User manual

SPI-4.2 v8.5 Getting Started Guide www.xilinx.com 39
UG154 March 24, 2008
Demonstration Test Bench
R
Lastly, the signal SnkInFrame is created in the status monitor by inverting SnkOof. This
signal is used by the stimulus module to send training. See Appendix C, “Data and Status
Monitor Warnings.”
Customizing the Demonstration Test Bench
The demonstration test bench can be used with default settings or customized to observe
the behavior of the SPI-4.2 core for different configurations.
The demonstration test bench can be programmed to transmit a range of stimuli by
modifying TSCLK_LCK.
• Testcase Package—contains constants used by the testcase module
• Testcase Module—generates data and status
• Sink Calendar Sequence—contains the channel order for the Sink core status
• Source Calendar Sequence—contains the channel order for the Source core status
The following sections describe each module, including customization methods and
resulting behavior. The module descriptions are applicable to both VHDL and Verilog
designs. Language-specific details for VHDL are provided in Appendix A, “VHDL
Details.” Language-specific details and source code showing how to further randomize
input to the SPI-4.2 core for Verilog are provided in Appendix B, “Verilog Details.”
Test Case Package
The test case package contains a list of constants that define the ways that the cores and
demonstration test bench operate. Some of these are user-defined and can be modified,
while others are defined when the core is generated. Table 4-10 provides test bench
constants that can be modified. These constants are modified by regenerating the core in
the CORE Generator system.
Table 4-10: Testcase Package User-Defined Constants
Name
Constant
Type
Default Value
(Range)
Description
SNK_CAL_DATA String snk_calendar.dat
<filename>
Contains the name of the file with the Sink
calendar sequence to be programmed.
SRC_CAL_DATA String src_calendar.dat
<filename>
Contains the name of the file with the Source
calendar sequence to be programmed.
SNK_ALPHA_DATA Integer 3 <0 - 255> Sets the number of repetitions of the 20-word
training pattern sent to the Sink core (0 means
don’t send periodic training).
SNK_DATA_MAX_T Integer 4000 <0-65535> Sets the number of cycles between training
patterns sent to the Sink core (0 means don’t send
periodic training).