Implemented SP, $nnnn and XOR A instructions

2021-02-16 23:05:46 +00:00
parent aa92344d10
commit 237a5f1489
6 changed files with 205 additions and 20 deletions
--- a/rtl/cpu/cpu_pkg.svh
+++ b/rtl/cpu/cpu_pkg.svh
@@ -1,13 +1,49 @@
 package cpu_pkg;

+    //
+    // 4  | ST0_ADDR -> ST1_DEC -> ST2_EXEC -> ST3_NOP
+    // 12 |                    '-> ST2_DEC  -> ST3_DEC -> ST4_EXEC -> .... -> ST11_NOP
+    //
    typedef enum {
        ST0_ADDR,
        ST1_DEC,
        ST2_EXEC,
        ST2_DEC,
-        ST3_INC_ADDR,
        ST3_DEC,
        ST4_EXEC
    } state_t;

+    typedef enum logic [2:0] {
+        REG8_B   = 3'h00,
+        REG8_C   = 3'h01,
+        REG8_D   = 3'h02,
+        REG8_E   = 3'h03,
+        REG8_H   = 3'h04,
+        REG8_L   = 3'h05
+    } reg8_t;
+
+    typedef enum logic [2:0] {
+        ALU_OP_ADD = 3'h00,
+        ALU_OP_ADC = 3'h01,
+        ALU_OP_SUB = 3'h02,
+        ALU_OP_SBC = 3'h03,
+        ALU_OP_AND = 3'h04,
+        ALU_OP_XOR = 3'h05,
+        ALU_OP_OR  = 3'h06,
+        ALU_OP_CP  = 3'h07
+    } alu_op_t;
+
+    typedef enum {
+        OP_SRC_A,
+        OP_SRC_REG8
+    } op_src_t;
+
+    typedef enum {
+        OP_DEST_A
+    } op_dest_t;
+
+    typedef enum {
+        SP_SRC_OPERAND16
+    } sp_src_t;
+
 endpackage