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84 www.xilinx.com SPI-4.2 Lite v4.3 User Guide
UG181 June 27, 2008
Chapter 4: Designing with the Core
R
Source FIFO Overflow
Figure 4-25 shows the overflow response of the Source FIFO. The assertion of
SrcFFAlmostFull_n indicates that the FIFO is almost full, and that data should no
longer be written into the FIFO. If data continues to be written into the FIFO, it may
overflow and result in data loss. The assertion of SrcFFOverflow_n indicates that an
overflow has occurred and that the current data (along with any subsequent data written
to the FIFO) will be lost. You may resume writing data to the FIFO once
SrcFFAlmostFull_n is deasserted
Figure 4-24: Source FIFO Almost-full Condition
Figure 4-25: Source FIFO Overflow Condition
SrcFFClk
SrcFFWrEn_n
SrcFFAddr
SrcFFData
SrcFFMod
SrcFFSOP
SrcFFEOP
SrcFFErr
SrcFFOverflow_n
SrcFFAlmostFull_n
CH1 CH2
000 000
CH1
SrcFFClk
SrcFFWrEn_n
SrcFFAddr
SrcFFData
SrcFFMod
SrcFFSOP
SrcFFEOP
SrcFFErr
SrcFFOverflow_n
SrcFFAlmostFull_n
CH1
000 000
CH2