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[/] [ao486/] [trunk/] [rtl/] [ao486/] [commands/] [CMD_LxS.txt] - Rev 2

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<defines>
`define CMD_LxS         #AUTOGEN_NEXT_CMD
// glob_param_2        --> new reg value

`define CMDEX_LxS_STEP_1        4'd0
`define CMDEX_LxS_STEP_2        4'd1
`define CMDEX_LxS_STEP_3        4'd2
`define CMDEX_LxS_STEP_LAST     4'd3
</defines>

<decode>
(dec_ready_modregrm_one && (decoder[7:0] == 8'hC4 || decoder[7:0] == 8'hC5)) || (dec_ready_2byte_modregrm && (decoder[7:0] == 8'hB2 || decoder[7:0] == 8'hB4 || decoder[7:0] == 8'hB5))
prefix_group_1_lock || `DEC_MODREGRM_IS_MOD_11
`CMD_LxS
SET(dec_cmdex, `CMDEX_LxS_STEP_1);
SET(consume_modregrm_one);
SET(dec_is_complex);
</decode>

<microcode>
`CMDEX_LxS_STEP_1
`CMDEX_LxS_STEP_2
`CMDEX_LxS_STEP_3
CALL(`CMDEX_load_seg_STEP_1);
LOOP(`CMDEX_LxS_STEP_LAST);
</microcode>

<read>
IF(rd_cmd == `CMD_LxS && rd_cmdex == `CMDEX_LxS_STEP_1);
            
    IF(~(rd_address_effective_ready) || rd_mutex_busy_memory); SET(rd_waiting);
    ELSE();
        
        IF(rd_operand_16bit);
            SET(rd_glob_param_2_set);
            SET(rd_glob_param_2_value, read_4);
        
            SET(read_virtual);

            IF(~(read_for_rd_ready)); SET(rd_waiting); ENDIF();
        ENDIF();
    ENDIF();
ENDIF();
</read>

<read>
IF(rd_cmd == `CMD_LxS && rd_cmdex == `CMDEX_LxS_STEP_2);
    
    SET(address_ea_buffer);

    IF(rd_operand_32bit);
        
        SET(read_length_word);
    
        SET(rd_glob_param_1_set);
        SET(rd_glob_param_1_value, { 13'd0, rd_decoder[4] & rd_decoder[2], (rd_decoder[6] & rd_decoder[0]) | rd_decoder[1], rd_decoder[0], read_4[15:0] });

        SET(read_virtual);

        IF(~(read_for_rd_ready)); SET(rd_waiting); ENDIF();

    ENDIF();
ENDIF();
</read>


<read>
IF(rd_cmd == `CMD_LxS && rd_cmdex == `CMDEX_LxS_STEP_3);
            
    IF(rd_operand_16bit);
        SET(address_ea_buffer);
        
        SET(rd_glob_param_1_set);
        SET(rd_glob_param_1_value, { 13'd0, rd_decoder[4] & rd_decoder[2], (rd_decoder[6] & rd_decoder[0]) | rd_decoder[1], rd_decoder[0], read_4[15:0] });
    ELSE();
        SET(rd_glob_param_2_set);
        SET(rd_glob_param_2_value, read_4);
    ENDIF();
    
    SET(read_virtual);

    IF(~(read_for_rd_ready)); SET(rd_waiting); ENDIF();
ENDIF();
</read>

<read>
IF(rd_cmd == `CMD_LxS && rd_cmdex == `CMDEX_LxS_STEP_LAST);
    SET(rd_dst_is_reg);
    
    SET(rd_req_reg);
ENDIF();
</read>

<execute>
IF(exe_cmd == `CMD_LxS);
    SET(exe_result, glob_param_2);
ENDIF();
</execute>

<write>
IF(wr_cmd == `CMD_LxS && wr_cmdex != `CMDEX_LxS_STEP_LAST);
    SET(wr_not_finished);
ENDIF();
</write>

<write>
IF(wr_cmd == `CMD_LxS && wr_cmdex == `CMDEX_LxS_STEP_LAST);
    
    SET(write_regrm);
    
    // clear pipeline
    SET(wr_req_reset_micro);
    SET(wr_req_reset_rd);
    SET(wr_req_reset_exe);
ENDIF();
</write>

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