XC3S250E Xilinx, Inc., XC3S250E Datasheet - Page 22

• Manufacturer Part Number: XC3S250E
• Description: Spartan-3E FPGA Family
• Manufacturer: Xilinx, Inc.

Slice Location Designations
The Xilinx development software designates the location of
a slice according to its X and Y coordinates, starting in the
bottom left corner, as shown in
lowed by a number identifies columns of slices, increment-
ing from the left side of the die to the right. The letter ’Y’
followed by a number identifies the position of each slice in
a pair as well as indicating the CLB row, incrementing from
the bottom of the die.
the lower left-hand corner of the die. The SLICEM always
has an even ’X’ number, and the SLICEL always has an odd
’X’ number.
DS312-2 (v1.1) March 21, 2005
Advance Product Specification
SRL16
SRL16
RAM16
RAM16
R
LUT4 (G)
LUT4 (F)
Figure 13
Switch
Matrix
Carry
Carry
Arithmetic Logic
SLICEM
F5MUX
FiMUX
Figure
shows the CLB located in
SHIFTOUT
Figure 13: Arrangement of Slices within the CLB
SHIFTIN
(Logic or Distributed RAM
Left-Hand SLICEM
11. The letter ’X’ fol-
or Shift Register)
CLB
Figure 14: Resources in a Slice
Register
Register
SLICE
SLICE
X0Y1
X0Y0
COUT
CIN
www.xilinx.com
Slice Overview
A slice includes two LUT function generators and two stor-
age elements, along with additional logic, as shown in
Figure
Both SLICEM and SLICEL have the following elements in
common to provide logic, arithmetic, and ROM functions:
•
•
•
•
Right-Hand SLICEL
(Logic Only)
Two 4-input LUT function generators, F and G
Two storage elements
Two wide-function multiplexers, F5MUX and FiMUX
Carry and arithmetic logic
SLICE
SLICE
X1Y1
X1Y0
14.
COUT
LUT4 (G)
LUT4 (F)
CIN
Carry
Carry
Arithmetic Logic
DS099-2_05_082104
F5MUX
FiMUX
to Neighbors
SLICEL
Interconnect
Functional Description
Register
Register
DS312-2_13_020905
15