NXP Semiconductors MPC5566 - Multiple Transfer Operation (MTO)

Deserial Serial Peripheral Interface (DSPI)
MPC5566 Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor 20-47
Table 20-22 lists the DSPI D connections.
20.4.4.7 Multiple Transfer Operation (MTO)
In DSI configuration the MTO feature allows for multiple DSPIs within the MCU to be chained together
in a parallel or serial configuration. The parallel chaining allows multiple DSPIs internal to the MCU and
multiple SPI devices external to the MCU to share SCK and PCS signals thereby saving pins. The serial
chaining allows bits from multiple DSPIs to be concatenated into a single DSI frame. MTO is enabled by
setting the MTOE bit in the DSPIx_DSICR.
In parallel and serial chaining there is one bus master and multiple bus slaves. The bus master initiates and
controls the transfers, but the DSPI slaves generate trigger signals for the bus DSPI master when an
internal condition in the slave warrants a transfer. The DSPI slaves also propagate triggers from other
slaves to the master. When a DSPI slave detects a trigger signal on its ht input, the slave generates a trigger
signal on the MTRIG output.
The SIU_DISR must be configured to use serial or parallel chaining.
Table 20-22. DSPI D Connectivity Table
Connected to:
DSPI D
IN[n]
DSPI D
OUT[n]
Connected to:
eTPUA output channel 21 0 0 Input 3 on IMUX for external IRQ
[14]
eTPUA output channel 20 1 1 Input 3 on IMUX for external IRQ[15]
eTPUA output channel 19 2 2 no connect
eTPUA output channel 18 3 3 no connect
eTPUA output channel 17 4 4 Input 3 on IMUX for external IRQ[2]
eTPUA output channel 16 5 5 Input 3 on IMUX for external IRQ[3]
eMIOS output channel 11 6 6 Input 3 on IMUX for external IRQ[4]
eMIOS output channel 10 7 7 Input 3 on IMUX for external IRQ[5]
eMIOS output channel 13 8 8 Input 3 on IMUX for external IRQ[6]
eMIOS output channel 12 9 9 Input 3 on IMUX for external IRQ[7]
eTPUA output channel 29 10 10 Input 3 on IMUX for external IRQ[8]
eTPUA output channel 28 11 11 Input 3 on IMUX for external IRQ[9]
eTPUA output channel 27 12 12 Input 3 on IMUX for external IRQ[10]
eTPUA output channel 26 13 13 Input 3 on IMUX for external IRQ[11]
eTPUA output channel 25 14 14 eMIOS input channel 15,
Input 3 on IMUX for external IRQ
[12]
eTPUA output channel 24 15 15 eMIOS input channel 14,
Input 3 on IMUX for external IRQ[13]