LFXP3E-5TN100C Lattice, LFXP3E-5TN100C Datasheet - Page 203
LFXP3E-5TN100C
Manufacturer Part Number
LFXP3E-5TN100C
Description
IC FPGA 3.1KLUTS 62I/O 100-TQFP
Manufacturer
Lattice
Datasheet
1.LFXP3C-3T100C.pdf
(397 pages)
Specifications of LFXP3E-5TN100C
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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Figure 9-42. FIFO_DC Without Output Registers, Start of Data Write Cycle
The WrEn signal has to be high to start writing into the FIFO_DC. The Empty and Almost Empty flags are high to
begin and Full and Almost full are low.
When the first data gets written into the FIFO_DC, the Empty flag de-asserts (or goes low), as the FIFO_DC is no
longer empty. In this figure we are assuming that the Almost Empty setting flag setting is 3 (address location 3). So
the Almost Empty flag gets de-asserted when the third address location gets filled.
Now let is assume that we continue to write into the FIFO_DC to fill it. When the FIFO_DC is filled, the Almost Full
and Full Flags are asserted. Figure 9-43 shows the behavior of these flags. In this figure we assume that FIFO_DC
depth is ‘N’.
RPReset
WrClock
RdClock
Almost
Almost
Empty
Empty
Reset
WrEn
RdEn
Data
Full
Full
Q
Invalid Data
Data_1
Data_2
9-38
Invalid Q
Data_3
LatticeECP/EC and LatticeXP Devices
Data_4
Data_5
Memory Usage Guide
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