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68 www.xilinx.com SPI-4.2 Lite v4.3 User Guide
UG181 June 27, 2008
Chapter 4: Designing with the Core
R
FIFO Almost Full Mode “01”
When the FIFO Almost Full Mode (FifoAFMode) is set to “01,” and the Sink core becomes
Almost Full, the Sink interface remains in-frame (SnkOof deasserted), and the Sink Status
logic sends satisfied (“10”) on all channels until SnkAlmostFull_n is deasserted. This is
illustrated in Figure 4-13.
Figure 4-12: FIFO Almost Full Mode “00”
Figure 4-13: FIFO Almost Full Mode “01”
D D
11 11
D D D D D D D DD D DRDat_P
RDClk_P
D
SnkAlmostFull_n
SnkFFClk
00 00 00 00RStat
RSClk
SnkStat
SnkStatClk
00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 11 11 11 11 11 11 11 11 11 11 11
SnkOof
D D D D
00 00 000000 00 00
D D D D D
D D
10 10
D D D D D D D DD D DRDat_P
RDClk_P
D
SnkAlmostFull_n
SnkFFClk
00 00 00 00RStat
RSClk
SnkStat
SnkStatClk
00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 10 10 10 10 10 10 10 10 10 10 10 10
SnkOof
D D D D
00 00 000000 00 00
D D D D