Freescale Semiconductor Qorivva MPC5746R-176DS, User Manual

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EVB configuration
Freescale Semiconductor 5
If stand alone operation is desired, the following power supplies connections should be made on J6 (see
Table 2 ). If using the external supplies option, the user should reference the MPC5746R Data Sheet to
ensure that IDD requirements for each supply are met.
4.3 Clock Configuration Options
The EVB provides three clocking options that are controlled by jumpers:
• On board 20 MHz crystal oscillator
• On board oscillator
• SMA connector for external clock source
Table 3 summarizes the jumper settings for the available clock options. Note that some of these jumpers
are ‘non-populated’ by default and the clock source is configured by default for crystal oscillator
operation.
Table 2. External power input
J6 Description
Pin 1 1.25 V
Pin 2 3.3 V
Pin 3 5 V
Pin 4 GND
Table 3. Jumper Settings - Clock Configuration
Jumpers Selected Clock Source
Reference
Designator
Description
Crystal
(default)
Oscillator SMA
JP2 Shunt to terminate EXTAL with 49.9 ohm resistor to GND Remove Remove Install
JP3 Shunt to connect EXTAL to crystal Install Remove Remove
JP4 Shunt to connect EXTAL to oscillator Remove Install Remove
JP5 Shunt to connect EXTAL to SMA connector Remove Remove Install
JP6 Shunt to connect XTAL to GND Remove Install Install
J10 Oscillator enable Remove Install
1
1
If the oscillator is selected as the clock source, check that J12 (see Table 1 ) is used to select the desired oscillator power.
4.4 Micro Second Channel Connections
The microsecond channel signals on MSC1 are grouped at a SAMTECH ERF-8 connector on the EVB to
provide easier user access. This also allows better trace routing of the differential pair signals. The
connections of MSC1 on the connector are shown in
Figure 2 .
Qorivva MPC5746R-176DS/252DS Evaluation Board (EVB) User’s Guide, Rev. 1. 6
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