Deserial Serial Peripheral Interface (DSPI)
Freescale Semiconductor
25-45
PXR40 Microcontroller Reference Manual, Rev. 1
Figure 25-25. CSI Serialization Diagram
The Parallel Inputs signal states are latched into the DSPI DSI Serialization Data Register (DSPI_SDR)
on the rising edge of every system clock and serialized based on the transfer initiation control settings in
the DSPI_DSICR. When SPI frames are written to the TX FIFO they have priority over DSI data from the
DSPI_SDR and are transferred at the next frame boundary. A copy of the most recently transferred DSI
frame is stored in the DSPI_COMPR. The Transfer Priority Logic selects the source of the serialized data
and asserts the appropriate CS signal.
25.4.5.2
CSI Deserialization
The deserialized frames in CSI Configuration goes into the DSPI_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_DDR. When SPI frames are transferred the returned frames are deserialized and written to
the RX FIFO.
shows the CSI Deserialization logic.
Figure 25-26. CSI Deserialization Diagram
DSI Control
Clock
Logic
Register
Control
Logic
DSI Transmit
Comparison Register
DSI Serialization
Data Register
16
TX FIFO
Parallel
PCSx (SPI)
SOUT
Shift Register
0 1
15
16
16
16
Logic
Priority
Transfer
PCSy (DSI)
Inputs
SCK
(P_IN)
Slave Bus Interface
DSI Deserialization
Data Register
16
RX FIFO
16
16
Parallel
SIN
Shift Register
0 1
15
Control
Logic
16
Logic
Priority
Transfer
Outputs
(P_OUT)
Slave Bus Interface
Summary of Contents for PXR4030
Page 1: ...PXR40 Microcontroller Reference Manual Devices Supported PXR4030 PXR4040 PXR40RM Rev 1 06 2011...
Page 30: ...PXR40 Microcontroller Reference Manual Rev 1 Freescale Semiconductor xxx...
Page 40: ...PXR40 Microcontroller Reference Manual Rev 1 xl Freescale Semiconductor...
Page 66: ...Memory Map PXR40 Microcontroller Reference Manual Rev 1 2 4 Freescale Semiconductor...
Page 120: ...Signal Descriptions 3 54 Freescale Semiconductor PXR40 Microcontroller Reference Manual Rev 1...
Page 860: ...FlexCAN Module 24 50 Freescale Semiconductor PXR40 Microcontroller Reference Manual Rev 1...
Page 1167: ...Decimation Filter Freescale Semiconductor 28 53 PXR40 Microcontroller Reference Manual Rev 1...
Page 1168: ...Decimation Filter 28 54 Freescale Semiconductor PXR40 Microcontroller Reference Manual Rev 1...
