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AR# 21942

7.1i IP Update 3 CORE Generator, IP-DSP - What's New and Known Issues List


Keywords: ISE, Binary Counter, Comparator, Complex Multiplier, Distributed Arithmetic FIR Filter, DVB S2 FEC Encoder, FFT, Floating-point, MAC, MACC, Pipelined Divider, RAM-based Shift Register, TCC Encoder 3GPP, LogiCORE

This Answer Record contains the IP-DSP "What's New and Known Issues" addressed in the 7.1i IP Update 3.




DVB S2 FED Encoder v1.1
New Features in v1.1
- Modified CTS behavior for improved data flow in core
- Added timing diagrams to data sheet

Fast Fourier Transform (xFFT) v3.2
Features in v3.2:
- Support added for Spartan-3E
- "Optimize for Speed using Xtreme DSP Slices" option added to all three architectures. This option in Virtex-4 enables operation of the core at higher clock speeds by using more DSP48s. This provides another way to make trade-offs between resource utilization and performance.
- "Bit/Digit Reversed Order" or "Natural Order" output available for all three architectures
- "Input Data Width" and "Phase Factor Width" expanded to include all values from 8 to 24
- "Run Time Configurable Transform Length" available for all three architectures
- "Distributed RAM Memory Option" available for Data for Radix-4 Burst I/O as well as Radix-2 Minimum Resources

Bug Fixes in v3.2:
- CR 199541: Incorrect FFT output results for Radix-4 Burst I/O when using Virtex-4
- CR 201500: Core will not generate for these two cases:
-- When either the Radix-4 Burst I/O or Radix-2 Minimum Resources architectures are selected and output width = 35 bits with phase factor width = 20 or 24 bits
-- When the Pipelined Streaming I/O architecture is selected and output width > 35 bits with phase factor width = 20 or 24 bits
- CR 201885: If either Radix-4 Burst I/O or Radix-2 Minimum Resources are selected, the core will not begin processing after the initial triggering of START unless SCLR is asserted first
- CR 207964: Maximum clock speed numbers in data sheet v3.1 have been corrected in v3.2
- CR 209462: VHDL and Verilog Structural Behavioral models give incorrect results



LogiCORE Binary Counter v8.0
- Mismatch between behavioral and timing simulation on the THRES0 output. See (Xilinx Answer 21411).
- Mismatch between behavioral and timing simulation on the Q output. See (Xilinx Answer 21412).
- Binary Counter does not generate when I enter the data in Hex and step size of greater than 10. See (Xilinx Answer 21413).
- Binary Counter does not have a Verilog Simulation Model. See (Xilinx Answer 21983).

LogiCORE Complex Multiplier v2.1
- Spartan-3E support for the Complex Multiplier. See (Xilinx Answer 21467).

LogiCORE Distributed Arithmetic FIR Filter (DA FIR) v9.0
- CORE Generator memory consumption issues occur with the DA FIR. See (Xilinx Answer 18663).
- Half-band output width behavioral model does not match the netlist output width. See (Xilinx Answer 21414).
- In the GUI, an error that reports an invalid parameter in the COE file is displayed in a different base format. See (Xilinx Answer 14202).
- Interpolating half-band fails to check for zeros in coefficients. See (Xilinx Answer 20840).

LogiCORE Fast Fourier Transform (xFFT) v3.1
- Virtex-4 speed numbers in the data sheet are incorrect. See (Xilinx Answer 21453).

LogiCORE Fast Fourier Transform (xFFT) v3.2
- Large FFT point size generation times. See (Xilinx Answer 21988).

LogiCORE MAC v4.0
- Virtex-4 max number of cycles. See (Xilinx Answer 21511).

LogiCORE Pipelined Divider v3.0
- How to perform a Verilog Behavioral Simulation. See (Xilinx Answer 20615).

LogiCORE RAM-based Shift Register v8.0
- Large RAM-based Shift Registers fail to generate. See (Xilinx Answer 21410).



LogiCORE CIC v3.0
- The CIC v3.0 filter exhibits overflow for inputs that use the complete dynamic bit range of the data input. See (Xilinx Answer 12480).

- Output does not change when the output width is larger than 12 bits. See (Xilinx Answer 20371).

- Information for converting from floating-point to fixed-point coefficients for Xilinx DA FIR and MAC FIR filters. See (Xilinx Answer 5366).

LogiCORE DDC v1.0, MAC FIR v5.0
- In the GUI, an error that reports an invalid parameter in the COE file is displayed in a different base format. See (Xilinx Answer 14202).

LogiCORE DCT v2.1
- DCT can be implemented in the Spartan-3 and Virtex-4 devices. See (Xilinx Answer 18937).

LogiCORE DCT v2.1
- DCT output width is incorrectly calculated, causing Java errors. See (Xilinx Answer 20459).

LogiCORE DDS v5.0
- DDS Data Sheet has an obsolete web link. See (Xilinx Answer 21397).

LogiCORE DDS v5.0
- DDS channel output does not operate as expected. See (Xilinx Answer 21474).

LogiCORE 1024-pt FFTv1.0
- The block RAM configurations in the FFT/IFFT Data Sheet do not match the hardware configurations. See (Xilinx Answer 15311).

LogiCORE 16-pt FFT v2.0
- The slice utilization of a 16-point Virtex FFT is greater than that of a 64-point FFT. See (Xilinx Answer 8765).

LogiCORE 256-pt FFT v2.0
- The FFT for a Virtex-II device causes PAR warnings and errors. See (Xilinx Answer 13173).

LogiCORE 32-pt FFT v1.0
- No Verilog model is available for the FFT Core. See (Xilinx Answer 11155).

LogiCORE 64-pt FFT v2.0
- The RESULT signal is not reset properly in the 64-point FFT v2.0. See (Xilinx Answer 15383).

- Simulation of all fixed netlist FFT (64, 256, 1024) cores generates many warnings. See (Xilinx Answer 14861).
- Information on output connections to the fixed netlist FFT (64, 256, 1024) cores during a write operation to RAM X (TMS configuration). See (Xilinx Answer 9288).

- Information on support for multiple MAC FIRs with different COE files in the same project. See (Xilinx Answer 16433).
- Back-annotated Verilog simulation causes memory collision errors. See (Xilinx Answer 16106).

LogiCORE Reed Solomon v5.0
- Information on the Ghost Enable pin in the GUI. See (Xilinx Answer 19526).
- Processing delay warning for 2 Channel Reed Solomon. See (Xilinx Answer 21769).

LogiCORE 3GPP Turbo Convolutional Decoder (TCC Decoder 3GPP) v1.0
- SDF constructs error in timing (post-PAR) simulation, when using ModelSim. See (Xilinx Answer 21434).
AR# 21942
Date Created 09/04/2007
Last Updated 03/30/2009
Status Archive
Type General Article