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// ============================================================================

//        __

//   \\__/ o\    (C) 2017-2018  Robert Finch, Waterloo

//    \  __ /    All rights reserved.

//     \/_//     robfinch<remove>@finitron.ca

//       ||

//

//      FT64_config.vh

//

// This source file is free software: you can redistribute it and/or modify 

// it under the terms of the GNU Lesser General Public License as published 

// by the Free Software Foundation, either version 3 of the License, or     

// (at your option) any later version.                                      

//                                                                          

// This source file 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 this program.  If not, see <http://www.gnu.org/licenses/>.    

//

// ============================================================================

//

`define SIM             1'b1

//`define SUPPORT_SMT           1'b1

`define SUPPORT_VECTOR  1'b1

//`define SUPPORT_DCI                   1'b1    // dynamically compressed instructions

//`define DEBUG_LOGIC 1'b1

`define L1_ICACHE_SIZE  4                               // 2 or 4 for 2 or 4 kB

// One way to tweak the size of the core a little bit is to limit the number

// of address bits processed. The test system for instance has only 512MB of

// memory, so the address size is limited to 32 bits.

`define AMSB                    31

`define ABITS                   `AMSB:0

`define QBITS                   3:0                      // bitfield representing a queue entry index

`define QENTRIES        10                      // changing this still requires changing code in FT64.

`define XBITS                   7:0

//`define SUPPORT_DBG           1'b1

// Issue logic is not really required for every possible distance from

// the head of the queue. Later queue entries tend to depend on prior

// ones and hence may not be ready to be issued. Also note that 

// instruction decode takes a cycle making the last entry or two in the

// queue not ready to be issued. Commenting out this line will limit

// much of the issue logic to the first six queue slots relative to the

// head of the queue.

`define FULL_ISSUE_LOGIC        1'b1

// The WAYS config define affects things like the number of ports on the

// register file, the number of ports on the instruction cache, and how

// many entries are contained in the fetch buffers. It also indirectly

// affects how many instructions are queued.

`define WAYS                    2                               // number of ways parallel (1-3 3 not working yet)

`define NUM_IDU         2                               // number of instruction decode units (1-3)

`define NUM_ALU         2                               // number of ALU's (1-2)

`define NUM_MEM         2                               // number of memory queues (1-3)

`define NUM_FPU         2                               // number of floating-point units (0-2)

// Note that even with just a single commit bus, multiple instructions may

// commit if they do not target any registers. Up to three instruction may

// commit even with just a single bus.

`define NUM_CMT         2                               // number of commit busses (1-2)

// Comment out the following to remove FCU enhancements (branch predictor, BTB, RSB)

`define FCU_ENH         1

// Comment out the following to remove bypassing logic on the functional units

`define FU_BYPASS       1

// These are unit availability settings at reset.

`define ID1_AVAIL       1'b1

`define ID2_AVAIL       1'b1

`define ID3_AVAIL 1'b0

`define ALU0_AVAIL      1'b1

`define ALU1_AVAIL      1'b1

`define FPU1_AVAIL      1'b1

`define FPU2_AVAIL      1'b0

`define MEM1_AVAIL      1'b1

`define MEM2_AVAIL      1'b1

`define MEM3_AVAIL      1'b0

`define FCU_AVAIL 1'b1

// Comment out to remove the write buffer from the core.

`define HAS_WB  1'b1

`define WB_DEPTH        8                       // must be one more than desired depth

// Uncomment to allow SIMD operations

`define SIMD    1'b1

// Comment the following to disable registering the output of instruction decoders.

// Inline decoding should not be registered.

`define REGISTER_DECODE         1'b1

//`define INLINE_DECODE         1'b1