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TMDSCNCD28P55X: SPI external loopback RX ISR never triggered

Part Number: TMDSCNCD28P55X
Other Parts Discussed in Thread: TMDSHSECDOCK,

Tool/software:

Hi,

I'm trying to run the spi_ex4_external_loopback_fifo_interrupt example where I wire the SPI-A to the SPI-B on the TMDSCNCD28P55X with the TMDSHSECDOCK. 

The example generates the interruption to the TX on the SPI-B but the interruption on the SPI-A is never triggered (spiaRxFIFOISR). 

The wiring was done with:
SPI Peripheral
SPI-A : POCO : GPIO16
SPI-A : POCI :   GPIO17
SPI-A : CLK :     GPIO68
SPI-A : PTE :     GPIO69
SPI Controller
SPI-B : POCO : GPIO60
SPI-B : POCI :   GPIO25
SPI-B : CLK :     GPIO26
SPI-B : PTE :     GPIO27
and the wires were:
SPI-A : POCO <->  SPI-B : POCI 
SPI-A : POCI  <->  SPI-B : POCO
SPI-A : CLK    <->  SPI-B : CLK
SPI-A : PTE    <->  SPI-B : PTE
In the compilation flags I also added the REV_ID=1.
Do you have any idea what the issue can be?
Thanks in advance for your support.