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Spartan and Spartan-XL FPGA Families Data Sheet

DS060 (v2.0) March 1, 2013

Product Specification

Product Obsolete/Under Obsolescence

and Spartan-XL families, speeding up arithmetic and count-

ing functions.

The carry chain in 5V Spartan devices can run either up or

down. At the top and bottom of the columns where there are

no CLBs above and below, the carry is propagated to the

right. The default is always to propagate up the column, as

shown in the figures. The carry chain in Spartan-XL devices

can only run up the column, providing even higher speed.

Figure 16, page 18 shows a Spartan/XL FPGA CLB with

dedicated fast carry logic. The carry logic shares operand

and control inputs with the function generators. The carry

outputs connect to the function generators, where they are

combined with the operands to form the sums.

Figure 17, page 19 shows the details of the Spartan/XL

FPGA carry logic. This diagram shows the contents of the

box labeled "CARRY LOGIC" in Figure 16.

The fast carry logic can be accessed by placing special

library symbols, or by using Xilinx Relationally Placed Mac-

ros (RPMs) that already include these symbols.

相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
XCS30-4VQ100I	制造商:XILINX 制造商全稱:XILINX 功能描述:Spartan and Spartan-XL Families Field Programmable Gate Arrays
XCS30-4VQ144C	制造商:XILINX 制造商全稱:XILINX 功能描述:Spartan and Spartan-XL Families Field Programmable Gate Arrays
XCS30-4VQ144I	制造商:XILINX 制造商全稱:XILINX 功能描述:Spartan and Spartan-XL Families Field Programmable Gate Arrays
XCS30-4VQ208C	制造商:XILINX 制造商全稱:XILINX 功能描述:Spartan and Spartan-XL Families Field Programmable Gate Arrays
XCS30-4VQ208I	制造商:XILINX 制造商全稱:XILINX 功能描述:Spartan and Spartan-XL Families Field Programmable Gate Arrays

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