This bit is reserved and
always returns ‘0’ when read.
Bit 6 – Reserved
Bit
This bit is reserved and
always returns ‘0’ when read.
Bits 5:0 – DFWP[5:0] Data FIFO Write
Pointer Register
This register gives read and
write access to the data FIFO write pointer (WrPtr). The manipulation of the WrPtr
requires thorough knowledge of the internal functionality of the FIFO. To avoid
unpredictable behavior, the WrPtr must only be changed in IDLEMode. The WrPtr can
have values between 0 and 63. The pointer cycles through these values in a round
robin manner. The difference between WrPtr and RdPtr (WrPtr – RdPtr) must never
exceed the FIFO depth, because otherwise the FIFO will be in an undefined state.
This can be checked by reading the fill level in the DFL.DFFLS register. If the
value is larger than 32, the RdPtr or WrPtr value is invalid. Writing to this
register overrides any other access.
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