add example files

Author: Enayaaa

.gitignore

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+*
+!*.*
+*.hi
+*.o
+*.mif

another_valid.asm

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+// Test program for lab 3
+// Values provided below are in decimal
+
+NOOP
+ADD ACC, M[65]    // ACC = 0 + 7
+SUB ACC, M[66]    // ACC = 7 - 2 = 5
+SB M[67], ACC     // M[67] = 5
+LB ACC, M[73]     // ACC = 245
+NOT ACC           // ACC = 10
+AND ACC, M[67]    // ACC = 10 AND 5 = 0
+NOT ACC           // ACC = NOT ACC = 255
+SBI M[M[68]], ACC // M[M[68]]= M[7] = 255
+LBI ACC, M[M[69]] // ACC = M[M[69]] = M[67] = 5
+ADD ACC, M[71]    // ACC = 5 + M[71] = 5 + 255 = 4 (overflow = 1)
+CMP ACC, M[72]    // ACC = 4, M[72] = 4; --> EQ = 1
+JNE 114           // If NEQ = 1, then jump with offset +115
+IN M[70], IO_BUS  // externalIn (extIn) was set to 7 in the testbench, so that M[70] = 7
+LB ACC, M[70]     // ACC = 7
+CMP ACC, M[65]    // ACC = 7, M[65] = 7; --> EQ = 1, NEQ = 0
+JEQ 1             // If EQ = 1, then jump with offset +2
+SB M[64], ACC     // M[64] = ACC = 7
+JA 128            // Jump to address 129
+SB M[66], ACC    // DM[66] = 7
+//.
+//.
+//.
+JA 128            // Jump for ever

invalid.asm

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+// This is a test file
+
+  // This is a comment
+
+noop
+noop
+NOOP
+add acc, M[-10]     // This should fail
+hello world         // This too

valid.asm

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+// this file explains the contents of memory.mif for lab 4
+// you can use this file when your design does not complete the testbench 
+// to check if every instruction is executed correctly
+
+LB ACC, M[65]        // ACC = M[65]
+ADD ACC, M[64]       // ACC = ACC + M[64]
+DS                   // Display Reg <= ACC
+SB M[65], ACC        // DM[65] = acc
+SUB ACC, M[64]       // ACC = ACC - M[64]
+SB M[64], ACC        // DM[64] = ACC;
+JA 0x00              // JUMP to address 0x00