Slice Description - Xilinx Virtex-5 FPGA User Manual

Chapter 5: Configurable Logic Blocks (CLBs)
X-Ref Target - Figure 5-2

Slice Description

Every slice contains four logic-function generators (or look-up tables), four storage
elements, wide-function multiplexers, and carry logic. These elements are used by all slices
to provide logic, arithmetic, and ROM functions. In addition to this, some slices support
two additional functions: storing data using distributed RAM and shifting data with 32-bit
registers. Slices that support these additional functions are called SLICEM; others are
called SLICEL. SLICEM (shown in
connections found in all slices. SLICEL is shown in
174
COUT COUT
CLB
X1Y1
Slice
X0Y1
CIN
COUT
CLB
X1Y0
Slice
X0Y0
Figure 5-2: Row and Column Relationship between CLBs and Slices
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COUT
CLB
Slice
Slice
X2Y1
CIN CIN
COUT COUT
CLB
Slice
Slice
X2Y0
Figure 5-3) represents a superset of elements and
Figure 5-4.
COUT
Slice
X3Y1
CIN
COUT
Slice
X3Y0
UG190_5_02_122605
Virtex-5 FPGA User Guide
UG190 (v5.0) June 19, 2009