HW-SPAR3E-SK-US-G Xilinx Inc, HW-SPAR3E-SK-US-G Datasheet - Page 31
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HW-SPAR3E-SK-US-G
Manufacturer Part Number
HW-SPAR3E-SK-US-G
Description
KIT STARTER SPARTAN-3E
Manufacturer
Xilinx Inc
Specifications of HW-SPAR3E-SK-US-G
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
122-1507
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The MULT_AND is useful for small multipliers. Larger multi-
pliers can be built using the dedicated 18x18 multiplier
blocks (see
Storage Elements
The storage element, which is programmable as either a
D-type flip-flop or a level-sensitive transparent latch, pro-
vides a means for synchronizing data to a clock signal,
among other uses. The storage elements in the top and bot-
Table 15: Storage Element Signals
The control inputs R, S, CE, and C are all shared between
the two flip-flops in a slice.
DS312-2 (v3.8) August 26, 2009
Product Specification
Figure 25: FD Flip-Flop Component with Synchronous
D
Q
C
G
CE
GE
S
R
PRE
CLR
SR
REV
Signal
Input. For a flip-flop data on the D input is loaded when R and S (or CLR and PRE) are Low and CE is High
during the Low-to-High clock transition. For a latch, Q reflects the D input while the gate (G) input and gate
enable (GE) are High and R and S (or CLR and PRE) are Low. The data on the D input during the High-to-Low
gate transition is stored in the latch. The data on the Q output of the latch remains unchanged as long as G or
GE remains Low.
Output. Toggles after the Low-to-High clock transition for a flip-flop and immediately for a latch.
Clock for edge-triggered flip-flops.
Gate for level-sensitive latches.
Clock Enable for flip-flops.
Gate Enable for latches.
Synchronous Set (Q = High). When the S input is High and R is Low, the flip-flop is set, output High, during the
Low-to-High clock (C) transition. A latch output is immediately set, output High.
Synchronous Reset (Q = Low); has precedence over Set.
Asynchronous Preset (Q = High). When the PRE input is High and CLR is Low, the flip-flop is set, output High,
during the Low-to-High clock (C) transition. A latch output is immediately set, output High.
Asynchronous Clear (Q = Low); has precedence over Preset to reset Q output Low
CLB input for R, S, CLR, or PRE
CLB input for opposite of SR. Must be asynchronous or synchronous to match SR.
Dedicated
R
Reset, Set, and Clock Enable
CE
D
C
R
S
Multipliers).
FDRSE
DS312-2_40_021305
Q
www.xilinx.com
Description
tom portions of the slice are called FFY and FFX, respec-
tively. FFY has a fixed multiplexer on the D input selecting
either the combinatorial output Y or the bypass signal BY.
FFX selects between the combinatorial output X or the
bypass signal BX.
The functionality of a slice storage element is identical to
that described earlier for the I/O storage elements. All sig-
nals have programmable polarity; the default active-High
function is described.
Table 16: FD Flip-Flop Functionality with Synchronous
Reset, Set, and Clock Enable
R
1
0
0
0
0
S
X
1
0
0
0
Inputs
CE
X
X
0
1
1
D
X
X
X
1
0
↑
↑
↑
↑
C
X
Functional Description
No Change
Outputs
Q
0
1
1
0
31
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