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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>