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add the 9x block (needs work)
This commit is contained in:
Raphael Jacquot 2019-02-20 09:18:40 +01:00
parent 62a1624846
commit 1e136010c9
2 changed files with 99 additions and 5 deletions
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70
saturn_decoder.v
View file

@ -1,3 +1,23 @@
/*
(c) Raphaël Jacquot 2019
This file is part of hp_saturn.
hp_saturn is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
any later version.
hp_saturn is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Foobar. If not, see <https://www.gnu.org/licenses/>.
*/
/******************************************************************************
*
* Instruction decoder module
@ -33,6 +53,7 @@ module saturn_decoder(
o_ins_set_mode, o_mode_dec,
o_ins_alu_op, o_ins_test_go,
o_ins_reset, o_ins_config,
o_ins_mem_xfr, o_xfr_dir_out,
o_dbg_nibbles, o_dbg_nb_nbls, o_mem_load, o_mem_pos
);
@ -97,6 +118,8 @@ output reg [0:0] o_ins_test_go;
// bus operations
output reg [0:0] o_ins_reset;
output reg [0:0] o_ins_config;
output reg [0:0] o_ins_mem_xfr;
output reg [0:0] o_xfr_dir_out;
/* data used by the debugger
*
@ -191,6 +214,8 @@ always @(posedge i_clk) begin
o_ins_set_mode <= 0;
o_ins_reset <= 0;
o_ins_config <= 0;
o_ins_mem_xfr <= 0;
o_xfr_dir_out <= 0;
o_test_carry <= 0;
end
@ -261,6 +286,8 @@ always @(posedge i_clk) begin
$display("cleanup instruction modes");
o_ins_reset <= 0;
o_ins_config <= 0;
o_ins_mem_xfr <= 0;
o_xfr_dir_out <= 0;
// counters for debugger info
o_dbg_nb_nbls <= 1;
@ -315,6 +342,13 @@ always @(posedge i_clk) begin
`endif
end
4'h8: block_8x <= 1;
4'h9: begin
go_fields_table <= 1;
// we don't know, safe bet is table a, but could be table b,
// works either way, table is fixed on the next nibble
o_fields_table <= `FT_TABLE_a;
block_9x <= 1;
end
4'hA: begin
go_fields_table <= 1;
// we don't know, safe bet is table a, but could be table b,
@ -530,6 +564,10 @@ always @(posedge i_clk) begin
o_alu_no_stall <= !use_fields_tbl && i_nibble[1];
// o_alu_debug <= i_nibble[1];
// set the info about this being a memory transfer
o_ins_mem_xfr <= 1;
o_xfr_dir_out <= !i_nibble[1];
block_15xx <= use_fields_tbl;
o_ins_alu_op <= !(use_fields_tbl);
@ -583,6 +621,38 @@ always @(posedge i_clk) begin
`include "saturn_decoder_block_8.v"
/*
* Block 9xx
*
*
*/
if (do_block_9x) begin
`ifdef SIM
$display("block_9x %h", i_nibble);
`endif
o_fields_table <= i_nibble[3]?`FT_TABLE_b:`FT_TABLE_a;
block_9ax <= !i_nibble[3];
block_9bx <= i_nibble[3];
block_9x <= 0;
end
if (do_block_9ax) begin
`ifdef SIM
$display("block_9ax %h", i_nibble);
`endif
o_dec_error <= 1;
block_9ax <= 0;
end
if (do_block_9bx) begin
`ifdef SIM
$display("block_9bx %h", i_nibble);
`endif
o_dec_error <= 1;
block_9bx <= 0;
end
/*
* Block Axx
* ra=ra+rb a

34
saturn_decoder_block_vars.v
View file

@ -1,9 +1,21 @@
/*
*
*
*
*
(c) Raphaël Jacquot 2019
This file is part of hp_saturn.
hp_saturn is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
any later version.
hp_saturn is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Foobar. If not, see <https://www.gnu.org/licenses/>.
*/
`ifndef _SATURN_DECODER_BLOCK_VARS
@ -123,6 +135,18 @@ wire do_block_jump_test2;
assign do_block_jump_test = do_on_other_nibbles && block_jump_test;
assign do_block_jump_test2 = do_on_other_nibbles && block_jump_test2;
reg block_9x;
wire do_block_9x;
assign do_block_9x = do_on_other_nibbles && block_9x;
reg block_9ax;
wire do_block_9ax;
assign do_block_9ax = do_on_other_nibbles && block_9ax;
reg block_9bx;
wire do_block_9bx;
assign do_block_9bx = do_on_other_nibbles && block_9bx;
reg block_Ax;
wire do_block_Ax;
assign do_block_Ax = do_on_other_nibbles && block_Ax;