Example MPC5748G DSPI extended mode GHS614

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* Detailed Description:
*
* This example shows how to use SPI module in extended SPI mode
* - DSPI3 is configured as a master
* - SPI1 is configured as a slave
* - Frame size is configured to 32bit
* - Two writes are necessary to load one 32bit frame to TX FIFO
* - For more details about the timing settings see application note AN4830
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* Test HW:         MPC574XG-324DS Rev.A + MPC574XG-MB Rev.C
* MCU:             PPC5748GMMN6A 1N81M
* Fsys:            160 MHz PLL
* Debugger:        Lauterbach Trace32
* Target:          internal_FLASH
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