NXP Semiconductors MPC5644A, Reference Manual, Page: 1538 / 1735

FlexRay Communication Controller (FlexRay)
MPC5644A Microcontroller Reference Manual, Rev. 6
1538 Freescale Semiconductor
33.6.3.7.1 Receive FIFO configuration data
The CC provides two functional independent receive FIFOs, one per channel. The FIFOs have a common
subset of configuration data:
• Receive FIFO System Memory Base Address Register (FR_RFSYMBADR)
• Receive FIFO Periodic Timer Register (FR_RFPTR)
Each FIFO has its own set of configuration data. The configuration data are located in the following
registers:
• Receive FIFO Watermark and Selection Register (FR_RFWMSR)
• Receive FIFO Start Index Register (FR_RFSIR)
• Receive FIFO Depth and Size Register (RFDSR)
• Receive FIFO Message ID Acceptance Filter Value Register (FR_RFMIDAFVR)
• Receive FIFO Message ID Acceptance Filter Mask Register (FR_RFMIDAFMR)
• Receive FIFO Frame ID Rejection Filter Value Register (FR_RFFIDRFVR)
• Receive FIFO Frame ID Rejection Filter Mask Register (FR_RFFIDRFMR)
• Receive FIFO Range Filter Configuration Register (FR_RFRFCFR)
33.6.3.7.2 Receive FIFO control data
The application can access the FIFOs at any time using the control bits in the following registers:
• Global Interrupt Flag and Enable Register (FR_GIFER)
• Receive FIFO Fill Level and POP Count Register (FR_RFFLPCR)
33.6.3.7.3 Receive FIFO status data
The current status of the receive FIFO is provided in the following register:
• Global Interrupt Flag and Enable Register (FR_GIFER)
• Receive FIFO A Read Index Register (FR_RFARIR)
• Receive FIFO B Read Index Register (FR_RFBRIR)
• Receive FIFO Fill Level and POP Count Register (FR_RFFLPCR)
33.6.4 FlexRay memory area layout
The CC supports a wide range of possible layouts for the FlexRay memory area. Two basic layout modes
can be selected by the FIFO address mode bit FR_MCR[FAM].
33.6.4.1 FlexRay memory area layout (FR_MCR[FAM] = 0)
Figure 33-117 shows an example layout for the FIFO address mode FR_MCR[FAM] = 0. In this mode, the
following set of rules applies to the layout of the FlexRay memory area:
• The FlexRay memory area is one contiguous region.
• The FlexRay memory area size is maximum 64 Kbytes.