to <tt>AP_READY</tt> instead of <tt>WAKEUP_IN</tt>. Since the A64 needs to drive this pin high (no pull-up on the modem side), this uses the level shifter channel previously used by RI (U1503 channel 4).
# Swap <tt>DTR</tt> (was at PL6, now at PB2 with U1503 channel 3 level shift) and <tt>RI</tt> (was at PB2, now at PL6 with '''no level shift''', but a pull-up to ALDO2 on the A64 side*). ''partly a bugfix''
# Connect the modem <tt>PWRKEY</tt> to PB3 only, not <tt>STATUS</tt> or DCDC1 (depopulate R1526). ''bugfix''
# Connect the modem <tt>STATUS</tt> to PH9. This is an open-drain signal, so it needs a pull-up on the A64 side. ''bugfix''
# Disconnect the modem I2C. The level shifter can be repurposed for the next change (modem debug UART).
# <strike>Connect the modem debug UART TX/RX to PD0-1.</strike>
# <strike>Move the modem main UART TX/RX to PD2-3. Motor and CSI reset that are currently at PD2-3 would need to be moved elsewhere.</strike>
# Connect both AXP803 <tt>USB-DRVVBUS</tt> (populate R1300) and ANX7688 <tt>VBUS_CTRL</tt> to <tt>DRVVBUS</tt> (in addition to PD6).
## <strike>Connecting to ANX7688 <tt>VBUS_CTRL</tt> would need a level shift to 1.8V.</strike>
## Alternatively, swap PL9 and PD6, so the level shift is not necessary, since PL9 is already a 1.8V logic level.
## <strike>Alternatively, do not connect ANX7688 <tt>VBUS_CTRL</tt>, and at least populate R1300 to connect AXP803 <tt>USB-DRVVBUS</tt>.</strike>
# Reorient the transistors for <tt>ANX_POWER</tt> (PD10) and <tt>ANX_RESET</tt> (PL9) so they do not invert their input, and (more importantly) produce a low-level output by default. (Since PL9 is already at 1.8V, it may no longer need a transistor.)
# <strike>Remove the transistors inverting <tt>VCONN1_EN</tt> and <tt>VCONN2_EN</tt>, and use a pull-up to <tt>DVDD1V8</tt> (that is really already present) instead of the pull-up to <tt>3V3</tt>.</strike>
 
'''Note:'''
Changes 1-7 and 11 are high priority.
Changes 12-13 are medium priority.
Changes 8-10 are low priority.
 
&#42; There should be at least one pin where the default value at boot changes, due to being pulled differently, for use in distinguishing the hardware revisions. In v1.1, PL6 reads 0 at boot. Since RI is an active-low interrupt, it needs a pull up. And it doesn't need any level translation. So that's our perfect opportunity. If PL6 reads low at boot, it's a v1.1 device; if PL6 reads high at boot, it's a v1.2 device.
 
=== Open Questions ===
 
* What exactly is the modem PWRKEY currently connected to? PB3? STATUS? DCDC1?
* Currently STATUS pin is connected to PWRKEY and to PB3. STATUS can't be read reliably since voltage divider from R1526 and R1517 places the STATUS signal at 0V or 0.5*Vcc-IO, which is unspecified input value according to A64 datasheet (Vih is 0.7*Vcc-IO, Vil is 0.3*Vcc-IO, the range in between is unspecified).
 
[[Category:PinePhone]] [[Category:Allwinner A64]]

Latest revision as of 14:57, 26 April 2021

The data on this page is based on the the PinePhone v1.1 - Braveheart.

Regulators

Current Assignments

Name/GPIO Output Voltage Can disable at runtime? Can disable in suspend? Consumers (internal/external separated by semicolon)
DCDC1 3.3V No No (VCC-IO) VCC-EFUSE, VCC-IO, VCC-PC (VQMMC2), VCC-PD, VCC-USB; Modem [I2C, PCM, UART], Motor, Pogo I2C, UART0, VMMC0, VMMC2, WiFi CHIP_EN
DCDC2 DVFS No Yes VDD-CPUX
DCDC3 DVFS N/A N/A VDD-CPUX (polyphase with DCDC2)
DCDC4 N/A Yes Yes Not used
DCDC5 1.2V No Yes (future) VCC-DRAM; DRAM
DCDC6 1.1V No Yes (future) VDD-SYS
DC1SW N/A Yes Yes Not used
ALDO1 2.8V Yes Yes VCC-PE; Camera AFVCC, Camera DOVDD, CSI I2C, Pogo I2C
ALDO2 1.8V No No (VCC-PL) VCC-PL; Pogo INT
ALDO3 3.0V No No (KEYADC) AVCC, KEYADC, VCC-PLL
DLDO1 3.3V No No (ANX7688 AVDD33) HVCC, VCC-DSI; ANX7688 [AVDD33, HDMI_VT, I2C, ANX-V1.0 Enable, VCONN_EN Disable Pull-up], HDMI [DDC, HPD], Proximity LED, Sensor I2C, Sensor VDD
DLDO2 1.8V? 3.3V? Yes Yes MIPI-DSI VIO
DLDO3 2.8V Yes Yes Camera AVDD
DLDO4 1.8V-3.3V Yes Yes VCC-PG; VQMMC1
ELDO1 1.8V No No (DRAM) CPVDD; DRAM
ELDO2 N/A Yes Yes Not used
ELDO3 1.8V Yes Yes Camera DVDD
FLDO1 1.2V Yes Yes HSIC-VCC (not used)
FLDO2 1.1V No No (VDD-CPUS) VDD-CPUS
GPIO0-LDO 3.3V Yes Yes Backlight PWM, LCD, Proximity sensor VDD, Touchscreen [I2C, VCC]
GPIO1-LDO 1.8V No No (ANX7688 DVDD1V8) ANX7688 [AVDD1V8, DVDD1V8, CC, HDMI DDC, I2C, Power/Reset pull-up]
PD6 5.0V Yes Yes USB OTG
PD8 5.0V Yes Yes Pogo supply, USB OTG via PD6
PD9 5.0V Yes Yes VCONN (USB Type C)
PH10 PWM Yes Yes Backlight
PL7 VBAT Yes Yes Modem
ANX-V1.0 1.0V Yes Yes ANX7688 [AVDD1V0, DVDD1V0]

Suggested Regulator Hardware Changes

ANX7688

  1. Move ANX7688 AVDD33 (the chip input only, not the other things connected to 3v3) and ANX7688 I2C Level Shift (3.3V side) from DLD01 to DCDC1, and ANX7688 VCONN_EN Disable Pull-up (R1355 and R1366) from DLDO1 to ANX1.8V
  2. Move ANX7688 ANX1.8V from GPIO1-LDO to ALDO2
  3. Move ANX7688 ANX-V1.0 Regulator Enable (R1352) from DLDO1 to a GPIO

These are all medium priority.

The result of these changes would be that:

  1. The always-on part of the ANX7688 chip (AVDD33, DVDD1V8) will always be powered
  2. GPIO1-LDO only needs to be powered when a USB cable is detected, and is enough to power the rest of the chip (except HDMI)
  3. DLDO1 only needs to be enabled if the display pipeline or sensors are active, even if a USB cable is plugged in

Assignments after Suggested Changes

Note: Only regulators that were modified are included here.

Name/GPIO Output Voltage Can disable at runtime? Can disable in suspend? Consumers (internal/external separated by semicolon)
DCDC1 3.3V No No (VCC-IO) VCC-EFUSE, VCC-IO, VCC-PC (VQMMC2), VCC-PD, VCC-USB; ANX7688 [AVDD33, I2C], Modem [I2C, PCM, UART], Motor, Pogo I2C, UART0, VMMC0, VMMC2, WiFi CHIP_EN
ALDO2 1.8V No No (VCC-PL) VCC-PL; ANX7688 [DVDD1V8], Pogo INT
DLDO1 3.3V Yes Yes HVCC, VCC-DSI; ANX7688 [HDMI_VT], HDMI [DDC, HPD], Proximity sensor VDD, Sensor I2C, Sensor VDD
GPIO0-LDO 3.3V Yes Yes Backlight PWM, LCD, Proximity LED, Touchscreen [I2C, VCC]
GPIO1-LDO 1.8V Yes Yes ANX7688 [ANX-V1.0 Enable, AVDD1V8, CC, HDMI DDC, I2C, Power/Reset pull-up, VCONN_EN Disable Pull-up]

Open Questions

  • How is ANX1.8V actually powered? from GPIO1-LDO (R1309) or PS (U1301) or both?
  • Is DLDO2 supposed to be 1.8V or 3.3V? The schematic says both in different places.
    • From LCD and LCD controller datasheets, this should be 1.8V.
  • If DLDO2 is 3.3V, can we spread the HDMI/DSI/Sensors better across DLDO1 and DLDO2 so they can be more independent?
    • Looks like this is N/A, because DLDO2 should be 1.8V.

GPIO

Current Modem Pin Assignments

Note: only pins relevant to power management are included in this table.

Pin Signal Name Description Direction (as modem) Needed in suspend? Connected to
1 WAKEUP_IN Drive low to wake up the modem I No PH7 (active high)
2 AP_READY Drive high/low to signal the A64 is ready to receive URCs I No (if held) NC
4 W_DISABLE# Drive low to enter Airplane Mode I No (if held/tristate) PH8 (active high)
20 RESET_N Drive low to reset the modem I No (if held/tristate) PC4 (active high)
21 PWRKEY Drive low to turn the modem on/off I No (if held/tristate) PB3 (active high)
61 STATUS Open drain output, pulled low when the modem is on O No PB3
62 RI Pulled low to request host wakeup O Yes PB2
66 DTR Drive low to wake up the modem I No PL6 (active low)

Current Port L Pin Assignments

Pin Signal Name Description Direction Needed in suspend?
PL0 PMU-SCK AXP803 I2C/RSB Clock O Yes
PL1 PMU-SDA AXP803 I2C/RSB Data I/O Yes
PL2 WL-REG-ON Not Connected N/A N/A
PL3 WL-WAKE-AP Wake-on-WLAN Interrupt I Yes
PL4 BT-RST-N Bluetooth Reset Control O No (if held)
PL5 BT-WAKE-AP Wake-on-BT Interrupt I Yes
PL6 DTR Modem DTR (Wakeup Request) O No
PL7 4G-PWR-BAT Modem Power Supply Control O No (if held)
PL8 ANX7688-CABLE_DET ANX7688 Cable Detection Interrupt I Yes
PL9 ANX_RESET ANX7688 Reset Control O No (if held)
PL10 LCD-PWM LCD Backlight PWM Brightness Control O No
PL11 ANX7688-INT ANX7688 Alert Interrupt I Yes
PL12 POGO-INT Pogo Pin Interrupt I Yes

Pins Held During Suspend

Pins Active During Suspend

Suggested GPIO Hardware Changes

  1. Connect WL-REG-ON (PL2) to WL-PMU-EN (WiFi). bugfix
  2. Connect the LIS3MDL DRDY pin, not INT pin, to PB1. bugfix
  3. Reconnect LINEOUTN to make the line output differential.
  4. Connect PH7 to AP_READY instead of WAKEUP_IN. Since the A64 needs to drive this pin high (no pull-up on the modem side), this uses the level shifter channel previously used by RI (U1503 channel 4).
  5. Swap DTR (was at PL6, now at PB2 with U1503 channel 3 level shift) and RI (was at PB2, now at PL6 with no level shift, but a pull-up to ALDO2 on the A64 side*). partly a bugfix
  6. Connect the modem PWRKEY to PB3 only, not STATUS or DCDC1 (depopulate R1526). bugfix
  7. Connect the modem STATUS to PH9. This is an open-drain signal, so it needs a pull-up on the A64 side. bugfix
  8. Disconnect the modem I2C. The level shifter can be repurposed for the next change (modem debug UART).
  9. Connect the modem debug UART TX/RX to PD0-1.
  10. Move the modem main UART TX/RX to PD2-3. Motor and CSI reset that are currently at PD2-3 would need to be moved elsewhere.
  11. Connect both AXP803 USB-DRVVBUS (populate R1300) and ANX7688 VBUS_CTRL to DRVVBUS (in addition to PD6).
    1. Connecting to ANX7688 VBUS_CTRL would need a level shift to 1.8V.
    2. Alternatively, swap PL9 and PD6, so the level shift is not necessary, since PL9 is already a 1.8V logic level.
    3. Alternatively, do not connect ANX7688 VBUS_CTRL, and at least populate R1300 to connect AXP803 USB-DRVVBUS.
  12. Reorient the transistors for ANX_POWER (PD10) and ANX_RESET (PL9) so they do not invert their input, and (more importantly) produce a low-level output by default. (Since PL9 is already at 1.8V, it may no longer need a transistor.)
  13. Remove the transistors inverting VCONN1_EN and VCONN2_EN, and use a pull-up to DVDD1V8 (that is really already present) instead of the pull-up to 3V3.

Note: Changes 1-7 and 11 are high priority. Changes 12-13 are medium priority. Changes 8-10 are low priority.

* There should be at least one pin where the default value at boot changes, due to being pulled differently, for use in distinguishing the hardware revisions. In v1.1, PL6 reads 0 at boot. Since RI is an active-low interrupt, it needs a pull up. And it doesn't need any level translation. So that's our perfect opportunity. If PL6 reads low at boot, it's a v1.1 device; if PL6 reads high at boot, it's a v1.2 device.

Open Questions

  • What exactly is the modem PWRKEY currently connected to? PB3? STATUS? DCDC1?
  • Currently STATUS pin is connected to PWRKEY and to PB3. STATUS can't be read reliably since voltage divider from R1526 and R1517 places the STATUS signal at 0V or 0.5*Vcc-IO, which is unspecified input value according to A64 datasheet (Vih is 0.7*Vcc-IO, Vil is 0.3*Vcc-IO, the range in between is unspecified).
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