Phytec phyCORE-OMAP44 Series, Руководство по оборудованию

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Part II: PCM-959/phyCORE-OMAP44xx Carrier Board phyCORE-OMAP44xx
86 ©
PHYTEC Messtechnik GmbH
2012
L-760e_1
2.1.2.2 Switches
The phyCORE-OMAP44xx Carrier Board is populated with some switches which are essential for the operation of
the phyCORE-OMAP44xx module on the carrier board.
Figure 15 shows the location of the switches and push
buttons.
S3 Issues a power on/off event. Pressing this button approx. 2 seconds will toggle the PWRON pin of the
phyCORE-OMAP44xx PMIC device LOW, causing the PMIC to turn on the supply voltages. Pressing this button for
more than 10 seconds causes the PMIC to turn off the supply voltages.
Additionally two DIP-Switches are available at S1 and S2. These DIP-switches allow to change the booting device
order of the OMAP44xx which is predefined by a resistor network on the phyCORE-OMAP44xx. The default
booting device order is 1st: NAND, 2nd: USB, 3rd: UART, 4th: MMC1 (please refer to
Section 2.1.3.17 for more
information).
Note:
The signal levels of the I
2
C and SPI interface are shifted from VCC_1V8_IO (1.8 V) at the phyCORE Connector
to VCC3V3 (3.3 V) by level shifters on the phyCORE Carrier Board.
Ensure that all module connections are not to exceed their expressed maximum voltage or current.
Maximum signal input values are indicated in the corresponding controller User's Manual/Data Sheets.
As damage from improper connections varies according to use and application, it is the user‘s responsibility
to take appropriate safety measures to ensure that the module connections are protected from overloading
through connected peripherals.
Button Description See Chapter
S3 Power button – to power on and off main supply voltages of
the phyCORE-OMAP44xx Section 2.1.3.2.1 and
Section 2.1.3.2.2
S4 Wake-up button – to issue a wake-up signal at pin X1C44
(X_PMIC_PREQ2A) of the phyCORE-OMAP44xx Section 1.4.3.3
S5 Wake-up button – to issue a wake-up signal at pin X1C43
(X_PMIC_PREQ3) of the phyCORE-OMAP44xx Section 1.4.3.3
S7 System Reset Button – system reset signal generation Section 2.1.3.18
Table 38: phyCORE-OMAP44xx Carrier Board Push Buttons Descriptions
Button Description See Chapter
S1 Configuration of pins X_BOOT[0] and X_BOOT[1] Section 2.1.3.17
S2 Configuration of pins X_BOOT[2:5]
Table 39: phyCORE-OMAP44xx Carrier Board DIP-Switch Descriptions