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//////////////////////////////////////////////////////////////////////////////////

// Engineer:       Agner Fog

// 

// Create Date:    2020-06-06

// Last modified:  2021-08-07

// Module Name:    config_r32.vh

// Project Name:   ForwardCom soft core model A

// Target Devices: Artix 7

// Tool Versions:  Vivado v. 2020.1

// License:        CERN-OHL-W v. 2 or later

// Description:    Configuration parameters 

//

// Configuration for 32 bit registers, 32kB data RAM, 64 kB code RAM

//

//////////////////////////////////////////////////////////////////////////////////

`define NUM_VECTOR_UNITS       0       // number of 64-bit vector units or lanes

// Decide if we have 64 bits support. We can use less resources and have higher speed with the 32 bit version. 

// If 32 bits: General purpose registers are 32 bits. Temporary operand buffers are 32 bits.

// Result buses are 32 bits. Results will be 32 bits, even for 64 bit instructions. 

// The data write buses to data cache and code cache are still 64 bits, using any part of the bus for smaller operand sizes.

// If 64 bits: General purpose registers are 64 bits. 64 bit operand size is supported.

// Uncomment this to support 64-bit operand type:

//`define SUPPORT_64BIT

`ifdef SUPPORT_64BIT

    `define RB                    64   // size of general purpose registers, 64 bits

    `define RB1                   63   // index of most significant bit

`else

    `define RB                    32   // size of general purpose registers, 32 bits

    `define RB1                   31   // index of most significant bit

`endif

// number of bits used in mask registers must be TAG_WIDTH < MASKSZ <= RB

// You may experiment with different values here until you chance upon an optimal timing

`define MASKSZ                    18

//`define MASKSZ                    32

//`define MASKSZ                 `RB

// Clock frequency

// Xilinx-specific:

// To change the clock frequency, click on the clock_generator source to open the

// Vivado Clocking Wizard and set the requested output frequency.

// Use the timing summary to check if the design can work with this frequency.

// The frequency defined below must match the frequency set in the clocking wizard: 

`define CLOCK_FREQUENCY   68000000     // max clock frequency for 32-bit version

//`define CLOCK_FREQUENCY   58000000   // max clock frequency for 64-bit version

// Serial input/output BUAD rate. 8 data bits, no parity, 1 stop bit 

//`define BAUD_RATE      19200

`define BAUD_RATE        57600

//`define BAUD_RATE      115200

// serial input  buffer size is 2**IN_BUFFER_SIZE_LOG2 bytes

// serial output buffer size is 2**OUT_BUFFER_SIZE_LOG2 bytes

`define IN_BUFFER_SIZE_LOG2    10      // 1 kbyte

`define OUT_BUFFER_SIZE_LOG2   11      // 2 kbytes

// initial code in 64-bit lines. remember to put the second 32-bit word to the left:

`define LOADER_FILE "loader.mem"       // filename of hex file of machine code for loader

`define MAX_LOADER_SIZE 32'H200        // >= size of loader code, in 32-bit words. Must be even

// Loader entry address is the end of code memory - MAX_LOADER_SIZE

// Restart address is the same address + 1

// code ram address lines. Each line has one 32-bit word = 4 bytes

// code ram size = 2**(CODE_ADDR_WIDTH+2)

//`define CODE_ADDR_WIDTH 13  // 32 kB

`define CODE_ADDR_WIDTH 14  // 64 kB

//`define CODE_ADDR_WIDTH 15  // 128 kB

// data ram address lines. Each line has 1 byte. 

// data ram size = (2**DATA_ADDR_WIDTH)

`define DATA_ADDR_WIDTH 15   // 32 kB

// total address lines for code and data combined, used when writing code. 

// Total address space = (2**COMMON_ADDR_WIDTH) bytes

`define COMMON_ADDR_WIDTH ((`CODE_ADDR_WIDTH+2>`DATA_ADDR_WIDTH) ? `CODE_ADDR_WIDTH+3 : `DATA_ADDR_WIDTH+1)

// The code address space must start immediately after the data address space if IP-addressed data are used without load-time relocation:  

`define CODE_ADDR_START `DATA_ADDR_WIDTH   // code write address starts at 2**`CODE_ADDR_START = end of data address space

// code ram bus width

`define CODE_DATA_WIDTH 64

// The number of entries in the call stack size is 2**CALL_STACK_POINTER_BITS - 1

`define CALL_STACK_POINTER_BITS  10

// number of system registers that behave as g.p. registers (renamed in flight)

`define NUM_SYS_REGISTERS    3

// number of bits in instruction ID tag. 

// The maximum number of instruction tags in flight is 2**TAG_WIDTH - 1  

`define TAG_WIDTH  5

// number of error types distinguished

`define N_ERROR_TYPES  6

// Input/output port numbers

`define INPORT_RS232            8      // input port for RS232 serial input

`define INPORT_RS232_STATUS     9      // input port to read status of RS232 serial input

`define OUTPORT_RS232          10      // output port for RS232 serial output

`define OUTPORT_RS232_STATUS   11      // output port for RS232 serial output status