35690

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

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:

Virtex-4 - XtremeDSP for Virtex-4 FPGAs User Guide (UG073)
Virtex-5 - Virtex-5 FPGA XtremeDSP Design Considerations User Guide (UG193)
Virtex-6 - Virtex-6 DSP48E1 Slice, User Guide (UG369)
7-Series - 7-Series FPGA DSP48E1 Slice User Guide (UG479)
Spartan-3A DSP - XtremeDSP DSP48A for Spartan-3A DSP FPGAs User Guide (UG431)
Spartan-6 FPGA - Spartan-6 FPGA DSP48A1 Slice User Guide (UG389)

Master Answer Records

Answer Number	Answer Title	Version Found	Version Resolved
52010	Zynq-7000 AP SoC - Documentation Summary	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 More Virtex-5 LXT Virtex-5 SXT Virtex-5 TXT Virtex-6 CXT Virtex-6 HXT Virtex-6 LX Virtex-6 LXT Virtex-6 SXT Spartan-3A DSP Spartan-6 LX Spartan-6 LXT Artix-7 Kintex-7 Spartan-6Q Virtex-4 FX Virtex-4 LX Virtex-4 QPro/R Virtex-4Q Virtex-4QV Virtex-5Q Virtex-5QV Virtex-6Q Virtex-6QL Virtex-7 Virtex-7 HT Zynq-7000 Less

AR# 35690 DSP48 Slice - Can the DSP48 slice cascades (ACIN, BCIN, PCIN, ACOUT, BCOUT, PCOUT) be connected to fabric?

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AR# 35690 DSP48 Slice - Can the DSP48 slice cascades (ACIN, BCIN, PCIN, ACOUT, BCOUT, PCOUT) be connected to fabric?

Description

Solution

Linked Answer Records

Master Answer Records

Associated Answer Records

Actions