Xilinx UG154 manual Customizing the Demonstration Test Bench, Test Case Package, Range

Demonstration Test Bench

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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 4-10provides 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	Default Value	Description
	Type	(Range)
SNK_CAL_DATA	String	snk_calendar.dat	Contains the name of the file with the Sink
		<filename>	calendar sequence to be programmed.
SRC_CAL_DATA	String	src_calendar.dat	Contains the name of the file with the Source
		<filename>	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).

SPI-4.2 v8.5 Getting Started Guide www.xilinx.com 39

UG154 March 24, 2008