Information

46.4.7.3 FIFO error flag
The transmit FIFO error flag is set when the any of the enabled transmit FIFOs
underflow. After it is set, all enabled transmit channels repeat the last valid word read
from the transmit FIFO until TCSR[FEF] is cleared and the next transmit frame starts.
All enabled transmit FIFOs must be reset and initialized with new data before
TCSR[FEF] is cleared.
RCSR[FEF] is set when the any of the enabled receive FIFOs overflow. After it is set, all
enabled receive channels discard received data until RCSR[FEF] is cleared and the next
next receive frame starts. All enabled receive FIFOs should be emptied before
RCSR[FEF] is cleared.
The FIFO error flag can generate only an interrupt.
46.4.7.4 Sync error flag
The sync error flag, TCSR[SEF] or RCSR[SEF], is set when configured for an externally
generated frame sync and the external frame sync asserts when the transmitter or receiver
is busy with the previous frame. The external frame sync assertion is ignored and the
sync error flag is set. When the sync error flag is set, the transmitter or receiver continues
checking for frame sync assertion when idle or at the end of each frame.
The sync error flag can generate an interrupt only.
46.4.7.5 Word start flag
The word start flag is set at the start of the second bit clock for the selected word, as
configured by the Word Flag register field.
The word start flag can generate an interrupt only.
Data FIFO
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
1176 Freescale Semiconductor, Inc.