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AR# 35690

DSP48 Slice - Can the DSP48 slice cascades (ACIN, BCIN, PCIN, ACOUT, BCOUT, PCOUT) be connected to fabric?

Description

Can the DSP48 slice cascades (ACIN, BCIN, PCIN, ACOUT, BCOUT, PCOUT) be connected to fabric?

Solution

Dedicated cascade routes cannot be accessedin fabric.They cannot be connected to constant values or FPGA fabric, such as LUTs for flip-flops. The dedicated routes can only be connected between adjacent DSP48 slices.

  • The ACIN input can only be connected to ACOUT of an adjacent DSP48 slice.
  • The BCIN input can only be connected to BCOUT of an adjacent DSP48 slice.
  • The PCIN input can only be connected to PCOUT of an adjacent DSP48 slice.

Unused input cascade pins should be tied to '0' so that the tools will know that they are unused.Unused output cascade pins should be left unconnected so that the tools will know that they are not being used.

For more details on how to connect up the PCIN input, see (Xilinx Answer 44205). For more information on a particular DSP48 slice, please see the appropriate product DSP48 slice device userguide:

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
52010 Zynq-7000 AP SoC - Documentation N/A N/A

Associated Answer Records

Answer Number Answer Title Version Found Version Resolved
44205 DSP48 Slice - How do I connect up the PCIN when it is not connected to the PCOUT of an adjacent DSP48 slice? N/A N/A
AR# 35690
Date Created 09/23/2011
Last Updated 12/15/2012
Status Active
Type General Article
Devices
  • Virtex-4 SX
  • Virtex-5 FXT
  • Virtex-5 LX
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  • Virtex-5 LXT
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  • Virtex-6 SXT
  • Spartan-3A DSP
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  • Artix-7
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  • Virtex-4 FX
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  • Virtex-4 QPro/R
  • Virtex-4Q
  • Virtex-4QV
  • Virtex-5Q
  • Virtex-5QV
  • Virtex-6Q
  • Virtex-6QL
  • Virtex-7
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  • Zynq-7000
  • Less