end
// Connect up the processor
- PROCESSOR cpu(.clk(counter[`SCALING]),
+ PROCESSOR cpu(.clk(CLK),
.led(LED),
.uart_tx(UART_TX),
.uart_rx(UART_RX));
`include "gcram.v"
-module GC (input clk, input clk_enable, input rst, input [15:0] Ein, output [15:0] Eout, input [3:0] gcop, output [5:0] ostate, output conn_et, output conn_ea, output step_eval, output ram_we, output [12:0] ram_addr, output [15:0] ram_di, input [15:0] ram_do);
+module GC (input clk, input clk_enable, input rst, input [15:0] Ein, output [15:0] Eout, input [3:0] gcop, output [5:0] ostate, output conn_et, output conn_ea, output step_eval, output ram_we, output [12:0] ram_addr, output [15:0] ram_di, input [15:0] ram_do, output [12:0] Pout);
reg [15:0] rom_output;
reg [5:0] gostate;
reg [5:0] gnstate;
reg [12:0] A; // latched address
+ assign Pout = P;
assign ram_addr = A;
assign ram_di = S;
module GCRAM
-(input clk, input we, input[12:0] addr, input[15:0] di, output reg [15:0] do, output reg [15:0] result);
+(input clk, input we, input[12:0] addr, input[15:0] di, output reg [15:0] do);
reg [15:0] mem [255:0];
always @ (posedge clk)
if (we)
mem[addr] <= #1 di;
- always @ (posedge clk)
- result <= mem[6];
-
initial begin
mem[ 0] <= 0; // (cdr part of NIL)
mem[ 1] <= 0; // (car part of NIL)
`ifdef SIM
`define UART_DIVIDE 1
`else
- `define UART_DIVIDE 39
+ `define UART_DIVIDE 625
`endif
module PROCESSOR (input clk, output [4:0] led, output uart_tx, input uart_rx);
wire gc_clock_enable = counter[0] & counter[1] & !reset;
wire eval_clock_enable = counter[0] & !counter[1] & step_eval & !reset;
+ wire writer_clock_enable = counter[0] & counter[1] & writer_active;
always @ (posedge clk)
counter <= counter + 1;
+ wire [12:0] P;
wire [15:0] E1;
wire [15:0] E2;
wire [3:0] gcop;
wire reader_active;
wire ram_we = reader_active ? reader_ram_we : gc_ram_we;
- wire [12:0] ram_addr = reader_active ? reader_ram_addr : writer_clock_enable ? writer_ram_addr : gc_ram_addr;
+ wire [12:0] ram_addr = reader_active ? reader_ram_addr : writer_active ? writer_ram_addr : gc_ram_addr;
wire [15:0] ram_di = reader_active ? reader_ram_di : gc_ram_di;
wire [15:0] ram_do;
- reg writer_clock_enable = 0;
wire writer_finished;
- reg will_stop_writer = 0;
reg writer_started = 0;
+ reg writer_active = 0;
- GCRAM gcram (.clk(clk), .we(ram_we), .addr(ram_addr), .di(ram_di), .do(ram_do), .result(result));
+ GCRAM gcram (.clk(clk), .we(ram_we), .addr(ram_addr), .di(ram_di), .do(ram_do));
- GC gc (.clk(clk), .rst(reset), .clk_enable(gc_clock_enable), .Ein(E1), .Eout(E2), .gcop(gcop), .ostate(gostate), .step_eval(step_eval), .conn_ea(conn_ea), .conn_et(conn_et), .ram_we(gc_ram_we), .ram_addr(gc_ram_addr), .ram_di(gc_ram_di), .ram_do(ram_do));
+ GC gc (.clk(clk), .rst(reset), .clk_enable(gc_clock_enable), .Ein(E1), .Eout(E2), .gcop(gcop), .ostate(gostate), .step_eval(step_eval), .conn_ea(conn_ea), .conn_et(conn_et), .ram_we(gc_ram_we), .ram_addr(gc_ram_addr), .ram_di(gc_ram_di), .ram_do(ram_do), .Pout(P));
EVAL eval (.clk(clk), .rst(reset), .clk_enable(eval_clock_enable), .Ein(E2), .Eout(E1), .gcop(gcop), .ostate(eostate), .conn_ea(conn_ea), .conn_et(conn_et));
READER reader (.clk(clk), .clk_enable(!initial_reset), .uart_rx_byte(uart_rx_byte), .uart_rx_signal(uart_rx_signal), .uart_is_receiving(uart_is_receiving), .active(reader_active), .ram_we(reader_ram_we), .ram_addr(reader_ram_addr), .ram_di(reader_ram_di));
- WRITER writer (.clk(clk), .clk_enable(writer_clock_enable), .uart_tx_byte(uart_tx_byte), .uart_tx_signal(uart_tx_signal), .uart_is_transmitting(uart_is_transmitting), .finished(writer_finished), .result(result));
+ WRITER writer (.clk(clk), .clk_enable(writer_clock_enable), .uart_tx_byte(uart_tx_byte), .uart_tx_signal(uart_tx_signal), .uart_is_transmitting(uart_is_transmitting), .finished(writer_finished), .ram_addr(writer_ram_addr), .ram_do(ram_do), .P(P));
// UART outputs
wire uart_rx_signal;
always @ (posedge clk) begin
if(writer_finished)
- will_stop_writer <= 1;
- if(will_stop_writer)
- writer_clock_enable <= 0;
+ writer_active <= 0;
if(reader_active) begin
writer_started <= 0;
- will_stop_writer <= 0;
end else if(eostate == 5'd7 && !writer_started) begin
writer_started <= 1;
- writer_clock_enable <= 1;
+ writer_active <= 1;
end
end
- // 300 baud uart
+ // 4800 baud uart
uart #(.CLOCK_DIVIDE(`UART_DIVIDE)) uart (.clk(clk), .rx(uart_rx), .tx(uart_tx), .transmit(uart_tx_signal), .tx_byte(uart_tx_byte), .received(uart_rx_signal), .rx_byte(uart_rx_byte), .is_receiving(uart_is_receiving), .is_transmitting(uart_is_transmitting), .recv_error (uart_rx_error));
// Assign the outputs
assign led[0] = eval_clock_enable;
assign led[1] = uart_is_transmitting;
assign led[2] = uart_is_receiving;
- assign led[3] = writer_clock_enable;
+ assign led[4] = !reset;
endmodule
module READER (input clk, input clk_enable, input [7:0] uart_rx_byte, input uart_rx_signal, input uart_is_receiving, output reg active, output reg ram_we, output [12:0] ram_addr, output reg [15:0] ram_di);
reg [1:0] state = `STATE_IDLE;
- reg [12:0] bytes_left = 0;
+ reg [12:0] words_left = 0;
reg [12:0] current_index = 0;
assign ram_addr = current_index;
case(state)
`STATE_IDLE: begin
if(uart_rx_signal) begin
- bytes_left[12:8] <= uart_rx_byte[4:0];
- bytes_left[7:0] <= 0;
+ words_left[12:8] <= uart_rx_byte[4:0];
+ words_left[7:0] <= 0;
current_index <= -1;
active <= 1;
state <= `STATE_LENGTH;
`STATE_LENGTH: begin
if(uart_rx_signal) begin
- bytes_left[7:0] <= uart_rx_byte;
+ words_left[7:0] <= uart_rx_byte;
state <= `STATE_READ1;
end
end
if(uart_rx_signal) begin
ram_di[15:8] <= uart_rx_byte;
current_index <= current_index + 1;
- bytes_left <= bytes_left - 1;
+ words_left <= words_left - 1;
state <= `STATE_READ2;
end
end
if(uart_rx_signal) begin
ram_di[7:0] <= uart_rx_byte;
ram_we <= 1;
- state <= |bytes_left ? `STATE_READ1 : `STATE_IDLE;
+ state <= |words_left ? `STATE_READ1 : `STATE_IDLE;
end
end
endcase
-`define STATE_WRITE_TYPE 3'd0
-`define STATE_WRITE1 3'd1
-`define STATE_WRITE2 3'd2
-`define STATE_WRITE3 3'd3
-`define STATE_WRITE4 3'd4
+`define STATE_START 2'b00
+`define STATE_WRITE1 2'b01
+`define STATE_WRITE2 2'b10
+`define STATE_INCREMENT 2'b11
-module WRITER (input clk, input clk_enable, output [7:0] uart_tx_byte, output reg uart_tx_signal = 0, input uart_is_transmitting, output reg finished = 0, input [15:0] result);
- reg [2:0] state = `STATE_WRITE_TYPE;
- reg [3:0] tx_hex = 0;
+module WRITER (input clk, input clk_enable, output reg [7:0] uart_tx_byte, output reg uart_tx_signal = 0, input uart_is_transmitting, output reg finished = 0, output [12:0] ram_addr, input [15:0] ram_do, input [12:0] P);
+ reg [1:0] state = `STATE_START;
- hex_to_ascii h2a (.hex(tx_hex), .ascii(uart_tx_byte));
+ reg [12:0] current_index;
+ reg [12:0] freeptr;
+
+ assign ram_addr = current_index;
always @ (posedge clk)
if (clk_enable) begin
uart_tx_signal <= 0;
case(state)
- `STATE_WRITE_TYPE: begin
+ `STATE_START: begin
finished <= 0;
- if(!uart_is_transmitting && !uart_tx_signal) begin
- uart_tx_signal <= 1;
- tx_hex <= {1'b0, result[15:13]};
- state <= `STATE_WRITE1;
- end
+ current_index <= 4;
+ freeptr <= P;
+ state <= `STATE_WRITE1;
end
`STATE_WRITE1: begin
if(!uart_is_transmitting && !uart_tx_signal) begin
uart_tx_signal <= 1;
- tx_hex <= {3'b0, result[12]};
+ uart_tx_byte <= ram_do[15:8];
state <= `STATE_WRITE2;
end
end
`STATE_WRITE2: begin
if(!uart_is_transmitting && !uart_tx_signal) begin
uart_tx_signal <= 1;
- tx_hex <= result[11:8];
- state <= `STATE_WRITE3;
+ uart_tx_byte <= ram_do[7:0];
+ state <= `STATE_INCREMENT;
end
end
- `STATE_WRITE3: begin
- if(!uart_is_transmitting && !uart_tx_signal) begin
- uart_tx_signal <= 1;
- tx_hex <= result[7:4];
- state <= `STATE_WRITE4;
- end
- end
-
- `STATE_WRITE4: begin
- if(!uart_is_transmitting && !uart_tx_signal) begin
- uart_tx_signal <= 1;
- tx_hex <= result[3:0];
+ `STATE_INCREMENT: begin
+ current_index <= current_index + 1;
+ if(current_index >= freeptr) begin
finished <= 1;
- state <= `STATE_WRITE_TYPE;
+ state <= `STATE_START;
+ end else begin
+ state <= `STATE_WRITE1;
end
end
- endcase
+ endcase // case (state)
end
endmodule
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