DADA SOM/DADA Hardware/Power and Reset/Reset scheme and control signals
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Contents
Reset scheme and control signals[edit | edit source]
The AM62x SoC provides several reset signals for its different domains: the following table summarises the TI nomenclature and purpose. Reading "AM62x Processors Technical Reference Manual" [1] is highly recommended.
| SoC signal | SoC domain | Type | Description |
|---|---|---|---|
| MCU_PORz | MCU | Input | MCU Domain cold reset |
| MCU_RESETz | MCU | Input | MCU Domain warm reset |
| RESETz_REQ | Main | Input | Main Domain external warm reset request |
| PORz_OUT | Main | Output | Main Domain POR status output |
| MCU_RESETSTATz | MCU | Output | MCU Domain warm reset status output |
| RESETSTATz | Main | Output | Main Domain warm reset status output |
The following picture instead shows the simplified block diagram of reset scheme and voltage monitoring, referring to the nomenclature of the DADA signals.
The six reset signals of SoC are all usable by the SoM. When designing the SoM pinout, the MCU domain signals were mapped separately, while the Main domain signals were mapped to functions defined in Unica Industrial Dave standard pinout.
See the pinout section for more details on the signals.
Reset signals and their purpose[edit | edit source]
COLD_RESET[edit | edit source]
COLD_RESET is an input signal that cause a SoC cold reset. On SoM the signal is pulled-up with 10 kOhm to VDD_3V3 (3.3 V).
A cold reset of the SoC does not result in a complete power sequence of the SoM.
On Unica Industrial Dave standard pinout it is a always-present type signal i.e. the pin only covers this functionality on any other Industrial SoM.
WARM_RESET[edit | edit source]
WARM_RESET is connected to RESETz_REQ SoC input that starts the main domain warm reset. On SoM the signal is pulled-up with 10 kOhm to VDD_3V3 (3.3 V).
On Unica Industrial Dave standard pinout it is a variable type signal i.e. the pin can assume different functions on other Industrial SoMs.
MCU_RESETz[edit | edit source]
MCU_RESETz is a SoC input (VDD_3V3) that starts the MCU domain warm reset.
On Unica Industrial Dave standard pinout it is a variable type signal i.e. the pin can assume different functions on other Industrial SoMs.
POR_OUT[edit | edit source]
POR_OUT is an open-drain output (a pull-up on a carrier is required) to be used to reset peripherals on carriers. The signal is released by the SoC when it exits reset (either cold or warm main domain reset).
On Unica Industrial Dave standard pinout it is a variable type signal i.e. the pin can assume different functions on other Industrial SoMs.
MCU_RESETSTATz[edit | edit source]
MCU_RESETSTATz is a push-pull (VDD_3V3) SoC output, released by the SoC when it MCU domain exits warm reset.
On Unica Industrial Dave standard pinout it is a variable type signal i.e. the pin can assume different functions on other Industrial SoMs.
PMIC_INT[edit | edit source]
PMIC_INT is a open-drain PMIC output; on SoM the signal is pulled-up with 10 kOhm to VDD_3V3 (3.3 V).
The signal is asserted low in case of PMIC fault condition.
On Unica Industrial Dave standard pinout it is a always-present type signal i.e. the pin only covers this functionality on any other Industrial SoM.
ONOFF[edit | edit source]
Long ONOFF signal retention causes the SoM to turn OFF or ON, with a complete power off/on sequence. This is not intended as a low-power mode, since completely turning off the SoM causes the loss of volatile content such as data in RAM. When the SoM is first powered it turns on without acting on ONOFF signal.
On SoM the signal is pulled-up with 10 kOhm to VIN_SOM (3.3 V).
On Unica Industrial Dave standard pinout it is a variable type signal i.e. the pin can assume different functions on other Industrial SoMs.
SOM_PGOOD[edit | edit source]
SOM_PGOOD is generally used on carrier board to drive loads such as DC/DC enable inputs or switch on/off control signals in order to prevent back power.
Depending on the kind of such loads, SOM_PGOOD might not be able to drive them properly. On DADA SoM this signal is driven by a push-pull output at VIN_SOM (3.3 V) rail, with max 10 mA output current (recommended 1 mA).
On Unica Industrial Dave standard pinout it is a always-present type signal i.e. the pin only covers this functionality on any other Industrial SoM.
JTAG_TRST[edit | edit source]
This signal is connected to the JTAG cell (see JTAG page). With a hardware variant, it is also possible to force a cold reset of the SoC with this signal.
References[edit | edit source]
[1] TI, AM62x Processors Silicon Revision 1.0, Technical Reference Manual
