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fix program2

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This commit is contained in:
Arthur Lu
2022-08-17 19:01:43 -07:00
parent 9a8c9a3771
commit 570bd3698a
3 changed files with 19 additions and 16 deletions
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2
RTL/program1_tb.sv
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@@ -44,7 +44,7 @@ module program1_tb ();
assign LFSR_ptrn[8] = 8'h7B;
always_comb begin
pt_no = $random;
pt_no = $urandom_range(0, 8);
if(pt_no>8) pt_no[3] = 0; // restrict pt_no to 0 through 8
lfsr_ptrn = LFSR_ptrn[pt_no]; // look up and engage the selected pattern; to data_mem[62]
end

15
RTL/program2_tb.sv
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@@ -22,8 +22,8 @@ module program2_tb () ;
// note in practice your design should be able to handle ANY ASCII string that is
// restricted to characters between space (0x20) and script f (0x9f) and shorter than
// 55 characters in length
string str1 = "Mr. Watson, come here. I want to see you."; // sample program 1 input
// string str1 = " Knowledge comes, but wisdom lingers. "; // alternative inputs
string str1 = "Knowledge comes, but wisdom lingers"; // sample program 1 input
// string str1 = " . "; // alternative inputs
// string str1 = " 01234546789abcdefghijklmnopqrstuvwxyz. "; // (make up your own,
// string str1 = " f A joke is a very serious thing."; // as well)
// string str1 = " Ajok "; //
@@ -46,13 +46,14 @@ module program2_tb () ;
assign LFSR_ptrn[7] = 7'h7E;
assign LFSR_ptrn[8] = 7'h7B;
always_comb begin
pt_no = 0; //$random>>22; // or pick a specific one
if(pt_no>8) pt_no[3] = 0; // restrict to 0 through 8 (our legal patterns)
lfsr_ptrn = LFSR_ptrn[pt_no]; // engage the selected pattern
end
pt_no = 4;
//pt_no = $urandom_range(0, 8);
if(pt_no>8) pt_no[3] = 0; // restrict pt_no to 0 through 8
lfsr_ptrn = LFSR_ptrn[pt_no]; // look up and engage the selected pattern; to data_mem[62]
end
// now select a starting LFSR state -- any nonzero value will do
always_comb begin
LFSR_init = 'b1;//$random>>2; // or set a value, such as 7'b1, for debug
LFSR_init = $urandom;//$random>>2; // or set a value, such as 7'b1, for debug
if(!LFSR_init) LFSR_init = 7'b1; // prevents illegal starting state = 7'b0;
end