ZHCSPJ8B December 2021 – December 2023 AM2732 , AM2732-Q1
PRODUCTION DATA
AM273x bootloader functionality is controlled by a set of start on power (SOP) pins. These pins states are latched on de-assertion of the NRESET pin after power on of the device. The SOP pins are multiplexed with functional mode signals before and during NRESET de-assertion. After bootloader execution the functional mode operation is then restored. See the power on reset timing sequence for more details. The following tables describe the SOP pin operation.
Host hardware should provide a means for driving these SOP pins to their required states during NRESET de-assertion, but also allow for their functional mode operation if required by the intended application.
Pin | SOP Mode Signal Name | Pinlist Signal Name |
---|---|---|
D6 | SOP[0] | TDO |
E17 | SOP[1] | MSS_MIBSPIB_CS2 |
F1 | SOP[2] | PMIC_CLKOUT |
V9 | SOP[3] | MSS_UARTB_TX |
W2 | SOP[4] | MSS_UARTA_TX |
Boot Options | SOP Mode |
---|---|
Bootmode SOP Modes |
|
Crystal Detect SOP Modes |
|
Bootmode SOP Modes | Function | Description |
---|---|---|
SOP_MODE2 | Development Mode | Development boot mode. The AM273x ROM bootloader will setup the device to wait for a JTAG debugger connection. |
SOP_MODE4 | Functional Mode | Functional boot mode of the AM273x device. In this mode, the ROM bootloader will attempt to load a valid secondary bootloader image from primarily the QSPI interface and secondarily the SPI host interface. |
SOP_MODE5 | Device Management Mode | QSPI flash programming boot mode of the AM273x device. In this mode the ROM bootloader will attempt to receive a valid QSPI secondary bootloader image over MSS_UARTA_TX/RX (pins W2, U3) and attempt to flash an attached QSPI memory with this image. |
Crystal Detect SOP Modes | |
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40 MHz Crystal Crystal Mode | ROM bootloader image expects a 40 MHz nominal crystal clock source. |
45.1584 MHz Crystal Mode | ROM bootloader image expects a 45.1584 MHz nominal crystal clock source. |
49.152 MHz Crystal Mode | ROM bootloader image expects a 49.152 MHz nominal crystal clock source. |
50 MHz Crystal Mode | ROM bootloader image expects a 50 MHz nominal crystal clock source. |