DS589 Datasheet, PDF (4/6 Pages) Xilinx, Inc – Virtex-5 FPGA CRC Wizard v1.3

Virtex-5 FPGA CRC Wizard v1.3
Core Parameters
Table 1 shows the core parameters, description, and CRC Wizard value.
Table 1: Core Parameters
Parameter
Description
CRC_Init
The initial value to be loaded to the internal CRC registers for CRC
calculation.
Data_Width
Input data width from the user interface to CRC interface.
CompData
Some protocols specify that each data byte should be
complemented before passing through the CRC calculator. This
option permits implementation of this feature.
TranData
When selected, each RX/TX_DATA byte is transposed before it is
passed through the CRC calculator.
CompCRC
Protocols such as Ethernet and Fibre Channel require a final
complementing of each of the CRC bytes. This option permits
implementation of this feature.
TranCRC
When selected, each byte output from the CRC generator is
transposed.
CRC Wizard Value
32-bit value field
32-bit/64-bit
TRUE/FALSE
TRUE/FALSE
TRUE/FALSE
TRUE/FALSE
Core Interface
The interface includes all ports required to read and write framed data to and from the CRC integrated
block. LocalLink ports with a framing interface are provided. The interface consists of a simple set of
data ports with source and destination ready ports. The generated core instantiates two CRC blocks
depending on the width selected and includes LocalLink ports for both instances.
Resource Utilization
The number of look-up tables (LUTs) and flip-flops (FFs) used in selected CRC designs are shown in
Table 2 (for VHDL) and Table 3 (for Verilog). The CRC design core is also available in configurations
not shown in the tables; the estimated cost for these modules can be extrapolated from the tables. The
implementation shown uses the example design and is for illustration purposes only.
Table 2: Virtex-5 VHDL Implementation Resource Utilization
Design Configuration
CRC Width
32
CRC with variable REM support
64
CRC with variable REM support + Transpose CRC
32
Data + Complement CRC Data
64
Resources Used
LUTs
FFs
266
406
492
674
330
406
637
674
4
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DS589 March 24, 2008
Product Specification