VHDL Testbench Procedure and Function Calls
The following function call is provided to create data patterns. This returns a data packet whose first
value is set to the seed value and whose subsequent values are incremented by the delta value. If the
delta value is zero, all values are the same. For example:
function
initdata( SEED : INTEGER; DELTA : INTEGER) return PACKET;
A procedure is provided that compares data packets and displays the error when the compare fails. For
example:
procedure ComparePacket( STR : STRING;
EXP : Packet;
GOT : Packet;
LEN : Integer;
ERRCNT : inout INTEGER );
The first parameter is a text string that is printed when a failure occurs, the second parameter is the
expected data, and the third parameter is the actual data. The fourth parameter indicates how many of
the words are to be compared (the packet contains 32 words). Finally, the fifth parameter is a global error
counter that is incremented if a compare fails.
A procedure is provided that displays the received message record structure. This procedure requires
both the message request and output record structures so that it can format the printed data correctly.
For example:
procedure print_msgout( QMSG : TQMSGREQ; Q : TQMSGOUT);
To support general printing, a printf routine is provided that supports printing std_logic, Boolean, integer,
and std_logic_vector types. The syntax is slightly different from the C-language printf function. For
example:
printf("Hello World Decimal %d Hex %x Hex4 %04x Bits %04b A string %s",
fmt(256)&fmt(WORD)&fmt(WORD)&fmt(NIBBLE)&fmt(STRING));
prints
Hello World Decimal 256 Hex 100 Hex4 0100 Bits 1010 A string thestring
Revision 3
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相关PDF资料
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CORR-8BIT-XM-UT2 SITE LICENSE IP CORRELATOR XP
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