MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
20-51
20.4.5.1
CSI Serialization
Serialization in the CSI configuration is similar to serialization in DSI configuration. The transfer
attributes for SPI frames are determined by the DSPI
x
_CTAR selected by the CTAS field in the SPI
command halfword. The transfer attributes for the DSI frames are determined by the DSPI
x
_CTAR
selected by the DSICTAS field in the DSPI
x
_DSICR.
shows the CSI serialization logic.
Figure 20-32. CSI Serialization Diagram
The parallel inputs signal states are latched into the DSPI
x
_SDR on the rising edge of every system clock
and serialized based on the transfer initiation control settings in the DSPI
x
_DSICR. For more information
on the DSPI
x
Section 20.3.2.11, “DSPI DSI Serialization Data Register (DSPIx_SDR)
.”
SPI frames written to the TX FIFO have priority over DSI data from the DSPI
x
_SDR and are transferred
at the next frame boundary. A copy of the most recently transferred DSI frame is stored in the
DSPI
x
_COMPR. The transfer priority logic selects the source of the serialized data and asserts the
appropriate CS signal.
20.4.5.2
CSI Deserialization
The deserialized frames in CSI configuration go into the DSPI
x
_SDR or the RX FIFO based on the transfer
priority logic. When DSI frames are transferred the returned frames are deserialized and latched into the
DSPI
x
_DDR. When SPI frames are transferred the returned frames are deserialized and written to the RX
FIFO.
shows the CSI deserialization logic.
SOUT
Parallel
DSI Control
Register
DSI Transmit
Comparison Register
Clock
Logic
0 1 • • • • • 15
Shift Register
DSI Serialization
Data Register
Control
Logic
SCK
Inputs
PCSx (SPI)
PCSy (DSI)
16
16
16
16
Transfer
Slave Bus Interface
16
TX FIFO
(P_IN)
Priority Logic
Summary of Contents for MPC5553
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